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  Subjects -> CHEMISTRY (Total: 849 journals)
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    - CHEMISTRY (598 journals)
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CHEMISTRY (598 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 32)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 17)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 227)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 53)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 14)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Nanoparticles     Open Access   (Followers: 14)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 26)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Hybrid Journal   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 158)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 208)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 1)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 3)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 14)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 3)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 283)
Biochemistry Insights     Open Access   (Followers: 5)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 108)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 93)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 67)
Catalysis for Sustainable Energy     Open Access   (Followers: 6)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 7)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 12)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 170)
Chemical Science     Open Access   (Followers: 21)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 55)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 25)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 144)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 226)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography Research International     Open Access   (Followers: 7)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 3)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access  
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 11)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 56)
Dalton Transactions     Full-text available via subscription   (Followers: 20)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 9)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)

        1 2 3 | Last

Journal Cover Applied Organometallic Chemistry
  [SJR: 0.632]   [H-I: 58]   [7 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0268-2605 - ISSN (Online) 1099-0739
   Published by John Wiley and Sons Homepage  [1576 journals]
  • A ferrocene-containing porous organic polymer linked by tetrahedral
           silicon-centered units for gas sorption
    • Authors: Qingyu Ma; Yipeng Qi, Jianquan Li, Weiguo Wang, Xuejiao Sun
      Abstract: A novel ferrocene-containing porous organic polymer (FPOP) has been prepared by Sonogashira-Hagihara coupling reaction of 1,1′-dibromoferrocene and tetrakis(4-ethynylphenyl)silane. Compared with other polymers, the resulting polymer possesses excellent thermal stability with the decomposition temperature of 415°C and high porosity with Brunauer–Emmett–Teller (BET) surface area of 542 m2 g−1 as measured by nitrogen adsorption-desoprtion isotherm at 77 K. For applications, it shows moderate carbon dioxide uptakes of up to 1.42 mmol g−1 (6.26 wt%) at 273 K/1.0 bar and 0.82 mmol g−1 (3.62 wt%) at 298 K/1.0 bar, and hydrogen capacity of up to 0.45 mmol g−1 (0.91 wt%) at 77 K/1.0 bar, indicating that FPOP might be utilized as a promising candidate for storing carbon dioxide and hydrogen. Although FPOP possesses lower porosity than many porous polymers, the gas capacities are higher or comparable to them, thereby revealing that the incorporation of ferrocene units into the network is an effective strategy to enhance the affinity between the framework and gas.A novel ferrocene-containing porous organic polymer (FPOP) constructed from 1,1′-dibromoferrocene and tetrakis(4-ethynylphenyl)silane exhibits excellent thermal stability, high porosity and can be utilized as a promising candidate for storing CO2 and H2.
      PubDate: 2017-07-27T01:56:27.836705-05:
      DOI: 10.1002/aoc.3935
       
  • 2-Arylation/alkylation of benzothiazoles using superparamagneticgraphene
           oxide-Fe3O4 hybrid material as a heterogeneous catalystwith diisopropyl
           azodicarboxylate (DIAD) as an oxidant
    • Authors: Dariush Khalili; Elham Etemadi-Davan, Ali Reza Banazadeh
      Abstract: In this report, we introduced Graphene oxide-iron oxide (GO-Fe3O4) nanocomposites as a heterogeneous catalyst for arylation/alkylation of benzothiazoles with aldehydes and benzylic alcohols in the presence of diisopropyl azodicarboxylate (DIAD) as an oxidant which exclusively produced 2-aryl (alkyl)-1H–benzothizoles in moderate to excellent yields. The absence of precious metals and toxic solvent, easy product isolation, and recyclability of the GO-Fe3O4 with no loss of activity are notable advantages of this method.We introduced Graphene oxide-iron oxide (GO-Fe3O4) nanocomposites as a heterogeneous catalyst for arylation/alkylation of benzothiazoles with aldehydes and benzylic alcohols in the presence of diisopropyl azodicarboxylate (DIAD) as an oxidant which exclusively produced 2-aryl (alkyl)-1H–benzothizoles in moderate to excellent yields.
      PubDate: 2017-07-27T01:55:48.269882-05:
      DOI: 10.1002/aoc.3971
       
  • Cross-coupling reactions using porous multipod Cu2O microcrystals as
           recoverable catalyst in aqueous media
    • Authors: Lin Tang; Chaoting Wu, Qiyan Hu, Qian Li, Wu Zhang
      Abstract: Porous multipod Cu2O microcrystals were found to be an efficient, highly recyclable and eco-friendly catalyst for the cross-coupling reactions of aryl halides and terminal alkynes with high yields in aqueous media. Noteworthy, the Cu2O catalyst can be reused for several times without significant decrease in catalytic activity.Porous multipod Cu2O microcrystals were found to be an efficient, highly recyclable and eco-friendly catalyst for the cross-coupling reactions of aryl halides and terminal alkynes with high yields in aqueous media.
      PubDate: 2017-07-27T01:50:45.257401-05:
      DOI: 10.1002/aoc.3980
       
  • CuO nanoparticles supported on three-dimensional nitrogen-doped graphene
           
    • Authors: Seyed Ghorban Hosseini; Zahra Khodadadipoor, Mojtaba Mahyari
      Abstract: In the present work, CuO nanoparticles grown on three-dimensional nitrogen-doped graphene-based frameworks (CuO@3D-(N)GFs) were synthesized using a two-step method. After the synthesis of three-dimensional nitrogen-doped graphene, CuO nanoparticles were deposited on it, by adding cupric acetate followed by thermal treatment. Different analysis methods were used to characterize the products. The as-prepared nanocomposite was used as a promising catalyst for thermal decomposition of ammonium perchlorate (AP) as one of the most common oxidizer in composite propellants. Differential scanning calorimetry (DSC) and thermogravimetry analysis (TGA) techniques were used to investigate the thermal decomposition of ammonium perchlorate. According to the DSC/TGA, high temperature decomposition of AP decreased to 111 °C in the presence of 4% CuO@3D-(N)GFs and the total heat release (ΔH) from decomposition of AP increased to 1893 J g−1 which is much more than 590 J g−1 for pure AP.CuO nanoparticles grown on three-dimensional nitrogen-doped graphene based-frameworks (CuONPs@3D-(N)GFs) were found to be an efficient stable catalyst for the thermal decomposition of ammonium perchlorate.
      PubDate: 2017-07-27T01:45:50.43001-05:0
      DOI: 10.1002/aoc.3959
       
  • Graphene-mesoporous anatase TiO2 nanocomposite: A highly efficient and
           recyclable heterogeneous catalyst for one-pot multicomponent synthesis of
           benzodiazepine derivatives
    • Authors: Mohd Shoeb; Mohammad Mobin, Abad Ali, Shamsuz Zaman, Alim H. Naqvi
      Abstract: The potential to bias chemical reaction pathways is a significant goal for physicists and material researchers to design revolutionary materials. Recently, two-dimensional materials have appeared as a promising candidate for exploring novel catalyst activity in organic reaction. In this context, herein we report an easy and efficient synthesis of substituted benzodiazepines in high yields through the graphene-based mesoporous TiO2 nanocomposite (Gr@TiO2 NCs) catalyst. To validate the merits of the Gr@TiO2 NCs as a catalyst, we have also designed TiO2 nanoparticle (NPs) under similar conditions. Successful comprehension realization of Gr@TiO2 NCs and TiO2 NPs were concluded from the XRD, SEM, HR-TEM, EDS elemental mapping, FT-IR, Raman, UV–Vis and TGA analysis. Gr@TiO2 NCs has the propitious catalyst performance (~98%) over the TiO2 NPs (~77%), which could be scrutinized in terms of graphene support toward the TiO2 NPs and enable the large contact area between graphene and TiO2 NPs. Incorporated graphene maintaining TiO2 as a catalytically active and attracting electron to site isolation, as well as protecting TiO2 from oxidative degradation during the reaction. Moreover, the role of graphene is suggested to prolonged reaction duration, yield and unaltered throughout the reaction because of the π-π interaction between graphene and TiO2 NPs. Additionally, the catalyst is recycled by filtration and reprocessed six times without having a significant loss in its catalytic activity.We have successfully synthesized graphene bonded and mesoporous anatase TiO2 NPs through an ex-situ hybridization strategy. Gr@TiO2 NCs play a role in the reaction mechanism for coupling of o-phenylenediamine, dimedone, and aldehydes so as to synthesize benzodiazepine derivatives.
      PubDate: 2017-07-27T01:40:51.832524-05:
      DOI: 10.1002/aoc.3961
       
  • Synthesis of graphene oxide supported copper–cobalt ferrite material
           functionalized by arginine amino acid as a new high–performance catalyst
           
    • Authors: Rahim Ghadari; Hassan Namazi, Mohammad Aghazadeh
      Abstract: A novel Cu0.5Co0.5Fe2O4@Arg–GO catalytic system was successfully prepared by immobilization of copper substituted cobalt ferrite nanoparticles on arginine–grafted graphene oxide nanosheets, in which ferrite moiety acts as an oxidation catalyst and arginine has the role of base catalyst. Also, arginine amino acid was used to modify the surface of graphene oxide nanosheets which the prepared support can improve dispersion and uniform loading of nanoparticles. The prepared nanocomposite was characterized by flame atomic absorption spectroscopy (FAAS), inductively coupled plasma optical emission spectrometer (ICP–OES), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT–IR), ultraviolet–visible spectroscopy (UV–vis), Raman spectroscopy, thermogravimetric analysis (TGA), x–ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analysis. The prepared Cu0.5Co0.5Fe2O4@Arg–GO nanocomposite was used as an efficient catalyst for one–pot tandem oxidative synthesis of 2–phenylbenzimidazole derivatives in good yields.Arginine amino acid was attached to the surface of graphene oxide nanosheets to produce a green support for immobilization of copper substituted cobalt ferrite nanoparticles. The prepared catalyst was used for the one-pot tandem oxidative cyclization of primary alcohols with o-phenylenediamines to produce benzimidazoles under aerobic oxidation conditions, with efficient activity and reusability.
      PubDate: 2017-07-27T01:35:51.360482-05:
      DOI: 10.1002/aoc.3965
       
  • Green route for selective gram-scale oxidation of sulfides using
           tungstate/triazine-based ionic liquid immobilized on magnetic
           nanoparticles as a phase-transfer heterogeneous catalyst
    • Authors: Seyed Hassan Hosseini; Maryam Tavakolizadeh, Nasrin Zohreh, Rouhollah Soleyman
      Abstract: Tungstate ions were successfully loaded onto triazine-based ionic liquid-functionalized magnetic nanoparticles through an anion exchange process. The use of triazine core for creating ionic liquid led to the immobilization of high amounts of WO42−. The resulting catalyst showed high activity and selectivity in the oxidation of sulfides to sulfoxides with H2O2 as a green oxidant at room temperature. In addition, due to the presence of ammonium groups in the catalyst structure, water dispersibility of the catalyst was increased. More important, the catalyst was magnetically recovered and reused for up to six runs without any marked decrease of activity and selectivity. Finally, easy gram-scale oxidation of methylphenyl sulfide as well as fast separation of catalyst and product makes the protocol economical and industrially applicable.Simple preparation of tungstate/triazine-based ionic liquid immobilized on magnetic nanoparticles is provided as a phase-transfer catalyst for gram-scale selective oxidation of sulfides using 0.4 mol% catalyst loading. H2O and H2O2 used as green solvent and oxidant. Reusability of catalyst is up to 6 subsequent runs without significant loss of activity or leaching.
      PubDate: 2017-07-27T01:31:35.686901-05:
      DOI: 10.1002/aoc.3953
       
  • Molecular structure, molecular docking, thermal, spectroscopic and
           biological activity studies of bis-Schiff base ligand and its metal
           complexes
    • Authors: Ehab M. Zayed; Ahmed M.M. Hindy, Gehad G. Mohamed
      Abstract: Coordination compounds of Fe(III), Zn(II), Ni(II), Co(II), Cu(II), Cd(II) and Mn(II) ions were synthesized from the ligand [4,4′-((((ethane-1,2-diylbis(oxy))bis(2,1-phenylene))bis(methanylylidene))bis(azanylylidene))diphenol]ethane (H2L) derived from the condensation of bisaldehyde and 4-aminophenol. Microanalysis, magnetic susceptibility, infrared, 1H NMR and mass spectroscopies, molar conductance, X ray powder diffraction and thermal analysis were used to confirm the structure of the synthesized chelates. According to the data obtained, the composition of the 1:1 metal ion–bis-Schiff base ligand was found to be [M(H2L)(H2O)2]Cln (M = Zn(II), Ni(II), Co(II), Cu(II), Cd(II) and Mn(II), n = 2; Fe(III), n = 3). Magnetic susceptibility measurements and reflectance spectra suggested an octahedral geometry for the complexes. Central metals ions and bis-Schiff base coordinated together via O2 and N2 donor sites which as evident from infrared spectra. The Gaussian09 program was applied to optimize the structural formula for the investigated Schiff base ligand. The energy gaps and other important theoretical parameters were calculated applying the DFT/B3LYP method. Molecular docking using AutoDock tools was utilized to explain the experimental behaviour of the Schiff base ligand towards proteins of Bacillus subtilis (5 h67), Escherichia coli (3 t88), Proteus vulgaris (5i39) and Staphylococcus aureus (3ty7) microorganisms through theoretical calculations. The docked protein receptors were investigated and the energies of hydrogen bonding were calculated. These complexes were then subjected to in vitro antibacterial studies against several organisms, both Gram negative (P. vulgaris and E. coli) and Gram positive (S. pyogones and B. subtilis). The ligand and metal complexes exhibited good microbial activity against the Gram-positive and Gram-negative bacteria.Optimized structure, and HOMO and LUMO patterns of bis-Schiff base ligand.
      PubDate: 2017-07-27T01:31:19.896239-05:
      DOI: 10.1002/aoc.3952
       
  • Hydrogenation of nitroarenes catalyzed by a dipalladium complex
    • Authors: Ming-Uei Hung; Shu-Ting Yang, Mani Ramanathan, Shiuh-Tzung Liu
      Abstract: A dipalladium complex [Pd2(L)Cl2](PF6)2 (2), via the substitution of (PhCN)2PdCl2 with 5-phenyl-2,8-bis(6′-bipyridinyl)-1,9,10-anthyridine (L) followed by the anion exchange, was found to be a good pre-catalyst for the reduction of nitroarenes to yield the corresponding anilines under atmospheric pressure of hydrogen in methanol. This method provides a straightforward access to a diverse array of functionalized anilines, exhibiting a possible application in synthetic chemistry. The catalytic activity of this complex is enhanced by the di-metallic system via the synergistic effect.A dipalladium complex resulting from complexation of [Pd(CH3CN)2Cl2] with 5-phenyl-2,8-bis(6′-bipyridinyl)-1,9,10-anthyridine has found to be a good catalyst for reduction of nitroarenes into the corresponding anilines under atmospheric pressure of hydrogen, presumably due to the cooperative interaction between metal ions.
      PubDate: 2017-07-27T01:26:13.296188-05:
      DOI: 10.1002/aoc.3976
       
  • Fe3O4@S-ABENZ@VO: Magnetically separable nanocatalyst for the efficient,
           
    • Authors: Somaieh Rezaei; Arash Ghorbani-Choghamarani, Rashid Badri, Ahmad Nikseresht
      Abstract: Oxovanadium(IV) immobilized on Fe3O4@S-ABEN is reported as a highly efficient nanocatalyst for the oxidation of sulfides and oxidative coupling of thiols (using H2O2 as green oxidant), the products of which are obtained in high to excellent yields. The products can be separated by a simple extraction with organic solvent and the catalyst is highly efficient, especially in terms of selectivity of desired product. The catalytic system can be recycled and reused without significant loss of catalytic activity.Fe3O4@S-ABEN has been prepared as new nanocatalyst and characterized by different techniques. This nano structural compound applied for the oxidation of sulfides and oxidative coupling of thiols using H2O2, as green oxidant.
      PubDate: 2017-07-27T01:22:01.637843-05:
      DOI: 10.1002/aoc.3948
       
  • Copper(I) complex covalently anchored on graphene oxide as an efficient
           and recyclable catalyst for Sonogashira reaction
    • Authors: Roghayeh Hashemi Fath; S. Jafar Hoseini
      Abstract: In this study, the organosilane-functionalized graphene oxide as a stabilizer was prepared by a facile one-step silylation approach. [Cu(PPh3)3Cl] complex was successfully immobilized onto the graphene oxide surface through coordination interaction with organosilane ligand spacers. The supported catalyst showed enhanced catalytic performance toward Sonogashira reaction of aryl halides with phenylacetylene in water solvent compared with the homogeneous analogues, and it could be readily recycled and reused several times without discernible loss of its activity.Copper(I) complex was covalently anchored onto the graphene oxide surface through coordination interaction by employing (3-aminopropyl)triethoxysilane ligand spacers and were used as efficient catalyst in the Sonogashira reaction.
      PubDate: 2017-07-21T06:01:09.871242-05:
      DOI: 10.1002/aoc.3964
       
  • A comparative study on the catalytic performance of heme and non-heme
           catalysts: Metal porphyrins versus metal Schiff bases
    • Authors: Atefeh Talaeizadeh; Mahdi Tofighi, Saeed Zakavi
      Abstract: Catalytic activity and oxidative stability of a series of iron and manganese porphyrins with 2-chlorophenyl, phenyl and 4-methoxyphenyl at the meso positions and metallosalens (Mn- and Fe-salens) including N,N′-bis(salicylidene)ethylenediamine, N,N′-bis(5- chlorosalicylidene)ethylenediamine and N,N′-bis(2,4-dihydroxysalicylidene)ethylenediamine for the oxidation of olefins with tetra-n-butylammonium periodate (TBAP) and tetra-n-butyl-ammonium Oxone (TBAO) have been investigated and compared. Although the metalloporphyrins showed an increased catalytic activity relative to the Schiff base complexes, the former provided no significant catalytic advantage over the latter. Also, a comparable or slightly higher oxidative stability was observed for the Schiff base complexes under the reaction conditions. Furthermore, in spite of large difference between the oxidizing ability of TBAO and TBAP, similar patterns were observed for the order of catalytic activity and oxidative stability of the used heme and non-heme catalysts. The introduction of a methyl group at the ɑ position of styrene led to an increase in its reactivity, indicating the dominance of electronic effects over the steric ones in these catalytic systems.The oxidation of olefins with tetra-butylammonium periodate and Oxone was conducted in the presence of the manganese and iron complexes of a series of porphyrins and Schiff bases to compare their relative catalytic activity and oxidative stability.
      PubDate: 2017-07-21T06:00:48.602452-05:
      DOI: 10.1002/aoc.3967
       
  • Amino acid ionic liquid-based titanomagnetite nanoparticles: An efficient
           and green nanocatalyst for the synthesis of
           1,4-dihydropyrano[2,3-c]pyrazoles
    • Authors: Davood Azarifar; Omolbanin Badalkhani, Younes Abbasi
      Abstract: The amino acid ionic liquid tetrabutylammonium asparaginate (TBAAsp) was immobilized on titanomagnetite (Fe3−xTixO4) nanoparticles in a facile one-pot process using an organosilane compound (TMSP) as spacer. The modified Fe3−xTixO4@TMSP@TBAAsp magnetic nanoparticles were characterized using Fourier transform spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, vibrating sample magnetometry and thermogravimetric analysis. The resulting analytical data clearly verified the successful immobilization of the ionic liquid on the magnetic substrate. The magnetic ionic liquid-based nanoparticles exhibited high catalytic activity in the synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives via a one-pot three-component reaction under mild reaction conditions. The catalyst was easily recycled and reused for at least six runs without any considerable loss of activity.Tetrabutylammonium asparaginate (TBAAsp) ionic liquid-functionalized titanomagnetite (Fe3−xTixO4@TMSP@TBAAsp) nanoparticles as an efficient and recyclable heterogeneous nanocatalyst were synthesized via a simple procedure for the first time. The prepared catalyst was fully characterized. Catalytic activity of this green catalyst was explored for one-pot three-component synthesis of dihydropyrano[2,3-c]pyrazoles under solvent-free conditions.
      PubDate: 2017-07-21T05:56:38.527075-05:
      DOI: 10.1002/aoc.3949
       
  • Synthesis and spectroscopic characterizations of Cu(II) complexes with
           novel 15-membered N4 macrocyclic ligand and their utility to obtain CuO
           nanostructures for efficient degradation of dyes
    • Authors: Abdel Majid A. Adam; A. Alhadhrami, Hosam A. Saad, Moamen S. Refat
      Abstract: This paper describes synthesis, characterization and application of a series of Cu(II) complexes with a novel 3-thioxo-[1,2,4,5]tetrazocane-6,8-dione (N4) macrocyclic ligand. The complexes were characterized by physicochemical and spectroscopic techniques, such as UV–visible and IR spectroscopies, molar conductance, magnetic susceptibility measurements, and elemental analysis. The data suggest that the mononuclear Cu(II) complexes have a metal-to-ligand mole ratio of 1:1 and that the Cu(II) ions are coordinated with the four nitrogen atoms inside the N4 macrocyclic ring. The experimental anisotropic g-values indicate that the chloro, nitrato, acetate, and perchlorato complexes have six-coordinate distorted octahedral behavior, whereas the sulfato complex has five-coordinate square-pyramidal geometry. A simple and nontoxic method for preparation of CuO nanoparticles based upon the thermal decomposition of the synthesized Cu(II) complexes has been explored. Finally, the degradation of Rhodamine 6G dye by the catalytic performance of nano-sized CuO material has been evaluated.A novel 15-membered N4 macrocyclic ligand was prepared. The direct thermal decomposition of the nitrato Cu(II) complex with this ligand leads to a CuO material with an unusual ice shovel-like-shaped morphology involving a highly organized nanoscale structure.
      PubDate: 2017-07-21T05:56:18.932548-05:
      DOI: 10.1002/aoc.3950
       
  • Phosphated tungstate: An efficient new solid phosphoric acid catalyst for
           the synthesis of heterocyclic nitrones
    • Authors: Alireza Banan; Hassan Valizadeh, Akbar Heydari, Abolghasem Moghimi
      Abstract: Phosphated tungstate as a new, reusable and efficient solid phosphoric acid catalyst was synthesized and used to promote the reaction of diaminoglyoxime with various aromatic aldehydes. The prepared phosphated tungstate was characterized using various techniques including X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and thermal analysis. A wide variety of heterocyclic nitrones were obtained under mild reaction conditions and in high yields by using the prepared catalyst.Phosphated tungstate as a new, reusable and efficient solid phosphoric acid catalyst was synthesized, and to promote the reaction of diaminoglyoxime with various aromatic aldehydes. A wide variety of heterocyclic nitrones were obtained under mild reaction conditions and in high yields.
      PubDate: 2017-07-21T05:50:45.472423-05:
      DOI: 10.1002/aoc.3944
       
  • Sulfuric acid heterogenized on magnetic Fe3O4 nanoparticles: A new and
           efficient magnetically reusable catalyst for condensation reactions
    • Authors: Lotfi Shiri; Setare Zarei, Mosstafa Kazemi, Davood Sheikh
      Abstract: Immobilized sulfuric acid on magnetic Fe3O4 nanoparticles (Fe3O4 MNPs-OSO3H) as a new solid acid nanocomposite was successfully synthesized and its catalytic activity in a series of condensation reactions was studied. High catalytic activity, simple separation from reaction mixture by an external magnet and good reusability are several eco-friendly advantages of this catalytic system. It is noteworthy that this catalytic system is applicable to a wide range of spectrum of aromatic aldehydes, and the desired products were obtained in good to excellent yields under mild conditions. The use of ecofriendly solvents makes also this synthetic protocol ideal and fascinating from the environmental point of view.Sulfuric acid heterogenized on magnetic Fe3O4 nanoparticles (Fe3O4 MNPs-OSO3H) was found to be a novel, eco-friendly and versatile magnetically recoverable catalyst for the condensation reactions.
      PubDate: 2017-07-21T05:45:50.423418-05:
      DOI: 10.1002/aoc.3938
       
  • Anti-proliferative activity of newly synthesized cd(II), cu(II),
           Zn(II),Ni(II), co(II), VO(II), and Mn(II) complexes of
           2-((4,9-dimethoxy-5-oxo-5H-furo[3,2-g]chromen-6-yl)methylene)
           hydrazinecarbothioamide on three human cancer cells
    • Authors: Mohamad M.E. Shakdofa; Hanan A. Mousa, Ahmed M.A. Elseidy, Ammar A. Labib, Mamdouh M. Ali, Amira S. Abd-El-All
      Abstract: Thiosemicarbazone ligand, 2-((4,9-dimethoxy-5-oxo-5H-furo[3,2-g]chromen-6-yl)methylene) hydrazinecarbothioamide and its Cd(II), Cu(II), Zn(II), Ni(II), Co(II), VO(II), and Mn(II) complexes have been prepared and characterized by various spectroscopic and analytical techniques. Complexes molar conductance measurements displayed that all complexes (2–8) are non-electrolyte. With general composition [M(H3L)(CH3COO)2H2O].nH2O, where M = Cd(II), Cu(II), Zn(II), Ni(II), Co(II) and Mn(II) while complex (8) has [VO(H3L)(SO4)H2O].2H2O formula. Based on analytical and spectral measurements, the octahedral or distorted octahedral geometries suggested for complexes. Ligand and complexes anti-proliferative activities were assessed against three various human tumor cell lines including breast cancer (MCF-7), liver cancer (HepG2) and lung cancer (A549) using SRB fluorometric assay and cis-platin as positive control. The anti-proliferative activity result indicated that the ligand and its complexes have considerable anti-proliferative activity analogous to that of ordinarily utilized anti-cancer drug (cis-platin). They do their anti-cancer activities by modifying free radical's generation via raising the superoxide dismutase activity and depletion of intracellular reduced glutathione level, catalase, glutathione peroxidase activities, escorted by highly generation of hydrogen peroxide, nitric oxide and other free radicals leading to tumor cells death, as monitoring by decreasing the protein and nucleic acids synthesis.Cd(II), Cu(II), Zn(II), Ni(II), Co(II), VO(II), and Mn(II) complexes of 2-((4,9-dimethoxy-5-oxo-5H-furo[3,2-g]chromen-6-yl) methylene) hydrazinecarbothioamide have considerable anti-proliferative activity against human breast cancer (MCF-7); human liver cancer (HepG2) and human lung cancer (A549) analogous to the activity of ordinarily utilized anticancer drug (cisplatin).
      PubDate: 2017-07-21T05:40:25.436325-05:
      DOI: 10.1002/aoc.3936
       
  • Synthesis, characterization and computational study of CuI nanoparticles
           immobilized on modified poly (styrene-co-maleic anhydride) as a green,
           efficient and recyclable heterogeneous catalyst in the synthesis of
           1,4-disubstituted 1,2,3-triazoles via click reaction
    • Authors: Fatemeh Ebrahimpour-Malamir; Tayebeh Hosseinnejad, Razieh Mirsafaei, Majid M. Heravi
      Abstract: Poly (styrene-co-maleic anhydride) (SMA) was modified by reactionwith4-amino-2-methyl-10H-thiene [2,3-b][1,5]-benzodiazepine (ATD) hydrochloride, providing an imide with the appropriate sites for the coordination of Cu(I)ions. This modified SMA was reacted with CuI to obtain immobilized Cu(I) NPs. This Cu(I) NPs (CuI/SMI-TD) was fully characterized by conventional techniques such as FT-IR, NMR, SEM, TEM, EDAX and ICP-AES analysis. The SEM and TEM images clearly showed CuI NPs as spherical shapes and the size of particles is 30-60 nm. Moreover, a quantitative description for experimental features of CuI/SMI-TD was presented via computational assessment for the interactions between copper metal ions and coordination sites of SMI-TD ligand. The catalytic activity of this new catalyst was examined in the regioselective synthesis of 1,4-disubstituted-1,2,3 triazoles in a classical copper-catalyzed reaction a so-called click reaction. The catalyst showed highly efficient catalytic activity, excellent reusability, high yield and more importantly excellent, regioselectivity. The catalyst was recoverable through simple filtration and can be reused at least five times without significant loss of catalytic activity. The heterogeneous nature of the catalyst was confirmed based on the hot filtration test and ICP-AES analysis.A novel heterogeneous catalyst based on copper (I) supported on modified SMA has been synthesized and characterized. This catalyst exhibits excellent catalytic activities in synthesis of 1,4-disubstituted 1,2,3-triazoles via click reaction.
      PubDate: 2017-07-21T05:31:12.540269-05:
      DOI: 10.1002/aoc.3913
       
  • Three Arene-Ru(II) compounds of 2-halogen-5-aminopyridine: Synthesis,
           characterization, and cytotoxicity
    • Authors: Xiao-Wei Yan; Yong-Rong Xie, Zhi-Min Jin, Mao-Lin Hu, Liang-Pu Zhou
      Abstract: Three novel compounds, (η6-p-cymene)RuCl2(2-fluoro-5-aminopyridine) (compound 1), (η6-p-cymene)RuCl2(5-amino-2-chlorpyridine) (compound 2) and (η6-p-cymene)RuCl2(2-bromo- 5-aminopyridine) (compound 3), were synthesized and characterized. The compound 1 and 3 were determined by X-ray diffraction, showing a distorted piano-stool type of geometry with similar bond lengths and angles around the ruthenium. Compound 2 exhibited moderate in vitro activity against A549 and MCF-7 human cancer cells, the other two lower activities. The UV–vis and fluorescent absorption titrations showed that three compounds binded with CT-DNA in a minor groove. The intrinsic binding constants (Kb) were calculated to be 2.13(±0.03) × 105 M−1, 2.89(±0.03) × 105 M−1 and 2.45(±0.03) × 105 M−1 for compound 1, 2 and 3, respectively, by using UV–vis absorption titrations data. Among the three compound, the highest value of intrinsic binding constant of compound 2 was consistent with its highest cytoxicity against A549 and MCF-7 human cancer cells in vitro.Three novel compounds, (η6-p-cymene)RuCl2(2-X-5-aminopyridine) (X = F, Cl, Br), were synthesized and characterized. The X-ray diffraction revealed that the molecules containing substitutional F and Br atom showed a distorted piano-stool type of geometry. The UV-vis and fluorescent absorption titrations showed that three compounds binded with CT-DNA in a minor groove. The intrinsic binding constants (Kb) were 2.13(±0.03)×105 M−1, 2.89(±0.03) ×105 M−1 and 2.45(±0.03)×105 M−1 for compound containing substitutional F, Cl and Br atom, respectively. Among the three compounds, the highest value of intrinsic binding constant of compound containing substitutional Cl atom was consistent with its highest cytoxicity against A549 and MCF-7 human cancer cells in vitro.
      PubDate: 2017-07-20T03:32:37.218718-05:
      DOI: 10.1002/aoc.3923
       
  • An efficient synthesis and cytotoxic activity of
           2-(4-chlorophenyl)-1H–benzo[d]imidazole obtained using a magnetically
           recyclable Fe3O4 nanocatalyst-mediated white tea extract
    • Authors: Sara Shojaee; Mahnaz Mahdavi Shahri
      Abstract: A simple and efficient procedure has been developed for the synthesis of biologically relevant 2-substituted benzimidazoles through a one-pot condensation of o-phenylenediamines with aryl aldehydes catalysed by iron oxide magnetic nanoparticles (Fe3O4 MNPs) in short reaction times with excellent yields. In the present study, Fe3O4 MNPs synthesized in a green manner using aqueous extract of white tea (Camelia sinensis) (Wt-Fe3O4 MNPs) were applied as a magnetically separable heterogeneous nanocatalyst to synthesize 2-(4-chlorophenyl)-1H–benzo[d]imidazole which has potential application in pharmacology and biological systems. Fourier transform infrared and NMR spectroscopies were used to characterize the 2-(4-chlorophenyl)-1H–benzo[d]imidazole. In vitro cytotoxicity studies on MOLT-4 cells showed a dose-dependent toxicity with non-toxic effect of 2-(4-chlorophenyl)-1H–benzo[d]imidazole, up to a concentration of 0.147 µM. The green synthesized Wt-Fe3O4 MNPs as recyclable nanocatalyst could be used for further research on the synthesis of therapeutic materials, particularly in nanomedicine, to assist in the treatment of cancer.In this research, the green synthesized Fe3O4 MNPs using aqueous extract of white tea has been applied as magnetically separable heterogeneous nanocatalyst to synthesize 2-(4-Chlorophenyl)-1 H benzo [d] imidazole which has potential application in pharmacology and biological systems. The present study successfully demonstrated a simple, eco-friendly method for the imidaozol with significant potential anticancer properties.
      PubDate: 2017-07-20T03:32:05.501733-05:
      DOI: 10.1002/aoc.3934
       
  • Synthesis of ferrocene-modified poly(glycidyl methacrylate) and its
           burning rate catalytic property
    • Authors: Weidong Zhou; Li Wang, Haojie Yu, Xia Xia
      Abstract: A series of ferrocene-modified poly(glycidyl methacrylate) (PGMA-Fc) compounds were synthesized and applied as burning rate catalysts in simulative solid propellant to overcome migration problems. 1H NMR and Fourier transform infrared spectroscopies and gel permeation chromatography were used to characterize the synthesized polymers. Their electrochemical behavior was evaluated using cyclic voltammetry. Their catalytic performance for the decomposition of ammonium perchlorate (AP) was investigated using thermogravimetric analysis. Anti-migration studies were conducted in migration tubes under 50°C. The results show that PGMA-Fc has a good catalytic effect on lowering the thermal decomposition temperature of AP. Anti-migration studies show that PGMA-Fc has better anti-migration performance than ferrocene and catocene.A series of ferrocene-modified poly(glycidyl methacrylate) (PGMA-Fc) compounds were synthesized and applied as burning rate catalysts in simulative solid propellant to overcome migration problems. Anti-migration studies show that PGMA-Fc has a good catalytic effect on lowering the thermal decomposition temperature of AP and better anti-migration performance than ferrocene and catocene.
      PubDate: 2017-07-20T03:25:55.907416-05:
      DOI: 10.1002/aoc.3932
       
  • Synthesis and characterization of SnO2/(NH4)2-SnCl6 nanocomposites loaded
           on activated carbon and its application for adsorption of methylene Blue
           and Orange G
    • Authors: Samane Jalali; Mahmood Reza Rahimi, Mehrorang Ghaedi, Arash Asfaram, Alireza Goudarzi
      Abstract: The present study deals with the synthesis and characterization (FE-SEM, particle size distribution, XRD and point of zero charge) SnO2/(NH4)2-SnCl6 nanocomposites loaded on activated carbon (SnO2/(NH4)2-SnCl6-NCs-AC) and its subsequent application for the simultaneous removal of Methylene Blue (MB) and Orange G (OG) from aqueous solution. Response surface methodology (RSM) based on central composite design (CCD) give trend of influencing responses with respect to five parameters such as contact time (X1), OG concentration (X2), MB concentration (X3), adsorbent mass (X4) and pH (X5). In later stage following recognition of significant variables and interaction, quadratic model generated which are able to predict the dyes removal in different conditions. Justification and selection of significant terms was conducted based on analysis of variance and Fisher's F-test Optimal value of contact time, OG concentration, MB concentration, adsorbent mass and pH were set at 4.0 min, 10 mg l−1, 20 mg L−1, 0.015 g and 6.0, respectively, which lead to achievement of best experiment removal percentage of 97.0 and 99.5% OG and MB respectively, from their binary solutions. The whole experimental data follow pseudo-first-order and pseudo-second-order rate equations. The fitting experimental data to more available conventional model like Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models revel more ability of Langmuir model (with R2 > 0.997) for explanation of system in equilibrium. The adsorption efficiency remained high even after the five cycle of reuse (99.76% and 95.56% for MB and OG, respectively).The present study deals with the synthesis and characterization SnO2/(NH4)2-SnCl6 nanocomposites loaded on activated carbon (SnO2/(NH4)2-SnCl6-NCs-AC) and its subsequent application for the simultaneous removal of Methylene Blue and Orange G from aqueous solution.
      PubDate: 2017-07-20T03:21:46.129491-05:
      DOI: 10.1002/aoc.3903
       
  • Issue Information
    • Abstract: No abstract is available for this article.
      PubDate: 2017-07-19T03:57:19.798171-05:
      DOI: 10.1002/aoc.3619
       
  • Cover Image
    • Authors: Fayaz Ali Larik; Aamer Saeed, Tanzeela Abdul Fattah, Urooj Muqadar, Pervaiz Ali Channar
      Abstract: The cover image, by Fayaz Ali Larik et al., is based on the Review Article Recent advances in the synthesis, biological activities and various applications of ferrocene derivatives,
      DOI : 10.1002/aoc.3664.
      PubDate: 2017-07-19T03:57:16.876519-05:
       
  • Preparation of chitosan functionalized end-capped Ag-NPs and composited
           with Fe3O4-NPs: Controlled release to pH-responsive delivery of
           progesterone and antibacterial activity against pseudomonas aeruginosa
           (PAO-1)
    • Authors: Faezeh Pourebrahim; Mehrorang Ghaedi, Kheibar Dashtian, Shadi Kheirandish, Ramin Jannesar, Vahid Pezeshkpour
      Abstract: In this work, functionalized chitosan end-capped Ag nanoparticles (NPs) and composited with Fe3O4-NPs was prepared as pH-responsive controlled release carrier for gastric-specific drug delivery. The structure of prepared material was characterized by FE-SEM, XRD, EDS and FT-IR analysis. The loading behavior of the progesterone onto this novel material was studied in aqueous medium at 25°C and their release was followed spectrophotometrically at 37°C in seven different buffer solutions (pH 1.2, 2.2, 3.2, 4.2, 5.2, 6.2 and 7.2) to simulate intestine and gastric media which experimental results reveal more release rate in pH 1.2 (gastric medium) with respect to other buffers. This observation is attributed to dependency of the CS-IMBDO-Ag-Fe3O4-NPs and progesterone structure with buffer pH that candidate this new material as prospective pH-sensitive carrier for gastric-targeted drug delivery. On the other hand, the antibacterial properties of this material against gram-negative bacterium pseudomonas aeruginosa (PAO-1) in agar plates was studied and accordingly based on broth micro dilution the minimum bactericidal concentration (MBC) and minimum inhibitory concentration (MIC) with respect to standard CLSI in different concentrations of CS-IMBDO-Ag-Fe3O4-NPs was calculated. The results reveal that MIC and MBC values are 50 and 1250 μg/mL, respectively. In addition, extracts of Portulaca oleracea leaves was prepared and its antibacterial activity in single and binary system with CS-IMBDO-Ag-Fe3O4-NPs as synergies effect against PAO-1 was tested and results shown that these materials have significant synergistic effect for each other.Functionalized chitosan end-capped Ag nanoparticles (NPs) composited with Fe3O4-NPs was prepared and characterized by FE-SEM, EDS and FT-IR analysis. The loading behavior of the progesterone onto this novel material was studied in aqueous medium at 25 °C and their release was followed spectrophotometrically some different solutions (buffered at pH 1.2, 2.2, 3.2, 4.2, 5.2,6.2 and 7.2) to simulate intestine and gastric media. The release rate in pH 1.2 (gastric medium) buffer is higher than that other buffers. Also, we investigated the antibacterial properties of this material against gram-negative bacterium pseudomonas aeruginosa (PAO-1) in agar plates.
      PubDate: 2017-07-16T23:37:15.312583-05:
      DOI: 10.1002/aoc.3921
       
  • Copper nanoparticles incorporated on a mesoporous carbon nitride, an
           excellent catalyst in the Huisgen 1,3-dipolar cycloaddition and
           N-arylation of N-heterocycles
    • Authors: Siyavash Kazemi Movahed; Parinaz Salari, Melika Kasmaei, Mahsa Armaghan, Minoo Dabiri, Mostafa M. Amini
      Abstract: Cu nanoparticles with average particles size around 10 nm were incorporated on the surface of a mesoporous carbon nitride support. The XRD and N2 adsorption isotherms show that it maintains a hexagonal mesoporous structure with a high surface area (600.03 m2 g−1). The embedded Cu nanoparticles exhibit extremely high catalytic performance in two different kinds of organic reactions. The Huisgen 1,3-dipolar cycloaddition and N-arylation of N-heterocycles were all accomplished.Copper nanoparticles around 10 nm were incorporated on the surface of a mesoporous carbon nitride support. The Huisgen 1,3-dipolar cycloaddition and N-arylation of N-heterocycles were all successfully accomplished.
      PubDate: 2017-07-16T23:01:19.198276-05:
      DOI: 10.1002/aoc.3914
       
  • Structural studies and biological activity evaluation of Pd(II), Pt(II)
           and Ru(II) complexes containing N-phenyl, N`-(3-triazolyl)thiourea
    • Authors: Ahmed M. Mansour
      Abstract: [MCl(H2L)(OH2)]·1.5H2O (M = Pd(II) (1) and Pt(II) (2)) and [Ru(H2L)2(OH2)2]·3H2O (3) (H3L: N-phenyl, N`-(3-triazolyl)thiourea) were synthesized, characterized and tested for their antibacterial activities against Staphylococcus aureus and Escherichia coli bacteria. The thiourea derivative is coordinated to Mn+ ions as a mono-negatively N,S-bidentate ligand via the enolization of C = S group and triazole N center. The density functional theory calculations reveal that presence of a water molecule in a trans position to triazole ring increased the stability of d8 metal ions complexes via the formation of strong Cl…NH intramolecular H-bond. The cis-Ru(II)-isomer with two isoenergetically H2L− molecules are more stable than the trans-analog. Coordination of H3L to Ru(II) ion did not alter the toxicity of the free ligand, while the interaction with the d8 metal ions gave rise to inactive compounds.DFT calculations reveal that presence of H2O, in the coordination spheres of Pd(II) and Pt(II) complexes of the title ligand, in a trans-position to the triazole ligand with increase the stability via the formation of strong Cl…NH hydrogen bond. Alternatively, the cis-isomer of Ru(II) complex is more stable than the trans-analog. The ligand interacts with the metal ions via the enolization of NH-C = S- group and triazole nitrogen atom as evidenced by the analytical and spectral tools.
      PubDate: 2017-07-11T02:35:49.738992-05:
      DOI: 10.1002/aoc.3928
       
  • Synthesis of innovative biochemical active mixed ligand metal(II)
           complexes with thiazole containing Schiff base: In vitro antimicrobial
           profile
    • Authors: Natarajan Raman; Thiravidamani Chandrasekar, Ganesan Kumaravel, Liviu Mitu
      Abstract: An unique Schiff base ligand, formed by the condensation reaction of 2-aminobenzothiazole with curcumin and its Cu(II), Ni(II), Co(II) and Zn(II) complexes incorporating 2,2′-bipyridine as coligand were synthesised. They were characterized via analytical and spectroscopic methods. The complexes adopt square planar geometry. Their antimicrobial activity and photocatalytic efficiency on Congo red dye molecule were explored. It is found that all the complexes are antimicrobial active and show higher activity than the ligand. The nuclease activity of the above metal complexes was also assessed by absorption titration, fluorescence, viscosity and gel electrophoresis assay. The complexes bind CT DNA through intercalation mode. The data reveal that the above synthesised metal(II) complexes are found to be effective metallonucleases. The gel electrophoresis results exhibit that the metal complexes cleave pBR322 plasmid DNA in presence of hydrogen peroxide effectively compared to the ligand. The synthesised metallonucleases should lead to a new era for the logical sketch of dominant agents for probing and targeting nucleic acids. This exploration reveals that Cu(II) complex has a valued biological and photochemical profile.A few novel mixed ligand metal(II) complexes were synthesized by the condensation of curcumin based Schiff base with 2-aminobenzothiazole and 2,2'-bipryidine and characterized by spectral and analytical data. They are identified as strong metallointercalators, potent DNA unfolding agents and have better biological profile. The complexes were also subjected to photocatalytic activity and inferred as potential catalysts for the degradation of Cango red dye. Among the metal complexes copper(II) complex has deserving biochemical profile.
      PubDate: 2017-07-07T05:00:51.929107-05:
      DOI: 10.1002/aoc.3922
       
  • Diethyldisulfoammonium chlorometallates as heterogeneous Brønsted–Lewis
           acidic catalysts for one-pot synthesis of
           14-aryl-7-(N-phenyl)-14H-dibenzo[a,j]acridines
    • Authors: Arup Kumar Dutta; Pinky Gogoi, Ruli Borah
      Abstract: A new series of Brønsted–Lewis acidic diethyldisulfoammonium chlorometallates, [DEDSA][FeCl4] and [DEDSA]2[Zn2Cl6], were synthesized as solid materials from the reaction of [(Et)2N(SO3H)2][Cl] ionic liquid with transition metal chlorides (FeCl3 and ZnCl2) at 80 °C in neat condition for 2 h. The chlorometallates were fully characterized using various spectroscopic and analytical techniques such as Fourier transform infrared, UV–visible and Raman spectroscopies, powder X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray and thermogravimetric analyses, Hammett acidity and elemental analyses. Their catalytic activity was studied as reusable heterogeneous catalysts for the three-component synthesis of novel 14-aryl-7-(N-phenyl)-14H-dibenzo[a,j]acridines under solvent-free conditions at 100 °C.Two Brønsted-Lewis acidic solid diethyl-disulfoammonium chlorometallates [DEDSA][FeCl4] and [DEDSA]2[Zn2Cl6] were synthesized from the reaction of [(Et)2N(SO3H)2][Cl] ionic liquid with transition metal chlorides (FeCl3 and ZnCl2) at 80 °C and evaluated as reusable heterogeneous catalyst for preparation of novel 14-aryl-7-(N-phenyl)-14H-dibenzo[a,j]acridines without solvent at 100 °C .The chlorometallates were confirmed by FT-IR, UV/Vis, Raman, PXRD, SEM-EDX, TGA, Hammett acidity and elemental analyses.
      PubDate: 2017-07-07T04:55:55.346066-05:
      DOI: 10.1002/aoc.3900
       
  • Antimicrobial and anticancer activities of Schiff base ligand and its
           transition metal mixed ligand complexes with heterocyclic base
    • Authors: H. F. Abd El-Halim; Gehad G. Mohamed, Mahmoud N. Anwar
      Abstract: A new Schiff base ligand (HL) was prepared via a condensation reaction of quinoline-2-carboxaldhyde with 2-aminophenol in a molar ratio of 1:1. Its transition metal mixed ligand complexes with 1,10-phenanthroline (1,10-phen) as co-ligand were also synthesized in a 1:1:1 ratio. HL and its mixed ligand complexes were characterized using elemental analysis, infrared, 1H NMR, mass and UV–visible spectroscopies, molar conductance, magnetic measurements, solid reflectance, thermal analysis, electron spin resonance and X-ray diffraction. Molar conductance measurements showed that all complexes have an electrolytic nature, except Cd(II) complex. From elemental and spectral data, the formulae [M(L)(1,10-phen)(H2O)]Clx⋅nH2O (where M = Cr(III) (x = n = 2), Mn(II) and Ni(II) (x = 1, n = 2), Fe(III) (x = n = 2), Co(II), Cu(II) and Zn(II) (x = 1, n = 2)) and [Cd(L)(1,10-phen)Cl]⋅3H2O for the metal complexes have been proposed. The geometric structures of complexes were found to be octahedral. Powder X-ray diffraction reflected the crystalline nature of the complexes; however, the Schiff base is amorphous. HL and its mixed ligand complexes were screened against Gram-positive bacteria (Streptococcus pneumoniae and Bacillus subtilis) and Gram-negative bacteria (Pseudomonas aeruginosa and Escherichia coli). Antifungal activity was determined against Aspergillus fumigatus and Candida albicans, the data showing that most complexes had activity less than that of the Schiff base while Mn(II), Fe(III) and Ni(II) complexes showed no significant antifungal activity. The anticancer activity of HL and its metal complexes was also studied against breast and colon cell lines. The metal complexes showed IC50 higher than that of HL, especially the Cu(II) complex which showed the highest IC50 against breast cell line.The relation between M─O bond strength and inhibition zone diameter of metal complexes.
      PubDate: 2017-07-07T04:55:25.272053-05:
      DOI: 10.1002/aoc.3899
       
  • Biohybrid based on layered terbium hydroxide and applications as drug
           carrier and biological fluorescence probe
    • Authors: Ruijun Ju; Qingyang Gu
      Abstract: Aspirin (abbr. ASA) is intercalated into the layered terbium hydroxide (LTbH) by anion exchange method. Structure, chemical compositions, thermostability, morphology, luminescence property, cytotoxic effects and controlled-release behaviors have been investigated. The ASA molecules may embed between layers with monolayered vertical arrangement, and the thermal stability of organics was enhanced after intercalation. The Tb3+ luminescence in ASA-LTbH composites was enhanced compared with LTbH precusor and the luminescence intensity increased with the deprotonation degree. The cytotoxic effect of LTbH was observed with a sulforhodamine B (SRB) colorimetric assay, which revealed that the LTbH showed low cytotoxic effects. In addition, the ASA-LTbH composites exhibited a sustained release of ASA in Na2HPO4-NaH2PO4 buffer solution at pH 6.86 and 37°C. Construction of LRHs composites with drug molecules provided a beneficial pathway for preparing biohybrid based on LRHs, which may have potential applications in drug delivery carrier and biological fluorescence probe.Intercalation of aspirin (APC) into layered terbium hydroxide (LTbH) to form composites. The composites show excellent pharmaceutical properties and luminescence properties, which may have potential applications in drug carrier and biological fluorescence probe.
      PubDate: 2017-07-07T04:50:40.449535-05:
      DOI: 10.1002/aoc.3926
       
  • Synthesis of nanomagnetic supported thiourea–copper(I) catalyst and its
           application in the synthesis of triazoles and benzamides
    • Authors: Leila Mohammadi; Mohammad Ali Zolfigol, Ardeshir Khazaei, Meysam Yarie, Samira Ansari, Saeid Azizian, Maryam Khosravi
      Abstract: A novel nanomagnetic supported thiourea–copper(I) complex and inorganic–organic Takemoto-like hybrid nanomagnetic catalyst was designed, and synthesized. The prepared naomagnetic catalyst was characterized using Fourier transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray analysis, transmission and scanning electron microscopies, thermogravimetry, nitrogen adsorption/desorption, zeta potential and vibrating sample magnetometry. Furthermore, the fabricated dual-role inorganic–organic hybrid catalyst shows a striking and robust catalytic activity for the synthesis of triazoles and benzamides through click and coupling reactions, respectively, under mild and eco-friendly reaction conditions.A novel inorganic–organic Takemoto-like hybrid nanomagnetic catalyst was constructed. The structural verification of the new catalyst was fully made by applying various methods. The fabricated dual-role hybrid catalyst showed striking and robust catalytic activity for the synthesis of triazoles and benzamides through click and coupling reactions, respectively, under mild and eco-friendly reaction conditions.
      PubDate: 2017-07-07T03:56:08.143194-05:
      DOI: 10.1002/aoc.3933
       
  • Simultaneous removal of Cu2+ and Cr3+ ions from aqueous solution based on
           Complexation with Eriochrome cyanine-R and derivative spectrophotometric
           method
    • Authors: Ahmad Reza Bagheri; Mehrorang Ghaedi, Kheibar Dashtian, Shaaker Hajati, Ali Akbar Bazrafshan
      Abstract: TiO2 nanoparticles deposited on activated carbon (TiO2–NP–AC) was prepared and characterized by XRD and SEM analysis. Subsequently, simultaneous ultrasound-assisted adsorption of Cu2+ and Cr3+ ions onto TiO2-NPs-AC after complexation via eriochrome cyanine R (ECR) has been investigated with UV–Vis and FAA spectrophotometer. Spectra overlapping of the ECR-Cu and ECR-Cr complex was resolve by derivative spectrophotometric technique. The effects of various parameters such as initial Cu2+ (A) and Cr3+ (B) ions concentrations, TiO2-NPs-AC mass (C), sonication time (D) and pH (E) on the removal percentage were investigated and optimized by central composite design (CCD). The optimize conditions were set as: 4.21 min, 0.019 mg, 20.02 and 13.22 mg L−1 and 6.63 for sonication time, TiO2–NP–AC mass, initial Cr3+ and Cu2+ ions concentration and pH, respectively. The experimental equilibrium data fitting to Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models show that the Langmuir model is a good and suitable model for evaluation and the actual behavior of adsorption process and maximum adsorption capacity of 105.26 and 93.46 mg g−1 were obtained for Cu2+ and Cr3+ ions, respectively. Kinetic evaluation of experimental data showed that the adsorption processes followed well pseudo second order and intraparticle diffusion models.TiO2 nanoparticles deposited on activated carbon (TiO2–NP–AC) was prepared and characterized by XRD and SEM analysis. Subsequently, simultaneous ultrasound-assisted adsorption of Cu2+ and Cr3+ ions onto TiO2-NPs-AC after complexation via eriochrome cyanine R (ECR) has been investigated with UV–Vis and FAA spectrophotometer. Spectra overlapping of the ECR-Cu and ECR-Cr complex was resolve by derivative spectrophotometric technique.
      PubDate: 2017-07-07T03:46:03.304041-05:
      DOI: 10.1002/aoc.3918
       
  • Synthesis of soluble and meltable pre-ceramic polymers for Zr-containing
           ceramic nanocomposites
    • Authors: Xin Long; Changwei Shao, Jun Wang, Yanzi Gou
      Abstract: Polymer-derived methods are one of the most important tools for the synthesis of ceramics with a finely dispersed microstructure. In this study, a soluble and meltable ZrC/C pre-ceramic polymer, P-DACZ, (which would later exhibit a high ceramic yield of 71 wt%) was synthesized via radical polymerization. By adding low molecular weight polycarbosilane in any proportion during the radical polymerization process of P-DACZ, a soluble and meltable ZrC/SiC/C pre-ceramic precursor, PCS-DACZ (which would later exhibit a high ceramic yield of>80 wt%) was synthesized. After annealing at 1400 °C under an argon flow, the precursors converted into bulk ZrC/C and ZrC/SiC/C ceramic nanocomposites. The ZrC nanoparticles could resist any grain growth when heat-treated at temperatures above 1800 °C because the C or SiC matrix prevented long-range atomic diffusion of zirconium. Such ceramic nanocomposites would be suitable for structural and (multi)functional applications at harsh environments with high temperatures.The synthesized soluble and meltable pre-ceramic polymers can convert into bulk ZrC/C and ZrC/SiC/C ceramic nanocomposites after annealing at 1400 °C under an argon flow. The ZrC nanoparticles could resist any grain growth when heat treated at temperatures above 1800 °C because the C or SiC matrix prevented long range atomic diffusion of zirconium.
      PubDate: 2017-07-05T03:11:15.699372-05:
      DOI: 10.1002/aoc.3942
       
  • N-(3-silyl propyl) diethylene triamine N,N',N''-tri-sulfonic acid
           immobilized on Fe3-xTixO4 magnetic nanoparticles: A new recyclable
           heterogeneous nanocatalyst for the synthesis of hexahydroquinolines
    • Authors: Davood Azarifar; Younes Abbasi, Omolbanin Badalkhani
      Abstract: In the present study, for the first time N-(3-silyl propyl) diethylene triamine N,N',N''-tri-sulfonic acid (SPDETATSA) was grafted on magnetic Fe3-xTixO4 nanoparticles. The structure of the resulted nanoparticles was characterized based on Fourier-transform infrared (FT-IR), energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), and vibrating sample magnetometer (VSM) analyses. The results confirmed the successful immobilization of sulfamic acid groups onto the magnetic support. These nanoparticles exhibited high catalytic activity as novel magnetically recyclable acid nanocatalyst in the synthesis of a diverse range of hexahydroquinolines through one-pot tandem reactions in excellent yields. Also, this nanocatalyst performed satisfactory catalytic maintenance of activity for the synthesis of the reaction products after 4 rounds of recycling with no considerable loss of activity.For the first time N-(3-silyl propyl) diethylene triamine N,N',N''-tri-sulfonic acid (SPDETATSA) was grafted on magnetic Fe3-xTixO4 nanoparticles. The structure of the resulted nanoparticles was characterized based on FT-IR, EDX, SEM, TEM, TGA and VSM techniques. These nanoparticles exhibited high catalytic activity in synthesis of hexahydroquinolines from tandem reactions in excellent yields.
      PubDate: 2017-07-05T03:05:56.639567-05:
      DOI: 10.1002/aoc.3939
       
  • Supported copper (I) catalyst from fish bone waste: An efficient, green
           and reusable catalyst for the click reaction toward N-substituted
           1,2,3-TRIAZOLES
    • Authors: Xingquan Xiong; Zhongke Tang, Zhaohong Sun, Xiaoqing Meng, Sida Song, Zhilong Quan
      Abstract: An eco-efficient, green, and multi-gram procedure is presented for one-pot multicomponent synthesis of N-substituted 1,2,3-triazoles by using waste fishbone powders supported CuBr (FBPs-CuBr) as catalyst. FBPs-CuBr is found to be an efficient heterogeneous catalyst and a series of 1,2,3-triazoles are obtained in moderate to excellent yields in water under MW irradiation (70–98%). It can be separated conveniently by a simple filtration and reused at least seven consecutive runs with a slight drop in the product yields. Furthermore, the desired product still could be obtained in 80% yield when the scale of the reaction was increased to 40.0 mmol.Waste fishbone powders supported CuBr (FBPs-CuBr) was developed for the synthesis of N-substituted 1, 2, 3-triazoles in good to excellent yields under microwave-assisted condition. The N-substituted 1, 2, 3-triazole in the model reaction could be prepared in 80% yield even when the reaction scale was increased to 40 mmol.
      PubDate: 2017-07-05T03:01:11.118749-05:
      DOI: 10.1002/aoc.3946
       
  • Click approach to the three-component synthesis of novel
           β-hydroxy-1,2,3-triazoles catalysed by new (Cu/Cu2O) nanostructure as a
           ligand-free, green and regioselective nanocatalyst in water
    • Authors: Hadi Esmaeili-Shahri; Hossein Eshghi, Jalil Lari, Seyyed Amin Rounaghi
      Abstract: Copper nanostructures were produced as an effective and regioselective catalyst for the synthesis of 1,2,3-triazoles from a wide range of raw materials, such as sodium azide, epoxides and terminal alkynes, in water via a one-pot three-component click reaction. The new heterogeneous catalyst was prepared by a simple ball mill reduction of CuO with NaBH4 using a ball-to-powder weight ratio of 50:1 under air atmosphere at room temperature. The catalyst was fully characterized using scanning electron microscopy, energy-dispersive X-ray analysis, Fourier transform infrared spectroscopy and X-ray diffraction. The copper nanostructures catalysed both ring opening and triazole cyclization steps. Products were obtained in high yields and short reaction times. The reactions were performed at ambient temperature in water as a green solvent. The Cu/Cu2O nanostructures revealed high reusability and high stability via a simple recycling process.1,4-Disubstituted 1,2,3-triazoles were synthesized from sodium azide, epoxides and terminal alkynes in water via a one-pot three-component click reaction. Cu/Cu2O nanostructures as a regioselective and reusable catalyst were used in the synthesis. This method has many advantages including the use of water as a green solvent under mild conditions.
      PubDate: 2017-07-05T03:00:38.53054-05:0
      DOI: 10.1002/aoc.3947
       
  • Magnetic Fe3O4 nanoparticles supported imine/Thiophene-nickel (II)
           complex: A new and highly active heterogeneous catalyst for the synthesis
           of polyhydroquinolines and 2, 3-dihydroquinazoline-4(1H)-ones
    • Authors: Lotfi Shiri; Leili Heidari, Mosstafa Kazemi
      Abstract: A new magnetically separable nickel catalyst (Ni(NO3)2−Imine/Thiophene-Fe3O4@SiO2) was readily prepared and structurally characterized by Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), Vibrating sample magnetometer (VSM), X-Ray diffraction (XRD) and Atomic absorption spectroscopy (AAS). The Ni(NO3)2−Imine/Thiophene-Fe3O4@SiO2 exhibited efficient catalytic activity in the synthesis of 2,3-dihydroquinazoline-4(1H)-ones and polyhydroquinolines. Catalysis research under water and solvent-free conditions makes also this synthetic protocol ideal and fascinating from the environmental point of view. The catalyst can be magnetically recovered after the reaction and can be reused for many times without appreciable decrease in activity.Magnetic Fe3O4 nanoparticles supported Imine/Thiophene-nickel (II) complex (Ni(NO3)2−Imine/Thiophene-Fe3O4@SiO2) was shown to be a versatile and highly efficient reusable catalyst for the synthesis of polyhydroquinoline and 2,3-dihydroquinazoline-4(1H)-one derivatives.
      PubDate: 2017-07-05T02:55:52.748348-05:
      DOI: 10.1002/aoc.3943
       
  • Polymerization of graphene oxide nanosheet by using of aminoclay:
           Electrocatalytic activity of its platinum nanohybrids
    • Authors: S. Jafar Hoseini; Mehrangiz Bahrami, Mahnaz Maddahfar, Roghayeh Hashemi Fath, Mahmoud Roushani
      Abstract: This study describes the polymerization of graphene oxide (GO) nanosheet to reduced-GO-aminoclay (RGC) by covalent functionalization of chemically reactive epoxy groups on the basal planes of GO with amine groups of magnesium phyllosilicate clay (known as aminoclay). The resulting RGC sheets were characterized and applied to support platinum nanostructures at toluene/water interface. Pt nanoparticles (NPs) with diameters about several nanometers were adhered to RGC sheets by chemical reduction of [PtCl2(cod)] (cod = cis,cis-1,5-cyclooctadiene) complex. Catalytic activity of Pt NPs thin films were investigated in the methanol oxidation reaction. Cyclic voltammetry results exhibit that the Pt/reduced-GO (RGO) and Pt/RGC thin films showed improved catalytic activity in methanol oxidation reaction in comparison to other Pt NPs thin films, demonstrating that the prepared Pt/RGO and Pt/RGC thin films are promising catalysts for direct methanol fuel cell.In this study, we have compared the electrocatalytic activity of Pt/reduced graphene oxide and Pt/reduced graphene-clay thin films in methanol oxidation reaction that showed improved catalytic activity in comparison to other Pt nanoparticle thin films.
      PubDate: 2017-07-05T02:51:15.231724-05:
      DOI: 10.1002/aoc.3894
       
  • The composite catalysts of Cu/CuxO nanoparticles supported on the carbon
           fibers were prepared for styrene oxidation reaction
    • Authors: Hongchun Mu; Chunping Li, Jie Bai
      Abstract: In this paper a novel simple method for preparing two different catalysts with various-valences copper was reported. Carbon nanofibers supported copper-cuprous oxide nanoparticles (Cu-Cu2O NPs/CNFs) and copper oxide nanoparticles (CuO NPs/CNFs) through electrospinning, adsorption and reduction in the high-pressure hydrogenation and the high-temperature calcination methods. These catalysts were investigated by a series of characterizations and were applied in reaction in nitrogen atmosphere, which had a good catalytic activity and selectivity of benzaldehyde for the reaction. Above all, the new study has been certified clearly, in which Cu-Cu2O NPs/CNFs and CuO NPs/CNFs composite catalysts enhanced the generation of benzaldehydeand the excellent catalytic properties were exhibited.Two catalysts of Cu/Cu2O NPs/CNFs and CuO NPs/CNFs were formed by electrospunning, carbonization, immersing, high-pressure hydrogenation and high-temperature decomposition methods. These catalysts were applied for styrene oxidation reaction under nitrogen atmosphere which had a good catalytic activity and selectivity of benzaldehyde for the reaction. Above all, the new study that Cu/Cu2O NPs/CNFs and CuO NPs/CNFs composite catalysts were contributed to the generation of benzaldehyde has been certified clearly, and the excellent catalytic properties were exhibited to us.
      PubDate: 2017-07-05T02:46:10.654826-05:
      DOI: 10.1002/aoc.3890
       
  • Synthesis and characterization of sulfamic acid supported on Fe3O4
           nanoparticles: A green, versatile and magnetically separable acidic
           catalyst for oxidation reactions and Knoevenagel condensation
    • Authors: Lotfi Shiri; Hojatollah Narimani, Mosstafa Kazemi
      Abstract: Sulfamic acid immobilized on diethylenetriamine functionalized Fe3O4 nanoparticles (SA-DETA-Fe3O4) was successfully prepared and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM), thermo gravimetric analysis (TGA), X-Ray diffraction (XRD) and scanning electron microscopy (SEM). The sulfamic acid was found as a magnetically separable and highly active catalyst for the oxidative coupling thiols, oxidation of sulfides. Furthermore, the SA-DETA-Fe3O4 showed the high catalytic activity in Knoevenagel condensation of aromatic aldehydes with active methylene compounds (malononitrile and ethyl cynoacetate). The nanosolid catalyst could be easily recovered by a simple magnetic separation and reused for many cycles without deterioration in catalytic activity.Sulfamic acid immobilized on amino-functionalized magnetic Fe3O4 nanoperticles (SA-DETA-Fe3O4) was shown to be a versatile and highly efficient reusable catalyst for theorganic oxidation reactions and Knoevenagel condensation.
      PubDate: 2017-07-05T02:41:07.122614-05:
      DOI: 10.1002/aoc.3927
       
  • Structural designing, spectral and computational studies of bioactive
           Schiff's base ligand and its transition metal complexes
    • Authors: Seema Gautam; Sulekh Chandra, Hament Rajor, Swati Agrawal, Praveen Kumar Tomar
      Abstract: Transition metal complexes of Mn(II) and Ni(II) have been synthesized with novel bioactive Schiff's base ligand. Schiff's base ligand i.e. benzoylacetone-bis(2-amino-4-methylbenzothioazole) has been synthesized via condensation reaction between 2-amino-4-methylbenzothioazole and benzoylacetone in 2:1 ratio, respectively. Synthesized ligand has been characterized using elemental analysis, infra-red, 1H–NMR and mass spectroscopy techniques. Characterization of complexes was based on magnetic moment, molar conductance, elemental analysis, electronic spectra, infra-red and EPR spectroscopic techniques. Molar conductance data suggest that metal complexes are non-electrolytic in nature. Therefore, these complexes are formulated as [M(L)X2], where M = Mn(II), Ni(II), L = Schiff's base ligand, X = Cl−, CH3COO−, NO3−. Data of characterization study suggest octahedral geometry for Mn(II) and Ni(II) complexes. Geometry of metal complexes was also optimized with the help of computational study i.e. molecular modelling. Computational study also suggests octahedral geometry for complexes. Free ligand as well as its all metal complexes have been screened against the growth of pathogenic bacteria (E.coli, S.aureus) and fungi (C.albicans, C.krusei, C.parapsilosis, C.tropicalis) to assess their inhibition potential. The inhibition data revealed that metal complexes exhibit higher inhibition potential against the growth of bacteria and fungi microorganisms than free ligand.Synthesis and characterization of novel bioactive Schiff's base ligand and its metal complexes were done by various spectral techniques, molecular modelling.On the basis of characterization study data, metal complexes possess six coordinated octahedral geometry.Thermal data suggested that metal complexes are more thermal stable than free Schiff's base ligand.In vitro antibacterial and antifungal activity of synthesized ligand and its metal complexes were screened.All metal complexes were more biologically sensitive than ligand against the growth of microorganism.
      PubDate: 2017-07-05T02:35:37.330218-05:
      DOI: 10.1002/aoc.3915
       
  • A capable cobalt nano-catalyst for the N-formylation of various amines and
           its biological activity studies
    • Authors: Davood Habibi; Somayyeh Heydari, Mina Afsharfarnia
      Abstract: The Fe3O4 magnetic nanoparticles (Fe3O4 MNPs) were modified with 1,10-phenanthroline-5,6-diol and the relevant Co complex (Fe3O4@Phendiol@Co) synthesized as a nano-magnetic heterogeneous catalyst to be used for the N-formylation of various amines at room temperature under solvent-free conditions. Also, in order to find the better concept of the catalyst role, the N-formylation reaction was carried out by the use of ultrasound irradiation in the absence of the Co nano-catalyst and the results were compared. The catalyst characterized by different methods such as the elemental analysis (CHN), ICP, FT-IR, XRD, EDX, SEM, TEM, TG-DTA, VSM and XPS. In addition, the antioxidant and the antibacterial activities of the Fe3O4@Phendiol@Co nano-catalyst and its Phendiol ligand were in vitro screened by 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging and disc diffusion methods. Results showed that they possess strong antioxidant activity (IC50; 0.182 ± 0.006 mg/ml) and good antibacterial potential in comparison to standards.N-formylation of various amines by the Co nano-catalyst at room temperature under solvent-free conditions.
      PubDate: 2017-07-05T02:31:19.517165-05:
      DOI: 10.1002/aoc.3874
       
  • Synthesis, structure and in vitro antiproliferative activities of
           oxamido-bridged dicopper(II) complexes: A comparative study of
           experimental evidence and molecular docking of DNA/protein binding
    • Authors: Ling-Yang Wang; Kang Zheng, Yan-Tuan Li, Zhi-Yong Wu, Cui-Wei Yan
      Abstract: Two μ-oxamido-bridged dicopper(II) complexes, namely [Cu2(hmpoxd)(H2O)(phen)](ClO4) (1) and [Cu2(papo)(H2O)(phen)](ClO4)·2H2O (2), where H3hmpoxd and H3papo represent N-(2-hydroxy-5-methylphenyl)-N′-[3-(dimethylamino)propyl]oxamide and N-(2-hydroxylphenyl)-N′-(3-aminopropyl)oxamide, respectively, and phen represents 1,10-phenanthroline, were synthesized. Single-crystal X-ray crystallography and other methods revealed that the two copper(II) ions in complex 1 are bridged by the cis-hmpoxd3− with Cu···Cu separation of 5.1896(7) Å, in which the inner (Cu1) and outer (Cu2) copper(II) atoms are located in square-planar and square-pyramidal geometries, respectively. To evaluate the effects of bridging ligand hydrophobicity on DNA/protein binding and potential anticancer activities, comparative studies of the reactivity towards herring sperm DNA and protein bovine serum albumin (BSA) as well as cytotoxicity of complex 1 with our previously reported complex 2 were conducted theoretically and experimentally. The results indicate that the two complexes can interact interactively with DNA, and bind to BSA via the binding sites Trp213 for 1 and Trp134 for 2. Interestingly, the in vitro anticancer activities and DNA/protein binding affinities consistently follow the order of 1> 2.The DNA/BSA binding properties of synthesized dicopper(II) complexes are studied theoretically and experimentally. The importance of bridging ligand hydrophobicity is highlighted.
      PubDate: 2017-07-05T02:25:54.914113-05:
      DOI: 10.1002/aoc.3940
       
  • Equisetum arvense As an abundant source of silica nanoparticles.
           SiO2/H3PW12O40 nanohybrid material as an efficient and environmental
           benign catalyst in the synthesis of 2-amino-4H-chromenes under
           solvent-free conditions
    • Authors: Reza Tayebee; Akbar Pejhan, Hassan Ramshini, Behrooz Maleki, Nasrin Erfaninia, Zohre Tabatabaie, Effat Esmaeili
      Abstract: Uniform SiO2 nanoparticles were successfully prepared from Equisetum arvense obtained from the north-east of Iran. Then, surface modification of the extracted nanoparticles was performed with a methanol solution of H3PW12O40 via wet impregnation method. The prepared nanocatalyst was characterized by XRD, FESEM, ICP, UV–Vis, and FT-IR spectroscopy. The supported heterogeneous nanocatalyst was successfully applied as a Lewis/Bronsted acid catalyst in the synthesis of a series of substituted 4H–chromenes via condensation of aromatic aldehydes, malononitrile, and 4-hydroxycoumarin under solventless conditions with fine yields in appropriately short times.SiO2/HPA nanoparticles were prepared, characterized and performed as efficient heterogeneous acid catalyst in the synthesis of substituted 4H–chromenes under solventless conditions.
      PubDate: 2017-07-05T02:20:51.035239-05:
      DOI: 10.1002/aoc.3924
       
  • Fe3O4-Methylene diphenyl diisocyanate-guanidine (Fe3O4–4,4′-MDI-Gn): A
           novel superparamagnetic powerful basic and recyclable nanocatalyst as an
           efficient heterogeneous catalyst for the Knoevenagel condensation and
           tandem Knoevenagel-Michael-cyclocondensation reactions
    • Authors: Razieh Maleki; Nadiya Koukabi, Eskandar Kolvari
      Abstract: In this paper, guanidine groups (Gn) supported on modified magnetic nanoparticles (Fe3O4–4,4′-MDI) were synthesized for the first time. The catalyst synthesized was characterized by various techniques such as SEM (Scanning Electron Microscopy), TEM (Transmission electron microscopy), XRD (X-ray Diffraction), TGA (Thermogravimetric ananlysis), EDS (Energy-dispersive X-ray spectroscopy) and VSM (vibrating sample magnetometer). The catalyst activity of modified MNPs–MDI-Gn, as powerful basic nanocatalyst, was probed through the Knoevenagel and Tandem Knoevenagel–Michael-cyclocondensation reactions. Conversion was high under optimal conditions, and reaction time was remarkably shortened. This nanocatalyst could simply be separated and recovered from the reaction mixture by simple magnetic decantation and reused many times without significant loss of its catalytic activity. Also, the nanocatalyst could be recycled for at least seven (Knoevenagel condensation) and six (Knoevenagel and Tandem Knoevenagel–Michael-cyclocondensation) additional cycles after they were separated by magnetic decantation and, washed with ethanol, air-dried, and immediately reused.In this paper, we successfully synthesized supported iron oxide magnetic nanoparticles (Fe3O4–4,4′-MDI-Gn) from readily available starting materials. It was applied as magnetically recyclable and powerful basic heterogeneous nanocatalyst for the Knoevenagel and Tandem Knoevenagel–Michael-cyclocondensation reactions in excellent yields and short reaction times. This nanocatalyst could simply be separated and recovered from the reaction mixture by simple magnetic decantation and reused many times without significant loss of its catalytic activity. Furthermore, the catalyst could be recovered and reused without significant degradation in activity.
      PubDate: 2017-07-05T02:10:40.748112-05:
      DOI: 10.1002/aoc.3905
       
  • Electronic structures and photophysical properties of phosphorescent
           platinum (II) complexes with tridentate C^N*N cyclometalated ligands
    • Authors: Wenqian Li; Jian Wang, Xi Yan, Huize Zhang, Wei Shen
      Abstract: To get an insight into the structure–property relationships in a series of strongly phosphorescent platinum(II) complexes with tridentate C^N*N cyclometalated ligands, their electronic structures and electroluminescence properties were systematically investigated via density functional theory and time-dependent density functional theory. Moreover, the factors related to the radiative and non-radiative decay process, including the transition electric dipole moment μ(Sn), the energy difference between singlet and lowest triplet excited states ΔE(Sn–T1) and the spin–orbital coupling matrix elements ⟨Sn ĤSOC T1⟩, as well as the energy gap between T1 and S0 states ΔE(T1–S0) and absorption–emission Stokes shifts have been calculated. Fine emission color tuning and high phosphorescence quantum yield of phosphorescent complexes may be achieved through introducing five–six-membered metallacycle geometries and linking a substituent (such as phenyl) at bridge atoms. Additionally, phosphorescent properties of these complexes show a clear dependence on the electronegativity of bridge atoms.Heteroatoms were incorporated into the bridges between two pyridyls in main ligands to study the structure–property relationships of cyclometalated Pt(II) complexes and inspire new ideas for designing tridentate Pt(II) complexes.
      PubDate: 2017-06-29T02:35:46.603326-05:
      DOI: 10.1002/aoc.3929
       
  • Novel CuFe2O4@SiO2-OP2O5H magnetic nanoparticles: Preparation,
           characterization and first catalytic application to the synthesis of
           1,8-dioxo-octahydroxanthenes
    • Authors: Farzaneh Tajfirooz; Abolghasem Davoodnia, Mehdi Pordel, Mahmoud Ebrahimi, Amir Khojastehnezhad
      Abstract: New functionalized magnetic core–shell nanoparticles, CuFe2O4@SiO2-OP2O5H, were prepared by grafting of phosphorus pentoxide on CuFe2O4@SiO2 nanoparticles and characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray analysis, inductively coupled plasma optical emission spectrometry and vibrating sample magnetometry. The catalytic activity of CuFe2O4@SiO2-OP2O5H as a novel catalyst was evaluated in the synthesis of 1,8-dioxo-octahydroxanthenes under solvent-free conditions. The results showed that the catalyst has high activity and the desired products are obtained in high yields within short reaction times. The catalyst is readily recovered using magnetic decantation and can be used at least four times without noticeable deterioration in catalytic activity.New functionalized magnetic core–shell nanoparticles, CuFe2O4@SiO2-OP2O5H, were prepared by grafting of phosphorus pentoxide on CuFe2O4@SiO2 nanoparticles and characterized. The catalytic activity of CuFe2O4@SiO2-OP2O5H was evaluated in the synthesis of 1,8-dioxo-octahydroxanthenes under solvent-free conditions. The catalyst has high activity leading to products in high yields within short reaction times. The catalyst is readily recovered by magnetic decantation and can be used at least four times without loss of catalytic activity.
      PubDate: 2017-06-29T02:30:54.554761-05:
      DOI: 10.1002/aoc.3930
       
  • Preparation, characterization and biological evaluation of two chiral
           binuclear copper(II) complexes
    • Authors: Jing-Jing Suo; Zhong-Ying Ma, Jing-Yuan Xu, Jin-Lei Tian, Xin Liu
      Abstract: Two chiral Cu(II) complexes of [Cu2(R-L)2](PF6)2·2C2H5OH (1) and [Cu2(S-L)2](PF6)2·2C2H5OH (2) (HL = 2-(Bis(quinolin-2-ylmethyl)amino)-1-propanol) were designed and synthesized to serve as chemical nucleases and anticancer drugs. X-ray crystallography revealed that two complexes contain chiral binuclear cations and PF6− anions. The interaction of two complexes with CT-DNA was researched via various spectroscopic techniques and viscosity measurement, indicating that the complexes were bound to CT-DNA by a classical intercalation binding mode. In addition, the two complexes exhibited remarkable DNA cleavage activity with an optimal dosage of 10 μM in the absence of any exogenous oxidant agent. Both of the complexes showed excellent in vitro cytotoxicity on A549 cell lines with IC50 values in the low micromolar range. Moreover, complex 2 could damage DNA of A549 cells into fragmentation and then induced cell apoptosis in a dose-dependent manner, which was demonstrated by comet assay and Hoechst 33342 staining experiment. Further research showed that complex 2 could also induce G2 and S phase cell cycle arrest.In this contribution, we designed and synthesized two chiral binuclear Cu(II) complexes 1 and 2. Both of them exhibited remarkable DNA binding and cleavage ability. Moreover, they showed excellent in vitro cytotoxicity on A549 cell lines, and induced cell apoptosis and G2 and S phase cell cycle arrest, indicating 1 and 2 can be anticancer drug candidates.
      PubDate: 2017-06-29T02:16:27.411349-05:
      DOI: 10.1002/aoc.3911
       
  • Synthesis and characterization of the novel diamine-functionalized
           Fe3O4@SiO2 nanocatalyst and its application for one-pot three-component
           synthesis of chromenes
    • Authors: Ali Maleki; Reza Ghalavand, Razieh Firouzi Haji
      Abstract: Fe3O4@SiO2@propyltriethoxysilane@o-phenylendiamine as an environmentally-benign functionalized silica-coated magnetic organometallic nanomaterial has been synthesized and characterized by Fourier transforms infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) images and energy dispersive X-ray (EDX) and vibrating sample magnetometer (VSM) analyses. Then, its catalytic activity was investigated for the one-pot three-component condensation reaction between dimedone, malononitrile and various substituted aromatic aldehydes to afford the corresponding 2-amino-4H-chromene derivatives under mild reaction conditions. This nanocatalyst can be easily recovered from the reaction mixture by using a magnet and reused for at least five times without significant decrease in catalytic activity.A new and environmentally-benign OPDA-functionalized silica-coated magnetic heterogeneous catalyst have been synthesized and its activity was investigated for the one-pot three-component condensation reaction between aromatic aldehydes, dimedone and malononitrile to afford the corresponding chromene derivatives under mild reaction conditions.
      PubDate: 2017-06-29T02:15:52.655689-05:
      DOI: 10.1002/aoc.3916
       
  • Simultaneous formation of platinum-based nanocatalysts and degradation of
           dyes at oil/water interface: Comparative morphological and kinetic studies
           
    • Authors: Mehrangiz Bahrami; S. Jafar Hoseini
      Abstract: To decrease the water pollution of textile industries with a large amount of toxic and non-biodegradable colored dye effluents, an efficient technique is required to safely remove harmful pollutants. In this paper, the reaction between azo dyes and NaBH4 catalyzed by nanoparticles (NPs) thin films has been studied. We report insitu degradation of methyl orange (MO) and methyl red (MR) by using Pt-based thin films monitored by UV–Vis spectroscopy. We have synthesized different thin films such as Pt, PtPd, PtFeFe2O3, PtNi and PtAu films from Pt organometallic precursor in the MO and MR medium (dye degradation and NPs formation is happened simultaneously) and activity of these films were compared in the complete degradation of MO and MR dyes. Rate constants for the catalyzed reactions have been determined. PtPd NPs thin film has shown the highest rate constant for the degradation of MO and MR within only a few seconds due to its well-ordered structure. Furthermore, the effect of presence of MO on the morphology of NPs was investigated.Insitu degradation of methyl orange (MO) and methyl red (MR) is investigated by using Pt-based thin films that monitored by UV–Vis spectroscopy. Different thin films was synthesized such as Pt, PtPd, PtFeFe2O3, PtNi and PtAu films by using organometallic Pt precursor in the MO and MR medium (dye degradation and NPs formation is happened simultaneously) and activity of these films were compared in the complete degradation of MO and MR dyes.
      PubDate: 2017-06-29T02:11:19.687025-05:
      DOI: 10.1002/aoc.3920
       
  • A mixed-ligand quinazoline-based Ni(II) Schiff base complex: Synthesis,
           characterization, crystal structure, antimicrobial investigation and
           catalytic activity for the synthesis of
           2H–indazolo[2,1-b]phthalazine-triones
    • Authors: Fateme Khajoee Nejad; Mehrji Khosravan, S. Yousef Ebrahimipour, Franco Bisceglie
      Abstract: A tridentate Schiff base ligand, (E)-3-((2-hydroxy-3-methoxybenzylidene)amino)-2-methylquinazolin-4(3H)-one [HL], and its mixed-ligand Ni(II) complex [Ni(L)(imi)], were synthesized and fully characterized using elemental analysis, FT-IR, UV–Vis and 1HNMR spectroscopy techniques. The structure of the synthesized ligand and complex was determined with single crystal X-ray diffraction method. In the complex, a square planner geometry was observed around the Ni(II) central atom coordinated with the donor atoms of the Schiff base ligand and one nitrogen of imidazole group. In addition, the catalytic activity of the complex on the three-component condensation of hydrazine hydrate with phthalic anhydride and dimedone to obtain 2H–indazolo[2,1-b]phthalazine-triones was investigated. Furthermore, in-vitro antimicrobial studies were performed that indicated the great antibacterial activities of the Ni(II) complex against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa and Bacillus cereus bacteria.A novel mixed-ligand quinazoline-based Ni(II) Schiff base complex was used as an efficient catalyst for the synthesis of 2H–indazolo[2,1-b]phthalazine-triones. The synthesized Ni(II) complex also showed better antibacterial activity compared with the parent Schiff base ligand.
      PubDate: 2017-06-29T02:10:27.631026-05:
      DOI: 10.1002/aoc.3907
       
  • Ni@Pd nanoparticles supported on ionic liquid-functionalized KCC-1 as
           robust and recyclable nanocatalysts for cycloaddition of propargylic
           amines and CO2
    • Authors: Seyed Mohsen Sadeghzadeh; Rahele Zhiani, Shokufe Emrani
      Abstract: Novel heterogeneous catalyst systems comprised of a fibrous nanosilica-supported nano-Ni@Pd-based ionic liquid (KCC-1/IL/Ni@Pd) are described for the cyclization of propargylic amines with CO2 to provide 2-oxazolidinones. KCC-1 with high surface area was functionalized with IL acting as a robust anchor so that the nano-Ni@Pd was well dispersed on the fibres of the KCC-1 microspheres, without aggregation. Because of the amplification effect of IL, high loading capacities of the nanocatalysts were achieved. The reported synthesis includes several advantages like solvent-free conditions, operational simplicity, short reaction times, environmentally benign reaction conditions, cost effectiveness, high atom economy and excellent yields, making it a genuinely green protocol.Novel heterogeneous catalyst systems comprised of a fibrous nanosilica-supported nano-Ni@Pd-based ionic liquid (KCC-1/IL/Ni@Pd) are described for the cyclization of propargylic amines with CO2 to provide 2-oxazolidinones.
      PubDate: 2017-06-29T02:06:30.966309-05:
      DOI: 10.1002/aoc.3941
       
  • A novel Prussian blue-magnetite composite synthesized by self-template
           method and its application in reduction of hydrogen peroxide
    • Authors: Wei Cai; Songhai Wu, Yong Liu, Danlin Li
      Abstract: A novel Prussian blue (PB)-Fe3O4 composite has been prepared for the first time by self-template method using PB as the precursor. According to this method, Fe3O4 nanoparticles distributed uniformly on the surface of PB cube. The feed ratio of sodium acetate to PB has been proved to be a key factor for magnetic properties and electro-catalysis properties of the composite. Under the experimental conditions, the saturation magnetization value (Ms) of PB-Fe3O4–2 composite was 22 emug−1, while the Ms value of other samples reduced. The composites also showed a good peroxidase-like activity for the oxidation of substrate 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H2O2. The catalytic reduction of hydrogen peroxide capacity was PB-Fe3O4–1> PB-Fe3O4–2> PB-Fe3O4–3> PB-Fe3O4–0, which confirmed the Fe(II) centres in PB surface and Fe3O4 nanoparticles had synergistic effect on catalytic reduction of hydrogen peroxide.Herein, a self-template method that PB was used not only as the template but also as iron source for the formation of Fe3O4 nanoparticles was used to synthesize a novel composite material, which consists of micron-sized PB cube and nano-scale Fe3O4 spherical particles. Moreover, magnetic and electrochemical properties were investigated. Besides, the composites were applied in a promising catalyst for the reduction of hydrogen peroxide.
      PubDate: 2017-06-29T02:01:19.995285-05:
      DOI: 10.1002/aoc.3909
       
  • Ferrocene based chiral binuclear η6-benzene-Ru(II)-phosphinite complexes:
           Synthesis, characterization and catalytic activity in asymmetric reduction
           of ketones
    • Authors: Yaser W. Abdlhmed Al-bayati; Duygu Elma Karakaş, Nermin Meriç, Murat Aydemir, Feyyaz Durap, Akın Baysal
      Abstract: In the present study, a series of chiral C2-symmetric ferrocenyl based binuclear η6-benzene-Ru(II) complexes bearing diphenylphosphinite and diisopropylphosphinite moieties have been synthesised. The new binuclear η6-benzene-Ru(II)-phosphinite complexes were characterised based on nuclear magnetic resonance (1H, 13C, 31P–NMR), FT-IR spectroscopy and elemental analysis. Then, these complexes have been screened as catalytic precursors in the transfer hydrogenation of acetophenone with 2-propanol as both the hydrogen source and solvent in the presence of KOH. The corresponding optically active secondary alcohols were obtained in excellent conversion rates between 96 and 99% and moderate to good enantioselectivities (up to 78% ee). The complex 5 was the most efficient catalyst among the four new complexes investigated herein.Chiral C2-symmetric ferrocenyl based binuclear η6-benzene-ruthenium(II) complexes bearing diphenylphosphinite and diisopropylphosphinite moieties have been synthesised. These complexes have been screened as catalytic precursors in the transfer hydrogenation of acetophenone with 2-propanol in the presence of KOH. The corresponding optically active secondary alcohols were obtained in excellent conversion rates between 96 and 99 % and moderate to good enantioselectivities (up to 78% ee).
      PubDate: 2017-06-29T02:01:05.998308-05:
      DOI: 10.1002/aoc.3919
       
  • Ag-nanoparticle embedded p(AA) hydrogel as an efficient green
           heterogeneous Nano-catalyst for oxidation and reduction of organic
           compounds
    • Authors: Massomeh Ghorbanloo; Ali Heydari, Hidenori Yahiro
      Abstract: P(AA)-Ag heterogeneous catalyst system comprised of Ag nanoparticles embedded within hydrogel matrices has been described for the selective aerobic oxidation of alcohols and reduction of nitro phenols in water. P(AA)-Ag nanocomposite was characterized by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal gravimetric analysis (TGA), X-Ray photoelectron spectroscopy (XPS) and inductively coupled plasma atomic emission spectrometer (ICP). Catalytic activity of p(AA)-Ag catalyst was investigated in the aerobic oxidation of primary alcohols and reduction of nitro compounds by emphasizing the effect of different parameters such as temperature, catalyst amount, substituent effect, etc. The catalyst was easily recovered from the reaction medium and it could be re-used for other three runs without significant loss of activity.p(AA)-Ag heterogeneous catalyst system has been described for the selective aerobic oxidation of alcohols in water. In the presence of the Ag catalyst, within 24 h and with 0.036 mmol Ag, 79% isolated yield of the benzoic acid and 1.96% yield of the benzaldehyde were obtained.
      PubDate: 2017-06-23T05:41:21.250682-05:
      DOI: 10.1002/aoc.3917
       
  • Four-, five- and six-coordinated transition metal complexes based on
           naphthalimide Schiff base ligands: Synthesis, crystal structure and
           properties
    • Authors: Yuling Xu; Han Zhang, Kesheng Shen, Shanshan Mao, Xinkui Shi, Huilu Wu
      Abstract: Two bidentate Schiff base ligands (HL1 = N-n-butyl-4-[(E)-2-(((2-aminoethyl)imino)methyl)phenol]-1,8-naphthalimide; and HL2 = N-n-butyl-4-[(E)-2-(((2-aminoethyl)imino)methyl)-6-methoxyphenol]-1,8-naphthalimide) with their metal complexes [Cu(L1)2] (1), [Zn(L1)2(Py)]2⋅H2O (2) and [Ni(L2)2(DMF)2] (3) have been synthesized and characterized. Single-crystal X-ray structure analysis reveals that complex 1 has a four-coordinated square geometry, while complex 2 is a five-coordinated square pyramidal structure and complex 3 is a distorted six-coordinated octahedral structure. Cyclic voltammograms of 1 indicate an irreversible Cu2+/Cu+ couple. In vitro antioxidant activity assay demonstrates that the ligands and the two complexes 1 and 3 display high scavenging activity against hydroxyl (HO•) and superoxide (O2−•) radicals. Moreover, the fluorescence properties of the ligands and complexes 1–3 were studied in the solid state. Metal-mediated enhancement is observed in 2, whereas metal-mediated fluorescence quenching occurs with 1 and 3.Three transition metal complexes based on naphthalimide Schiff base ligands have been synthesized and characterized systematically. The complexes and ligands have a strong potential to be applied as scavengers to eliminate radicals. Complex 2 has excellent fluorescence properties.
      PubDate: 2017-06-23T05:35:59.949943-05:
      DOI: 10.1002/aoc.3902
       
  • Ultrasonic treatment of water contaminated with various pollutants onto
           copper nanowires loaded on activated carbon using response surface
           methodology and artificial intelligent
    • Authors: Fakhri Yousefi; Mehrorang Ghaedi, Ebtesam Alekasir, Arash Asfaram
      Abstract: In this study, the potential application of copper nanowires loaded on activated carbon for simultaneous removal of Disulfine blue (DB), Crystal violet (CV) and Sunset yellow (SY) has been described. The relation between adsorption properties with variables such as solution pH, adsorbent value, contact time and initial dyes concentration was investigated and optimized. A three-layer artificial neural network (ANN) model was utilized to predict dyes removal (%) by adsorbent following conduction of experiments. The training of network at above mention experimental data confirms its ability to forecast the removal performance with a linear transfer function (purelin) at output layer. The Levenberg–Marquardt algorithm and tangent sigmoid transfer function (tansig) with 16 neurons at the hidden layer was applied. Parameters were optimized by central composite design (CCD) combined with response surface methodology (RSM) and desirability function. The accuracy of ANN was judged according to both MSE and AAD% at optimal conditions and results indicate its superiority to RSM model in term of higher R2 and lower AAD% values. This observation was also corroborated by the parity plots between the predicted and experimental values. The ANN model was better in both data fitting and prediction capability in comparison to RSM model.In this study, the potential application of copper nanowires loaded on activated carbon for simultaneous removal of Disulfine blue (DB), Crystal violet (CV) and Sunset yellow (SY) has been described. The relation between adsorption properties with variables such as solution pH, adsorbent value, contact time and initial dyes concentration was investigated and optimized by central composite design (CCD) combined with response surface methodology (RSM). An artificial neural network (ANN) with 16 neurons in hidden layer was applied to predict dyes removal.
      PubDate: 2017-06-23T05:30:45.352252-05:
      DOI: 10.1002/aoc.3878
       
  • Claycop/hydrazine: A new and highly efficient recyclable/reusable
           catalytic system for 1,4-disubstituted-1,2,3-triazole synthesis under
           solvent-free conditions
    • Authors: Hanan M. F. Elnagdy; Kongkona Gogoi, Abdul A. Ali, Diganta Sarma
      Abstract: Clay-supported copper(II) nitrate (claycop) has been used as an efficient catalyst for azide–alkyne cycloaddition reactions leading to 1,4-disubstituted 1,2,3-triazoles. The highly efficient claycop/hydrazine hydrate catalytic system affords triazoles in a few minutes (1–20 min) at room temperature, under mild and solvent-free conditions. High regioselectivity, excellent yields, ease of claycop synthesis and recyclability/reusability of the catalyst are considered as practical merits of the protocol.A very novel method is reported where click reaction proceeds in less than a minute at room temperature under solvent-free conditions. High regioselectivity and excellent yields of triazoles in very short time are some of the important features of this methodology. The catalyst is easy to prepare and it is recyclable and reusable.
      PubDate: 2017-06-23T05:26:43.414588-05:
      DOI: 10.1002/aoc.3931
       
  • Synthesis, characterization, electronic structure, and non-linear optical
           properties (NLO) of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) complexes
           with 5-phenylazo-8-hydroxyquinoline using DFT approach
    • Authors: Samir A. Abdel-Latif; H. Moustafa
      Abstract: 5-phenylazo-8-hydroxyquinoline and its newly metal complexes with Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) metal ions have been prepared and characterized using different analytical techniques. The complexes are distorted octahedral binding via one oxygen and nitrogen atoms of the ligand; two/three coordinated water molecules. 1:1 complexes contain one chloride or OH− ion and some complexes have one or two water of hydration whereas 1:2 complexes contain only two coordinated water molecules in their coordination spheres. All complexes behave as neutral in dimethylformamide (DMF). The electronic structure and non-linear optical parameters NLO of the complexes (ML and ML2) are investigated theoretically at the B3LYP/GEN level of theory. The geometries of the studied complexes are non-planner. The calculated EHOMO and ELUMO energies of the studied complexes were used to calculate the global properties; hardness (η), global softness (S) and electronegativity (χ). The total dipole moment (μtot), static total and anisotropy of polarizability (α, Δα) and static first hyperpolarizability (β) values were calculated and compared with urea as a reference compound. The studied complexes show promising optical properties.Newly 5-phenylazo-8-hydroxyquinoline complexes were prepared and characterized using different analytical and spectroscopic techniques. The electronic structure of the complexes are investigated theoretically at the B3LYP/GEN using LANL2DZ basis set for Mn, Co, Ni, Cu and Zn atoms and 6-311 G** basis set for C, H, N and O atoms. The non-linear optical parameters NLO and global properties of the studied complexes computed using B3LYP/LANL2DZ level of theory.
      PubDate: 2017-06-21T03:21:58.030574-05:
      DOI: 10.1002/aoc.3876
       
  • Synthesis of palladium concave Nanocubes with high-index facets and their
           catalytic properties
    • Authors: Zelin Cui; Xuefeng Bai, Yang Liu, Sheng Li
      Abstract: Palladium nanocrystals with a variety of shapes have received particular interest in recent years due to their unique properties in catalysis. Herein, Pd concave nanocubes with high-index facets (Pd-CNs) was synthesized by a simple water-based route without seeds using L-ascorbic acid (AA) as the reduction agent in the presence of CTAB. X-ray diffraction and transmission electron microscopy were employed to demonstrate the formation of concave structures with high-index facets of the Pd-CNs with an average size of 17.5 nm. The as-prepared Pd-CNs presented significantly higher catalytic activity than commercial Pd/C (an average particle size of 4.7 nm) in the electro-oxidation of methanol, but exhibited weaker property in Suzuki coupling reaction, which provided an evidence for the effect of shape and size on different reactions.Palladium concave nanocubes with high-index facets (Pd-CNs) was synthesized by a simple water-based route without seeds. The Pd-CNs (average size of 17.5 nm) presented significantly higher catalytic activity than commercial Pd/C (3.7 nm) in the electro-oxidation of methanol, but exhibited weaker property in Suzuki coupling reaction, which provided an evidence for the effect of shape and size on different reactions.
      PubDate: 2017-06-21T03:16:09.266741-05:
      DOI: 10.1002/aoc.3887
       
  • Tri- and diorganotin(IV) derivatives of non-steroidal anti-inflammatory
           drug sulindac: Characterization, electronic structures (DFT), DNA binding
           and plasmid cleavage studies
    • Authors: Ranjana Kumari; Mala Nath
      Abstract: Tri- and diorganotin(IV) derivatives of non-steroidal anti-inflammatory drug sulindac (Sul), coordinated with carboxylate oxygen, namely C23H25FO3SSn (1), C38H31FO3SSn (2), C32H43FO3SSn (3), C52H42F2O6S2Sn (4), C44H44S2Cl2O6F2Sn2 (5), C48H50F2O6S2Sn (6) and C56H66F2O6S2Sn (7), have been synthesized and characterized using analytical and spectroscopic (IR, 1H NMR, 13C NMR, 119Sn NMR and ESI-MS) techniques. Optimized geometry and electronic structures of the complexes obtained from density functional theory calculations indicate that complexes 1, 2, 3 and 7 are tetra-coordinated with monodentate carboxylates, 4 and 6 are hexa-coordinated with highly distorted octahedral geometry, whereas 5 is penta-coordinated with distorted trigonal bipyramidal geometry. Probable mode of DNA binding with ligand (Sul) and complexes 1–7 has been revealed via various biophysical techniques (UV–visible spectroscopy, fluorometry and circular dichroism). Intrinsic binding constants (Kb) obtained from UV–visible spectroscopy for Sul and complexes 1–7 are 3.69 × 104, and 7.3 × 103, 1.14 × 104, 1.47 × 104, 1.55 × 104, 1.49 × 104, 2.02 × 104, 1.17 × 104 M−1, respectively. The quenching constants (Ksv) using fluorometric titrations, calculated from competitive binding of ethidium bromide versus Sul/complexes with calf thymus DNA, also correspond to the above results. Circular dichroism spectral patterns of calf thymus DNA with Sul and complexes 1–7 have also been investigated. All the results reveal that the complexes bind with DNA through partial intercalative mode. pBr322 plasmid fragmentation has also been studied using gel electrophoresis, which shows the fragmentation of circular DNA by an increase in nicked form and also by the appearance of linear form with increasing concentration of drug or complexes.Organotin(IV) derivatives of NSAID, Sulindac have been synthesized, and their interaction with DNA studied through UV-visible, fluorescence and circular-dichroism spectroscopy revealed the partial intercalation mode of binding. Plasmid DNA cleavage study indicates the formation of nicked and linear form.
      PubDate: 2017-01-11T22:30:50.528337-05:
      DOI: 10.1002/aoc.3661
       
  • Palladium nanoparticles decorated on reduced graphene oxide: An efficient
           catalyst for ligand- and copper-free Sonogashira reaction at room
           temperature
    • Authors: Abhijit Mahanta; Najrul Hussain, Manash R. Das, Ashim J. Thakur, Utpal Bora
      Abstract: This article focuses on a room temperature copper-free Sonagashira cross-coupling reaction in ethanol, catalysed by palladium nanoparticles homogeneously deposited on reduced graphene oxide. The catalyst showed efficient catalytic activity towards the said coupling reaction, and was well characterized using various techniques, and could be reused up to six times with almost constant yield of the desired product. The attractions of this protocol are that the reaction completes within short reaction time under ligand- and copper-free conditions and it avoids harsh reaction conditions.An in situ synthesis of Pd nanoparticles decorated on reduced graphene oxide has been developed, which was used as an excellent catalyst for Sonogashira coupling reaction at room temperature under copper-, ligand- and amine-free conditions.
      PubDate: 2017-01-11T21:15:27.48549-05:0
      DOI: 10.1002/aoc.3679
       
 
 
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