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  Subjects -> CHEMISTRY (Total: 852 journals)
    - ANALYTICAL CHEMISTRY (52 journals)
    - CHEMISTRY (598 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (46 journals)
    - PHYSICAL CHEMISTRY (69 journals)

CHEMISTRY (598 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 10)
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: 38)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 18)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 24)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 252)
ACS Photonics     Full-text available via subscription   (Followers: 12)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 23)
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 Chimica Slovenica     Open Access  
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: 8)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 51)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 57)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 15)
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: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 21)
Advances in Nanoparticles     Open Access   (Followers: 15)
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: 20)
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)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
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: 66)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 15)
American Journal of Chemistry     Open Access   (Followers: 27)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 39)
Angewandte Chemie     Hybrid Journal   (Followers: 179)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 229)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 4)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
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: 16)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 22)
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: 4)
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: 326)
Biochemistry Insights     Open Access   (Followers: 6)
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: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 120)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 85)
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: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 68)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 5)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 15)
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: 25)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 21)
Chemical Reviews     Full-text available via subscription   (Followers: 184)
Chemical Science     Open Access   (Followers: 22)
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: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
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: 146)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 20)
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: 42)
Chemistry of Materials     Full-text available via subscription   (Followers: 246)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 10)
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)
Clay Minerals     Full-text available via subscription   (Followers: 10)
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: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 19)
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: 11)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 3)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 6)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 18)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 64)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
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: 3)
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  

        1 2 3 | Last

Journal Cover Chemistry - An Asian Journal
  [SJR: 1.833]   [H-I: 75]   [15 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1861-4728 - ISSN (Online) 1861-471X
   Published by John Wiley and Sons Homepage  [1589 journals]
  • [(18-crown-6)K][Fe(1)Cl(1)4]0.5[Fe(2)Cl(2)4]0.5: A Multifunctional
           Molecular Switch of Dielectric, Conductivity and Magnetism
    • Authors: Yuan-Bo Tong; Zheng-Fang Tian, Hai-Bao Duan, Zhong-Peng Zhu, Wei He, Tian-Yu Hong, Gui Yu, Yu-Jian He, Jing-Kui YANG
      Abstract: Multifunctional materials that exhibit different physical properties in a single phase have potential for use in multifunctional devices. Herein, we reported an organic-inorganic hybrid compound [(18-crown-6)K][Fe(1)Cl(1)4]0.5[Fe(2)Cl(2)4]0.5 (1) by incorporating KCl and FeCl3 into the 18-crown-6 molecular which acts as a host of the six O atoms affording lone-pair electrons to anchor the guest potassium cation, and [FeCl4]- as a counter ion for charge balance to construct a complex salt. This salt exhibited a one-step reversible structural transformation to give two separate high and low temperature phases at 373 K, which was confirmed by systematic characterizations including differential scanning calorimetry (DSC) measurements, variable-temperature structural analyses, and dielectric, impedance, variable-temperature magnetic susceptibility measurements. Interestingly, the structural transformation was coupled to both hysteretic dielectric phase transition, conductivity switch and magnetic phase transition at 373 K. This novel result gives an idea for designing a new type of phase-transition materials harbouring technologically important magnetic, conductivity and dielectric properties.
      PubDate: 2018-01-22T03:20:42.135515-05:
      DOI: 10.1002/asia.201701794
       
  • Amorphous Materials for Enhanced Localized Surface Plasmon Resonances
    • Authors: Chuanhui Zhu; Qun Xu
      Abstract: The discovery of localized surface plasmon resonances (LSPR) in semiconductor nanocrystals has initiated a new field in plasmonics. And plasmonic nanocrystals of crystal materials have gained rapid development in the past years with a class of materials with unique photoelectronic properties. Present now a growing number of amorphous plasmonic materials are steadily capturing scientific interest of people, though only a few are well-characterized. Here, we focus on the recent development in state-of-the art experiments, and explore the vast library of plasmonic properties in amorphous materials, including their application fields and optical spectral range. Taken together, the growing regime of amorphous material plasmonics offers enticing avenues for harnessing light-matter interactions from the visible to terahertz region, with new optical manipulation beyond what can be accomplished using traditional crystal materials.
      PubDate: 2018-01-19T03:31:01.473864-05:
      DOI: 10.1002/asia.201701722
       
  • [CH3NH3]4Ga4SbS9S0.28O0.72H: A Three-Dimensionally Open-Framework
           Heterometallic Chalcogenidoantimonate Exhibiting Ni2+ Ion-Exchange
           Property
    • Authors: Bo Zhang; Wei-An Li, Yi-Yu Liao, Chen Zhang, Mei-Ling Feng, Xiao-Ying Huang
      Abstract: An open-framework chalcogenidoantimonate, namely, [CH3NH3]4Ga4SbS9S0.28O0.72H (1), has been solvothermally synthesized and structurally characterized. Interestingly, 1 showed Ni2+ ion-exchange properties and wide pH resistance, with a maximum exchange capacity of 76.9 mg/g. To the best of our knowledge, this is the first example of amine-directed three-dimensional (3D) heterometallic chalcogenidometalates for the highly selective Ni2+ ion capture with the high distribution coefficient (Kd = 1.65 × 105 mL/g).
      PubDate: 2018-01-18T10:55:23.933194-05:
      DOI: 10.1002/asia.201701763
       
  • Ruthenium Catalyzed Aerobic Oxidation of Amines
    • Authors: Debabrata Maiti; Goutam Kumar Lahiri, Ritwika Ray, Arijit Singha Hazari
      Abstract: Amine oxidation is one of the fundamental reactions in organic synthesis since it leads to a variety of value-added products like oximes, nitriles, imines and amides among many others. These products comprise the key N-containing building blocks in modern chemical industry, and such transformations when achieved in presence of molecular oxygen without using stoichiometric oxidants, are much preferred since they circumvent the production of unwanted wastes. In parallel, versatility of ruthenium catalysts in various oxidative transformations is well-documented. Herein, the review focuses on aerobic oxidation of amines using ruthenium catalysts in specific and highlights the major achievements in this direction and challenges that still need to be addressed.
      PubDate: 2018-01-18T09:00:47.840675-05:
      DOI: 10.1002/asia.201701748
       
  • Synthesis of Histidine-Containing Oligopeptides via Histidine-Promoted
           Peptide Ligation
    • Authors: Kai-Jin Huang; Yi-Chen Huang, Yuya Angel Lin
      Abstract: Histidine-containing peptides are valuable therapeutic agents for treatment of neurodegenerative diseases. However, the synthesis of histidine-containing peptides is not trivial due to the potential of imidazole sidechain of histidine to act as a nucleophile if unprotected. A peptide ligation method utilizing the imidazole sidechain of histidine has been developed. The key imidazolate intermediate that acts as an internal acyl transfer catalyst during ligation is generated by deprotonation. Transesterification with amino acids or peptides tethered with C-terminal thioester followed by N to N acyl shifts led to the final ligated products. A range of histidine-containing dipeptides could be synthesized in moderate to good yields via this method without protecting the imidazole sidechain. The protocol was further extended to tripeptide synthesis via a long-range N to N acyl transfer, and tetrapeptide synthesis.
      PubDate: 2018-01-18T08:25:24.773899-05:
      DOI: 10.1002/asia.201701802
       
  • Alloying in an Intercalation Host: Metal Titanium Niobates as Anodes for
           Rechargeable Alkali-Ion Batteries
    • Authors: Suman Das; Diptikanta Swain, Rafael B. Araujo, Songxin Shi, Rajeev Ahuja, Tayur N. Guru Row, Aninda J. Bhattacharyya
      Abstract: Alloying in a layered host is reported as a chemical design strategy for developing anodes for alkali-based batteries. The Al3+/Pb2+/Sb3+/Ba2+/Mg2+ cations present in the interlayer galleries of a layered metal titanium niobate electrochemically alloy with intercalated lithium or sodium ions. Volume changes associated with the alloying reaction are completely tackled by the chemical composition and flexible nature of the layered host. This synergistic approach combining intercalation and alloying mechanisms holds potential for the development of improved electrodes for different types of battery chemistry. More information can be found in the Full Paper by Tayur N. Guru Row, Aninda J. Bhattacharyya et al.
      PubDate: 2018-01-18T07:56:23.985384-05:
      DOI: 10.1002/asia.201701812
       
  • Welcome to the New Editorial Board Members
    • Abstract: We warmly welcome our new Editorial Board members Matthias Bickelhaupt, Sally Brooker, Xiaoming Feng, Mikiko Sodeoka, and Takafumi Ueno.
      PubDate: 2018-01-18T06:45:40.960965-05:
      DOI: 10.1002/asia.201800081
       
  • Laccase-Catalyzed Synthesis of Low-Molecular-Weight Lignin-Like Oligomers
           and Their Application as UV-Blocking Materials
    • Authors: Jieyan Lim; Barindra Sana, Ranganathan Krishnan, Jayasree Seayad, Farid J. Ghadessy, Satyasankar Jana, Balamurugan Ramalingam
      Abstract: The Cover Feature illustrates a laccase-catalyzed oligomerization of guaiacol and its analogues, utilizing oxygen as an oxidant, with a representative mode of chain growth by dehydrogenative C−C coupling. The promising UV blocking characteristics of the oligomers is represented as an umbrella blocking the UV rays from the sun. The UV spectra show the differences in the absorption behavior of monomeric vanillyl alcohol and its oligomer. The natural or bio-derived oligomers could be sustainable alternatives to conventional synthetic UV stabilizers and attractive to coating, food packaging, and sunscreen industries. These oligomeric UV blockers are less vulnerable to leaching from formulated polymers or plastics owing to their larger size. More information can be found in the Full Paper by Balamurugan Ramalingam, Satyasankar Jana et al.
      PubDate: 2018-01-18T06:45:22.81634-05:0
      DOI: 10.1002/asia.201800046
       
  • A self-growing strategy for large-scale crystal assembly tubes
    • Authors: Huizeng Li; Mingzhu Li, Qiang Yang, Xiaoli Sun, Bo Guan, Yanlin Song
      Abstract: Assembled tubular materials have attracted widespread attention due to their potential applications in catalysis, bionics, and optic-electronics. Many versatile methods, including template-assistance and self-assembly, have been developed for tubular materials fabrication. Here we demonstrate a self-growing strategy to prepare large-scale crystal assembly tubes. Addition of the template and the need for the sophisticated equipment are avoided with this method. The sidewall of the tubes composes of a layer of polyhedral crystals that are connected together through grain coalescence. We demonstrate that the assembled tubular structure is obtained by the synergetic effect of the passivation layer and the dissolution-recrystallization process. This facile one-step strategy and the formation mechanism will offer guidance for fabrication of new superstructures.
      PubDate: 2018-01-18T04:25:35.530983-05:
      DOI: 10.1002/asia.201800044
       
  • Supramolecular Gels Derived from the Salts of Variously substituted
           Phenylacetic Acid and Dicyclohexyl Amine: Design, Synthesis, Structures
           and Dye Adsorption
    • Authors: Parthasarathi Dastidar; Rajdip Roy, Tapas Kumar Adalder
      Abstract: A well-studied supramolecular synthon namely secondary ammonium monocarboxylate (SAM) was exploited to generate a new series of organic salts derived from variously substituted phenylacetic acid (PA) and dicyclohexyl amine (DCA) as potential low molecular weight gelators (LMWGs). As much as 25% of the SAM salts under study were gelators. The gels were characterized by rheology and the morphology of the gel networks was studied by high resolution electron microscopy. Single crystal and powder X-ray diffraction data were employed to study structure-property (gelation) correlation. One of the gels could adsorb a hydrophobic dye (Nile red) more efficiently than a hydrophilic dye (Calcein) from DMSO which might provide useful clue towards developing stain removing gels.
      PubDate: 2018-01-18T00:55:53.404765-05:
      DOI: 10.1002/asia.201701632
       
  • Different Atomic Terminations Associated Photocatalytic Nitrogen Fixation
           of Bismuth Oxybromide: A First Principles Study
    • Authors: Hongxian Liu; Zhenxing Fang, Yongfei Su, Yuanli Suo, Shuping Huang, Yongfan Zhang, Kaining Ding
      Abstract: We have systematically investigated the electronic structures and activation capacities of BiOBr {001} facets with different atomic terminations by means of DFT methods. Our calculations reveal that oxygen vacancies (OVs) give a significant boost in band edges of the O-terminated BiOBr {001} facets, and excess electrons induced by OVs could exceed the reduction potentials of high-energy N2 intermediates. Interestingly, the Bi-terminated BiOBr {001} facets may be good candidates for photocatalytic nitrogen fixation due to the stronger activation ability of N2 molecules comparing with O-terminated BiOBr {001} facets with OVs. Moreover, the Bi-terminated BiOBr {001} facets may tend to yield NH3 instead of N2H4.
      PubDate: 2018-01-17T13:25:22.047285-05:
      DOI: 10.1002/asia.201701670
       
  • Bifunctional fluorescent probe for sequential sensing thiols and primary
           aliphatic amines in distinct fluorescence channels
    • Authors: Lingliang Long; Meiyu Huang, Ning Wang, Xiangqi Yuan, Siyu Cao, Aihua Gong, Kun Wang
      Abstract: Thiols and primary aliphatic amines (PAA) are ubiquitous and extremely important species in biological system. They have performed significant interplaying roles in complex biological events. A single fluorescent probe differentiating both thiol and PAA can contribute to understanding the intrinsic inter-relationship of thiols and PAA in biological processes. Herein, we rationally constructed the first fluorescent probe that can respond to thiols and PAA in different fluorescence channels. The probe exhibited high selectivity and sensitivity to thiols and PAA. In addition, it displayed sequential sensing ability when the thiols and PAA were coexisted. The application experiment indicated that the probe can be used for sensing thiols and PAA in human blood serum. Moreover, the fluorescence imaging of endogenous thiols and PAA as well as antihypertensive drugs captopril and amlodipine in living cells were successfully conducted.
      PubDate: 2018-01-17T01:50:25.162552-05:
      DOI: 10.1002/asia.201701733
       
  • Block Copolymer Self-Assembly in Solution—Quo Vadis'
    • Authors: Johannes C. Brendel; Felix H. Schacher
      Abstract: The developments in block copolymer self-assembly over the last five years have appeared like navigating a sensitive labyrinth by carefully adjusting various parameters, but also facing several pitfalls. Nevertheless, researchers around the world have made tremendous progress in terms of understanding the underlying assembly pathways or utilizing kinetic obstacles. Herein, the key developments made in these fields are highlighted, such as pathways to impart further hierarchy into solution-borne nanostructures or novel step-wise and dynamic processes. More information can be found in the Focus Review by Johannes C. Brendel and Felix H. Schacher.
      PubDate: 2018-01-16T10:10:22.169279-05:
      DOI: 10.1002/asia.201800055
       
  • Integrating TEMPO or Its Analogues with Visible Light Photocatalysis
    • Authors: Xianjun Lang; Jincai Zhao
      Abstract: Visible light has risen to be a very important facilitator for selective radical reactions enabled by well-cognized photocatalysts. The renaissance of visible light photocatalysis on this matter partly relies on integrating it with other area of catalysis. In parallel, TEMPO, a quintessential persistent radical, has a wide range of uses due to its exceptional redox behavior, giving rise to its latest prominence in catalysis. Therefore, integrating the catalysis of TEMPO with photocatalysis to carry out visible light-induced selective reactions becomes very convenient marriage of merits. In this context, the integration of different types of photocatalysts including metal complexes, metal-free organic dyes and semiconductors with TEMPO for outstanding organic transformations will be summarized separately. To further expand the catalytic repertoire, the integration of TEMPOH analogues such as NHPI (N-hydroxyphthalimide) or NHS (N-hydroxysuccinimide) with photocatalysis will also be discussed in different sections. Hopefully, these advances could pave the way for more breakthroughs by integrating TEMPO and its analogues with photocatalysis, leading to a valuable blueprint for visible light-induced selective organic transformations.
      PubDate: 2018-01-16T07:55:33.80113-05:0
      DOI: 10.1002/asia.201701765
       
  • Synthesis of Functionalized (η5-Indenyl)rhodium(III) Complexes and Their
           Application to C-H Bond Functionalization
    • Authors: Jyunichi Terasawa; Yu Shibata, Yuki Kimura, Ken Tanaka
      Abstract: It has been established that reductive complexation of functionalized benzofulvenes, which are readily prepared from commercially available indene and 2-methylindene, with RhCl3 in ethanol affords the corresponding indenyl-rhodium(III) dichlorides bearing substituents at the 1- (H or CO2Et), 2- (H or Me), and 3- [CH2Ph or CH2(2-MeOC6H4)] positions. The thus obtained indenyl-rhodium(III) complexes bearing one ethoxycarbonyl group showed higher thermal stability and regioselectivity than our previously reported CpERhIII complex toward the oxidative [3+2] annulation of acetanilides with internal alkynes.
      PubDate: 2018-01-16T05:51:11.818887-05:
      DOI: 10.1002/asia.201701716
       
  • Prussian Blue Derived FeP Nanoparticles in Porous Graphene Aerogel as
           Efficient Electrocatalysts for Hydrogen Evolution Reaction
    • Authors: Narendra Kumar Alam Venugopal; Shuli Yin, Yinghao Li, Hairong Xue, You Xu, Xiaonian Li, Hongjing Wang, Liang Wang
      Abstract: Tailoring of new hydrogen evolution reaction (HER) electrocatalyst with earth abundant elements is important for large scale water splitting and hydrogen production. In this work, we present a simple synthetic method for incorporating iron phosphide (FeP) particles into three-dimensional (3D) porous graphene aerogel (GA) structure. The FeP formed in porous 3D GA (FeP/GA) is derived from electroactive Fe hexacyanoferrate (FeHCF). The advantage of incorporating FeP, in the porous 3D graphene network enables high accessibility for HER. As synthesized FeP/GA catalyst shows good electrocatalytic activity for HER in both acidic and alkaline solutions. The developed method can be useful for synthesizing metal hexacyanoferrate derived mono/bimetal phosphide catalyst in porous 3D graphene aerogels.
      PubDate: 2018-01-16T04:22:21.725789-05:
      DOI: 10.1002/asia.201701616
       
  • Pomegranate-Structured Silica/Sulfur Composite Cathodes for High
           Performance Lithium-Sulfur Batteries
    • Authors: Soojin Park; Sinho Choi, Dawei Su, Myoungsoo Shin, Guoxiu Wang
      Abstract: Porous materials have many structural advantages for energy storage and conversion devices such as rechargeable batteries, supercapacitors, and fuel cells. When applied as a host material in lithium-sulfur batteries, porous silica materials with a pomegranate-like architecture can not only act as a buffer matrix for accommodating a large volume change of sulfur, but also suppress the polysulfide shuttle effect. The porous silica/sulfur composite cathodes exhibit excellent electrochemical performances including a high specific capacity of 1450 mA h g-1, a reversible capacity of 82.9 % after 100 cycles at a rate of C/2 (1 C = 1672 mA g-1) and an extended cyclability over 300 cycles at 1 C-rate. Furthermore, the high polysulfide adsorption property of porous silica has been proven by ex-situ analyses, showing a relationship between the surface area of silica and polysulfide adsorption ability. In particular, the modified porous silica/sulfur composite cathode, which is treated by a deep-lithiation process in the first discharge step, exhibits a highly reversible capacity of 94.5 % at 1C-rate after 300 cycles owing to a formation of lithiated-silica frames and stable solid-electrolyte-interphase layers
      PubDate: 2018-01-14T21:50:59.975915-05:
      DOI: 10.1002/asia.201701759
       
  • Solvent Impedes CO2 Cycloaddition on Metal-Organic Frameworks
    • Authors: Dan Shao; Jinbiao Shi, Jianling Zhang, Xiuniang Tan, Tian Luo, Xiuyan Cheng, Bingxing Zhang, Buxing Han
      Abstract: The catalytic performance of metal-organic frameworks (MOFs) for the synthesis of cyclic carbonate from carbon dioxide and epoxides has been explored in solvent and solvent-free conditions, respectively. It was found that MOF catalysts have significantly improved catalytic activities in solvent-free CO2 cycloaddition reactions than those in solvent. The mechanism was discussed from the competition of solvent with substrate to adhere MOF catalysts during reaction process.
      PubDate: 2018-01-13T11:25:21.252143-05:
      DOI: 10.1002/asia.201701706
       
  • In Situ Growth of MnO2 Nanosheets on N-Doped Carbon Nanotubes Derived from
           Polypyrrole Tubes for Supercapacitors
    • Authors: Xu Ou; Qi Li, Dan Xu, Jiangna Guo, Feng Yan
      Abstract: Nitrogen-doped porous carbon nanotubes@MnO2 (N-CNTs@MnO2) nanocomposites are prepared through the in situ growth of MnO2 nanosheets on N-CNTs derived from polypyrrole nanotubes (PNTs). Benefiting from the synergistic effects between N-CNTs (high conductivity and N doping level) and MnO2 nanosheets (high theoretical capacity), the as-prepared N-CNTs@MnO2-800 nanocomposites show a specific capacitance of 219 F g-1 at a current density of 1.0 A g-1, which is higher than that of pure MnO2 nanosheets (128 F g-1) and PNTs (42 F g-1) in 0.5 M Na2SO4 solution. Meanwhile, the capacitance retention of 86.8 % (after 1000 cycles at 10 A g-1) indicates an excellent electrochemical performance of N-CNTs@MnO2 prepared in this work.
      PubDate: 2018-01-13T00:26:44.309569-05:
      DOI: 10.1002/asia.201701752
       
  • Syntheses and properties of meso-substituted porphyrin mesogens with
           triazole linkages and peripheral alkyl chains
    • Authors: Ruilin Zhang; Hongfei Gao, Yanming Ren, Yulong Xiao, Jinliang Hu, Xiaohong Cheng
      Abstract: Novel discotic mesogens P/n-M (n = 12, 16, 18, M = 2H, Zn and Cu) bearing a porphyrin core, triazole linkages and peripheral 3,4,5-trialkoxybenzyl units have been synthesized by "click chemistry" approach. The thermal behavior, photophysical properties and morphologies of these compounds were investigated by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), UV and PL spectra, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). These compounds can self-assemble into hexagonal columnar phases in their pure states and form organogels in 1,4-dioxane with unusually flower-like sphere morphology. The supramolecular complexes of P/18-Zn with C70 or 4,7-di-4-pydriyl-2,1,3-benzothadiazole can display hexagonal columnar phases too. Additionally, zinc porphyrin compounds P/n-Zn show binding selectivity to Cu2+ among a series of cations in THF-H2O solution.
      PubDate: 2018-01-12T10:21:28.911748-05:
      DOI: 10.1002/asia.201701666
       
  • Copper-Catalyzed Oxidative Reaction of β-Keto Sulfones with Alcohols via
           C−S Bond Cleavage: Reaction Development and Mechanism Study
    • Authors: Bingnan Du; Wenmin Wang, Yang Wang, Zheng-Hang Qi, Jiaqi Tian, Jie Zhou, Xiaochen Wang, Jianlin Han, Jing Ma, Yi Pan
      Abstract: A Cu-catalyzed cascade oxidative radical process of β-keto sulfones with alcohols has been achieved by using oxygen as an oxidant. In this reaction, β-keto sulfones were converted into sulfinate esters under the oxidative conditions via cleavage of C-S bond. Experimental and computational studies demonstrate that a new pathway is involved in this reaction, which proceeds through the formation of the key four-coordinated Cu(II) intermediate, O−O bond homolysis induced C−S bond cleavage and Cu-catalyzed esterification to form the final products. This reaction provides a new strategy to sulfonate esters and enriches the research contend of the C−S bond cleavage and transformations.
      PubDate: 2018-01-12T10:20:24.481444-05:
      DOI: 10.1002/asia.201701694
       
  • Synthesis of hollow mesoporous TiO2 microspheres with single and double Au
           nanoparticles layers for enhanced visible light photocatalysis
    • Authors: Zia Ur Rahman; Ning Wei, Yange Feng, Xiaolong Zhang, Daoai Wang
      Abstract: A facile method was used to prepare hollow mesoporous TiO2 and Au@TiO2 spheres using polystyrene (PS) templates. Au nanoparticles (NPs) were simultaneously synthesized and attached on the surface of PS spheres by reducing AuCl4- ions using sodium citrate which resulted in the uniform deposition of Au NPs. The outer coating of titania via sol-gel produced PS@Au@TiO2 core-shell spheres. Removing the templates from these core-shell spheres through calcination produced hollow mesoporous and crystalline Au@TiO2 spheres with Au NPs inside the TiO2 shell in a single step. Anatase spheres with double Au NPs layers, one inside and another outside of TiO2 shell, were also prepared. Different characterization techniques indicated the hollow mesoporous and crystalline morphology of the prepared spheres with Au NPs. Hollow anatase spheres with Au NPs indicated enhanced harvesting of visible light and therefore demonstrated efficient catalytic activity toward the degradation of organic dyes under the irradiation of visible light as compared to bare TiO2 spheres.
      PubDate: 2018-01-12T08:30:41.096913-05:
      DOI: 10.1002/asia.201701786
       
  • Aerobic photooxidative synthesis of β-alkoxy mono-hydroperoxides using an
           organo photoredox catalyst controlled by a base
    • Authors: Yuya Asano; Yoshitomo Nagasawa, Eiji Yamaguchi, Akichika Itoh
      Abstract: In the proposed study, transition-metal-free synthesis of β-alkoxy monohydroperoxides via aerobic photooxidation using an acridinium photocatalyst was developed. This method enables the synthesis of some novel hydroperoxides. The peroxide source is molecular oxygen, which is cost-effective and is atomically efficient. Magnesium oxide plays an important role as a base in the catalytic system.
      PubDate: 2018-01-12T03:50:40.659556-05:
      DOI: 10.1002/asia.201701742
       
  • Constructing ordered three-dimensional channels of TiO2 for enhanced
           visible-light photo-catalytic performance of CO2 conversion induced by Au
           nanoparticles
    • Authors: Hairong Xue; Tao Wang, Hao Gong, Hu Guo, Xiaoli Fan, Bin Gao, Yaya Feng, Xianguang Meng, Xianli Huang, Jianping He
      Abstract: As a typical photo-catalyst for CO2 reduction, the practical application of TiO2 still suffers from low photo-catalytic efficiency and limited visible light absorption. Here, a novel Au-nanoparticle (NP)-decorated ordered mesoporous TiO2 (OMT) composite (OMT-Au) was successfully fabricated, in which Au NPs uniformly disperse on the OMT. Due to the surface plasmon resonance (SPR) effect derived from the excited Au NPs, TiO2 possesses high photo-catalytic performance for CO2 reduction under visible light. The ordered mesoporous exhibits the superiority of material and structure. This ordered mesoporous structure of TiO2 with a high surface area offers more catalytic activity sites. More importantly, the three-dimensional transport channels ensures smooth flow of gas molecules, high-efficient adsorption ability of CO2, and the fast and steady transmission of hot electrons excitation on Au NPs, thus leading to further improving photo-catalytic performance. These results highlight the possibility of improving visible light photo-catalysis for CO2 reduction by constructing OMT-based Au-SPR-induced photo-catalysts.
      PubDate: 2018-01-11T09:21:11.264686-05:
      DOI: 10.1002/asia.201701807
       
  • Imine-based architectures at surfaces and interfaces: from self-assembly
           to dynamic covalent chemistry in 2D
    • Authors: Iwona Janica; Violetta Patroniak, Paolo Samorì, Artur Ciesielski
      Abstract: During the last two decades dynamic covalent chemistry (DCC) has emerged as an efficient and versatile strategy for the design and synthesis of complex molecular systems in solution. While early examples of supramolecularly assisted covalent synthesis at surfaces relied strongly on kinetically controlled reactions for post-assembly covalent modification, the DCC method takes advantage of the reversible nature of bond formation and allows the generation of the new covalently bonded structures under thermodynamic control. These structurally complex architectures obtained via DCC protocols offer a wealth of solutions and opportunities towards the generation of new complex materials holding sophisticated properties. In this Focus Review we focus on the formation of covalently bonded imine-based discrete nanostructures, as well as one-dimensional (1D) and two-dimensional (2D) covalent organic frameworks (COFs) physisorbed on solid substrates under various experimental conditions, e.g. under ultra-high vacuum (UHV) or at the solid/liquid interface. Scanning tunneling microscopy (STM) is used to gain insight, with a sub-nanometer resolution, into the structure and properties of those complex nanopatterns.
      PubDate: 2018-01-11T09:20:36.456564-05:
      DOI: 10.1002/asia.201701629
       
  • Alkylation-, Heating-, and Doping-Induced Emission Enhancement of a
           Polyaromatic Tube in the Solid State
    • Authors: Kiyonori Kuroda; Masafumi Otsuki, Kohei Yazaki, Yoshihisa Sei, Munetaka Akita, Michito Yoshizawa
      Abstract: A polyaromatic tube with a subnanometer-sized cavity was efficiently prepared on a gram-scale through the stereo-controlled cyclotrimerization of a diphenylanthracene derivative as a key step. The facile exterior alkylation of the polyaromatic framework leads to a moderately fluorescent tube (R = -OC10H21; ΦF = 20%) in the solid state. The emission intensity of the solid-state alkyl-substituted tube is remarkably enhanced upon heating (up to 1.6 times, ΦF = 31%) as well as doping with fluorescent dyes (up to 4.2 times, ΦF = 83%) through efficient energy transfer.
      PubDate: 2018-01-11T05:31:36.211324-05:
      DOI: 10.1002/asia.201800034
       
  • Cobalt-Doped Perovskite-type Oxide LaMnO3 as Bifunctional Oxygen Catalysts
           for Hybrid Lithium-Oxygen Batteries
    • Authors: Xiao Liu; Hao Gong, Tao Wang, Hu Guo, Li Song, Wei Xia, Bin Gao, Zhongyi Jiang, Linfei Feng, Jianping He
      Abstract: Perovskite-type oxides based on alkaline-earth containing lanthanum manganate are the promising catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline electrolyte. The perovskite-type LaMnO3 shows excellent ORR performance but poor OER activity. In order to improve OER performance of LaMnO3, the element Co is doped into the perovskite-type LaMnO3 via a sol-gel method with following calcination process. To assess electrocatalytic activities for ORR and OER, a series of prepared LaMn1-xCoxO3 (x = 0, 0.05, 0.1, 0.2, 0.3, 0.4 and 0.5) perovskite oxides were synthesized. The results indicate that the amount of doped Co has a significant effect on the catalytic performance of LaMn1-xCoxO3. As researched, when x = 0.3, LaMn0.7Co0.3O3 not only shows a tolerable electrocatalytic activity for ORR, but also exhibits a great improvement (> 200 mV) on the catalytic activity for OER, indicating the doping of Co is an effective approach to improve the OER performance of LaMnO3. Furthermore, the results demonstrate that the LaMn0.7Co0.3O3 is a promising bifunctional catalyst with cost-effective, applied and high-performance for ORR and OER in the hybrid Li-O2 batteries.
      PubDate: 2018-01-10T07:56:26.102662-05:
      DOI: 10.1002/asia.201701561
       
  • Synthesis of Metallic Nanoparticles Using Closed-Shell Structures as
           Templates
    • Authors: Li Qiu; Ryan McCaffrey, Wei Zhang
      Abstract: The synthesis and study of metallic nanoparticles are of continued and significant interest, with applications in materials science, catalysis, and medicine. The properties of metallic nanoparticles depend strongly on their particle size, shape, and interparticle distances. It is therefore desirable for the synthesis of metallic nanoparticles to be controlled for specific shapes and sizes. The rapid development in this research area has attracted intense interest from researchers with diverse expertise, and numerous methods towards the synthesis of monodisperse nanoparticles have been reported. In this Focus Review, we provide an overview of recent progress in the development of the template synthesis of metallic nanoparticles using closed-shell structures, including biological molecules/assemblies and cage molecules.Shell game: The properties of metallic nanoparticles depend strongly on their particle size, shape, and interparticle distances. It is therefore desirable to be able to control the synthesis towards specific shapes and sizes of metallic nanoparticles. This Focus Review provides an overview of recent progress in the development of the template synthesis of metallic nanoparticles using closed-shell structures, including biological molecules/assemblies and cage molecules (see figure).
      PubDate: 2018-01-10T07:26:17.359449-05:
      DOI: 10.1002/asia.201701478
       
  • Highly Luminescent and Water-Soluble Two-Dimensional Supramolecular
           Organic Framework: All Organic Photosensitizer Template for Visible Light
           Driven Hydrogen Evolution from Water
    • Authors: Hyun-Jun Lee; Hyeong-Ju Kim, Eung-Chang Lee, Jaekwan Kim, Soo Young Park
      Abstract: A highly fluorescent (ΦF = 0.60) and water-soluble two-dimensional (2D) honeycomb-shaped supramolecular organic framework (SOF) was successfully synthesized in pure aqueous solution via self-assembly of novel cyanostilbene-functionalized trilateral guest molecules and cucurbit[8]uril hosts. Size of this fluorescent 2D SOF was over 500 nm in diameter, 1.7 nm in thickness, and 3.9 nm in the honeycomb pore diameter. This 2D SOF showed a promising potential as a new all-organic photosensitizer template for photocatalytic H₂ evolution from pure water.
      PubDate: 2018-01-10T02:55:39.077009-05:
      DOI: 10.1002/asia.201800020
       
  • Transformations in Chemically Responsive Copper-Calixarene Architectures
    • Authors: Edmundo Percástegui; Carlos Reyes-Mata, Marcos Flores-Alamo, Beatriz Quiroz-García, Ernesto Rivera, Ivan Castillo
      Abstract: Self-assembly of bis-picolyl-appended calix[4]arene (L) with Cu(I) or Cu(II) salts resulted in a collection of multinuclear architectures capable of expressing structural reconfigurations in response to various chemical stimuli: addition of copper salt, solvents, or oxidation. Coordination of L to CuX (X = Br, I) selectively yielded dinuclear macrocycles Cu(I)₂L₂Br₂ (1) and Cu(I)₂L₂I₂ (3) that were transformed into tetranuclear assemblies Cu(I)₄L₂Br₄ (2) and Cu(I)₄L₂I₄ (4) upon further addition of CuX. These supramolecules persist as robust and discrete entities in solution that display red emission; notably, 4 exhibits luminescence thermochromism. Assembly of L with CuCl₂ produced macrocycle Cu(II)₂L₂Cl₄ (5), which crystallised as cage [Cu(II)₂L₄(μ-Cl)]³+ (6) in the presence of MeOH. Two chemical signals -introduction of CuCl₂ and addition of CH₃CN- regenerated macrocycle 5. Coordination of L with Cu(OTf) yielded macrocycle Cu(I)₂L₂(OTf)₂ (7) that also crystallised as cage 6 upon oxidation in CHCl₃.
      PubDate: 2018-01-09T09:50:24.684208-05:
      DOI: 10.1002/asia.201701741
       
  • Formation of fluorinated amido esters through unexpected C3-C4 bond
           fission in 4-trifluoromethyl-3-oxo-β-lactams
    • Authors: Hang Dao Thi; Hannelore Goossens, Dietmar Hertsen, Valerie Otte, Tuyen Van Nguyen, Veronique Van Speybroeck, Matthias D'hooghe
      Abstract: 4-Trifluoromethyl-3-oxo-β-lactams were unexpectedly transformed into 2-[(2,2-difluorovinyl)amino]-2-oxoacetates as major products, accompanied by minor amounts of 2-oxo-2-[(2,2,2-trifluoroethyl)amino]acetates, upon treatment with alkyl halides and triethylamine in DMSO. This peculiar C3-C4 bond fission reactivity was investigated in-depth, from both an experimental and a computational point of view, in order to shed light on the underlying reaction mechanism.
      PubDate: 2018-01-09T09:20:46.551704-05:
      DOI: 10.1002/asia.201701636
       
  • In situ generated ruthenium catalytic systems bearing diverse
           N-heterocyclic carbene precursors for the atom-economic amide synthesis
           from alcohols and amines
    • Authors: Hua Cheng; Mao-Qian Xiong, Chuan-Xiang Cheng, Hua-Jing Wang, Qiang Lu, Hong-Fu Liu, Fu-Bin Yao, Francis Verpoort, Cheng Chen
      Abstract: The transition-metal-catalyzed direct amide synthesis from alcohols and amines has been demonstrated as a highly environmental-benign and atom-economic process. Among various catalytic systems, in situ generated N-heterocyclic carbene (NHC)-based ruthenium (Ru) halide catalytic systems have been testified to be active for this attractive transformation. However, these existing catalytic systems usually required an additional ligand to achieve satisfactory results. In this work, through extensive screening from a diverse variety of NHC precursors, we discovered an active in situ catalytic system for the efficient amide synthesis without any additional ligand. Notably, this catalytic system is insensitive to the electronic effects of the substrates, and various electron-deficient substrates, which were not highly reactive with our previous catalytic systems, could be employed to efficiently afford the corresponding amides. Furthermore, mechanistic investigations were performed to demonstrate the rational for the high activity of the optimized catalytic system. The NMR scale reactions indicated that the rapid formation of a Ru hydride intermediate (a peak at -7.8 ppm from 1H NMR) after the addition of the alcohol substrate should be a pivotal factor for manifesting the high catalytic activity. Besides, HR-MS analysis demonstrated the possible structures of the in situ generated catalytic system.
      PubDate: 2018-01-09T09:20:33.190107-05:
      DOI: 10.1002/asia.201701734
       
  • Visible-Light-Promoted Synthesis of 1,4-Dicarbonyl Compounds via Conjugate
           Addition of Aroyl Chlorides
    • Authors: Chao-Ming Wang; Dan Song, Peng-Ju Xia, Jing Wang, Hao-Yue Xiang, Hua Yang
      Abstract: A facile visible-light photocatalytic conjugate addition to prepare 1,4-dicarbonyl compounds has been developed by employing readily available aroyl chlorides as aryl radical sources. This operationally simple method shows broad scope with regard to both aroyl chlorides and Michael acceptor. As a result, a variety of 1,4-diketones were efficiently synthesized in moderate to good yields.
      PubDate: 2018-01-08T23:50:46.414045-05:
      DOI: 10.1002/asia.201701738
       
  • Carbon Dots: Bottom-Up Syntheses, Properties, and Light-Harvesting
           Applications
    • Authors: Yuri Choi; Yeongkyu Choi, Oh-Hoon Kwon, Byeong-Su Kim
      Abstract: The development of cost-effective and environmentally friendly photocatalysts and photosensitizers has received tremendous attention because of their potential utilization in solar harvesting applications. In this respect, carbon dots (CDs) prepared by bottom-up methods have been considered to be promising light-harvesting materials. Through preparation from various molecular precursors and synthetic methods, CDs exhibit excellent optical and charge transfer properties. Furthermore, their photophysical properties can be readily optimized and enhanced by doping, functionalization, and post-synthetic treatment. In this review, we summarize the recent progress regarding CDs synthesized using bottom-up approaches that exhibit strong light absorption and unique electron donor/acceptor capabilities for light-harvesting applications. We anticipate that this review will provide new insights into novel types of photosensitizers and photocatalysts for a wide range of applications.
      PubDate: 2018-01-08T01:50:35.302531-05:
      DOI: 10.1002/asia.201701736
       
  • Hydrogen-doping into MoO3 supports toward modulated metal-support
           interactions and efficient furfural hydrogenation on iridium nanocatalysts
           
    • Authors: Lifang Xie; Ting Chen, Hang Cheong Chan, Yijin Shu, Qingsheng Gao
      Abstract: As promising supports, reducible metal oxides afford strong metal-support interactions to achieve efficient catalysis, relying on their band states and surface stoichiometry. Herein, in-situ and controlled hydrogen doping (H-doping) via H2 spillover is employed to engineer the metal-support interactions in hydrogenated MoOx supported Ir (Ir/H-MoOx) catalysts, and thus promote furfural hydrogenation to furfuryl alcohol. Via facilely varying reduction temperature, the resulting H-doping in a controlled manner tailors low-valence Mo species (Mo5+ and Mo4+) on H-MoOx supports, and thus charge-redistribution on Ir and H-MoOx interfaces. This further leads to obvious difference in H2 chemisorption on Ir, showing the promise for catalytic hydrogenation. As expected, the optimal Ir/H-MoOx with controlled H-doping affords high activity (TOF: 4.62 min-1) and selectivity (> 99%) in furfural hydrogenation at a mild condition (T = 30 oC, PH2 = 2 MPa), performing among the best of current catalysts.
      PubDate: 2018-01-05T05:55:35.281174-05:
      DOI: 10.1002/asia.201701661
       
  • Metal-Catalyzed C−H Bond Activation of 5-Membered Carbocyclic Rings: A
           Powerful Access to Azulene, Acenaphthylene and Fulvene Derivatives
    • Authors: Xinzhe Shi; Arpan Sasmal, Jean-François Soulé, Henri Doucet
      Abstract: Azulene, acenaphthylene and fulvene derivatives exhibit important physical properties useful in materials chemistry as well as valuable biological properties. The metal-catalyzed functionalization of such compounds, via C−H bond activation of their 5-membered carbocyclic ring, proved to be convenient for the synthesis of their derivatives, and the progress in this area is summarized in the Focus Review by Jean-François Soulé, Henri Doucet et al.
      PubDate: 2018-01-05T04:06:04.669959-05:
      DOI: 10.1002/asia.201701813
       
  • Large-scalable Preparation of Photochromic Composite Foils with Excellent
           Reversibility for Light Printing
    • Authors: Yijie Zhou; Aibin Huang, Shidong Ji, Huaijuan Zhou, Ping Jin, Rong Li
      Abstract: Photochromic inks for repeatable light printing media have attracted increasing attention owing to the fact that it may be widely applied to reduce the consumption of papers and plastics for environmental conservation. Therefore, it is of practical significance to develop convenient photochromic inks at a low cost in a large scale. In this study, a simple one-step hydrothermal way was employed to prepare tungsten trioxide (WO3) nanoparticles which was further used to make photochromic inks and transparent photochromic films. The obtained transparent photochromic film could rapidly respond to UV light within tens of seconds, return to its initial state corresponding to different recovering time at each temperature and meanwhile exhibit good reversible coloration-bleaching effect. A typical PET foil coated with the photochromic ink can also be repeatedly light-printed for various patterns and display fabulous rewritable performance for tens of times. To sum up, this study proposes a simple method for the widespread applications of WO3-based photochromic inks.
      PubDate: 2018-01-05T03:25:20.553292-05:
      DOI: 10.1002/asia.201701747
       
  • Water oxidation catalysis beginning with CuCo2S4: investigation of the
           true electrochemically driven catalyst
    • Authors: Xiaoqiang Du; Xiaoshuang Zhang, Zhi Yang, Yaqiong Gong
      Abstract: Exploitation of efficient and stable water oxidation catalyst is pressing to solve the energy crisis. In this communication, the flower-like CuCo2S4 microspheres is successfully synthesized and used as an effective water oxidation catalyst. CuCo2S4/NF affords an electrocatalytic water oxidation activity with a current density of 20 mA cm-2 at a low overpotential of 260 mV. The overpotential value is lower than that of benchmark RuO2/NF (overpotential 340mV at current density of 20 mA cm-2). The water oxidation activity increases linearly before nonlinearly improving with the increasing of pH, indicating that the substrate changes from water to hydroxyl. The CuCo2S4/NF is demonstrated to be a real water oxidation catalyst based on diverse experiments.
      PubDate: 2018-01-04T04:05:12.474758-05:
      DOI: 10.1002/asia.201701684
       
  • Hierarchical nanoboxes composed of Co9S8-MoS2 nanosheets as efficient
           electrocatalysts for hydrogen evolution reaction
    • Authors: Vinoth Ganesan; Sunghyun Lim, Jinkwon Kim
      Abstract: Development of hydrogen evolution catalysts based on non-precious metals is essential for the practical application of water-splitting devices. Here, we report the synthesis of Co9S8-MoS2 hierarchical nanoboxes (HNBs) as efficient catalysts for hydrogen evolution reaction (HER). The surface of the hollow cubic structure was organized by CoMoS4 nanosheets formed by the reaction of MoS42- and Co2+ released from the Co-zeolite imidazole framework (ZIF-67) templates under reflux condition in a water-ethanol mixed solvent. The formation process of CoMoS4 HNB structures was characterized by TEM images obtained at various reaction temperatures. The amorphous CoMoS4 hierarchical nanoboxes were converted by sequential heat treatments to CoSx-MoS2 and Co9S8-MoS2 HNBs. Owing to their unique chemical compositions and structural features, Co9S8-MoS2 HNBs have high specific surface area (124.6 m2 g-1) and superior electrocatalytic performances for HER. The Co9S8-MoS2 HNBs exhibit a low overpotential (η10) of 106 mV, a low Tafel slope of 51.8 mV dec-1 and long-time stability in an acidic medium. The electrocatalytic activity of Co9S8-MoS2 HNBs is superior to the recently reported values and proves to be a promising candidate for HER.
      PubDate: 2018-01-01T06:15:26.462354-05:
      DOI: 10.1002/asia.201701536
       
  • Rational design of [13C,D14]tert-butylbenzene as a scaffold structure for
           designing long-lived hyperpolarized 13C probes
    • Authors: Yuki Imakura; Hiroshi Nonaka, Yoichi Takakusagi, Kazuhiro Ichikawa, Nesmine Maptue, Alexander Funk, Chalermchai Khemtong, Shinsuke Sando
      Abstract: Dynamic nuclear polarization (DNP) is a technique to polarize the nuclear spin population. As a result of the hyperpolarization, NMR sensitivity of the nuclei in molecules can be enhanced dramatically. Recent application of the hyperpolarization technique has led to advances in biochemical and molecular studies. A major problem is the short lifetime of the polarized nuclear spin state. Generally, in solution, the polarized nuclear spin state decays to a thermal spin equilibrium, resulting in loss of the enhanced NMR signal. This decay is correlated directly with the spin-lattice relaxation time T1. Here we report [13C,D14]tert-butylbenzene as a new scaffold structure for designing hyperpolarized 13C probes. Thanks to the minimized spin-lattice relaxation (T1) pathways, its water-soluble derivative showed a remarkably long 13C T1 value and long retention of the hyperpolarized spin state.
      PubDate: 2017-12-31T21:50:44.843914-05:
      DOI: 10.1002/asia.201701652
       
  • A small molecule Pin1 inhibitor blocks NF-κB signaling in prostate
           cancer cells
    • Authors: Ke-Jia Wu; Hai-Jing Zhong, Guanjun Yang, Chun Wu, Jie-Min Huang, Guodong Li, Dik-Lung Ma, Chung-Hang Leung
      Abstract: Prolyl-isomerase 1 (Pin1) is a conserved enzyme that regulates cell processes such as cell cycle progression, transcriptional regulation, and apoptosis. However, overexpression of Pin1 is correlated with a higher probability of prostate tumor recurrence. We utilized molecular docking technique to identify Pin1 inhibitors from a database of natural product and natural product-like compounds. The action of the hit compounds against Pin1 activity was studied using multiple methods, including a fluorimetric enzymatic assay, co-immunoprecipitation, western blotting, cell thermal shift and other techniques. We have identified compound 1 as a natural product-like inhibitor of Pin1 activity via structure-based virtual screening and showed that compound 1 could target Pin1 and disrupt the interaction between Pin1 and the p65 subunit of NF-κB in cells. Furthermore, compound 1 reduced nuclear p65 (Thr254) phosphorylation and attenuated NF-κB activity in cells. Finally, compound 1 induced apoptosis in prostate cancer cells. Compound 1 represents a natural product-like Pin1 inhibitor that acts via targeting the Pin1-NF-κB interaction.
      PubDate: 2017-12-30T00:30:45.46122-05:0
      DOI: 10.1002/asia.201701216
       
  • Recent Progress of Upconversion in Nanostructured Materials: From Optical
           Tuning to Biomedical Applications
    • Authors: Feng Wang; Tianying Sun, Fujin Ai, Guangyu Zhu
      Abstract: Photon upconversion that is characterized by high-energy photon emission followed by lower-energy excitation was conventionally studied in bulk materials for several decades. The unique nonlinear luminescence process has become a subject of great attention since 2000 when upconverted emission was demonstrated in nanostructured crystals. In comparison with their bulk counterparts, nanostructured materials provide more rooms for optical fine-tuning by allowing flexible compositional integration and structural engineering. Moreover, the high colloidal stability of nanoparticles coupled with high amenability to surface functionalization opens up a number of new applications for upconversion, especially in the fields of biology and life science. In this focus review, we discuss recent development of upconversion materials through nanostructural design and review emerging biomedical applications involving these nanostructured upconversion materials. We also attempt to highlight challenging problems of these nanomaterials that constrain further progress in utilizing upconversion processes.
      PubDate: 2017-12-29T04:25:22.115896-05:
      DOI: 10.1002/asia.201701660
       
  • Catalytic water oxidation by iridium-modified carbonic anhydrase
    • Authors: Min-Chul Kim; Sang-Yup Lee
      Abstract: Carbonic anhydrase (CA) is a ubiquitous metalloenzyme with a Zn cofactor coordinated with trigonal histidine imidazole moieties in a tetrahedral geometry. Removal of the Zn cofactor in CA and subsequent binding of Ir afforded CA[Ir]. Under mild and neutral conditions (30 °C, pH 7), CA[Ir] exhibited water-oxidizing activity with a turnover frequency (TOF) of 39.8 min-1, comparable to those of other Ir-based molecular catalysts. Coordination of Ir to the apoprotein of CA is thermodynamically preferred and is associated with an exothermic energy change (ΔH) of −10.8 kcal/mol, implying that the CA apoprotein is stabilized by Ir binding. The catalytic oxygen-evolving activity of CA[Ir] is displayed only when Ir is bound to CA that functions as an effective biological scaffold that activates Ir center for the catalysis. The outcomes of this study indicate that the histidine imidazoles at the CA active site could be exploited as a beneficial biological ligand to provide unforeseen biochemical activity by coordination to a variety of transition metal ions.
      PubDate: 2017-12-28T10:25:30.0768-05:00
      DOI: 10.1002/asia.201701543
       
  • Silver-Catalyzed Efficient Synthesis of Oxindoles and Pyrroloindolines
           Using α-Aminoalkylation as the Key Step
    • Authors: Kyalo Stephen Kanyiva; Sohei Makino, Takanori Shibata
      Abstract: α-Aminoalkylation of N-arylacrylamides with amino acid derivatives was achieved by silver-catalysis in moderate to high yields. The reaction provides a new and efficient strategy for the synthesis of functionalized oxindoles, and is suitable for a wide range of both N-arylacrylamides and amino acids, which are inexpensive and readily available. The obtained oxindoles were readily transformed into densely functionalized pyrroloindolines by deprotection and cyclization in one pot.
      PubDate: 2017-12-28T09:57:20.034064-05:
      DOI: 10.1002/asia.201701739
       
  • High Crystalline Prussian White Nanocubes as a Promising Cathode for
           Sodium-ion Batteries
    • Authors: Cong Li; Rui Zang, Pengxin Li, Zengming Man, Shijian Wang, Yuhan Wu, Shuaishuai Liu, Guoxiu Wang
      Abstract: Prussian blue and its analogues (PBAs) have been recognized as one of the most promising cathode materials for room temperature sodium-ion batteries (SIBs). Herein, we report highly crystalline and Na-rich Prussian white Na2CoFe(CN)6 nanocubes synthesized by an optimized and facile co-precipitation method. The influence of crystallinity and sodium content on the electrochemical properties was systematically investigated. The optimized Na2CoFe(CN)6 nanocubes exhibited an initial capacity of 151 mA h g-1, which is close to its theoretical capacity (170 mA h g-1). Meanwhile, the Na2CoFe(CN)6 cathode demonstrated an outstanding long-term cycle performance, retaining 78% of its initial capacity after 500 cycles. Furthermore, the Na2CoFe(CN)6 Prussion white nanocubes also achieved superior rate capability (115 mA h g-1 at 400 mA g-1, 92 mA h g-1 at 800 mA g-1). The enhanced performances could be attributed to the robust crystal structure and rapid transport of Na+ ions through large channels in the open-framework. Most noteworthy, the as-prepared Na2CoFe(CN)6 nanocubes not only are low-cost in raw materials but also contain a rich sodium content (1.87 Na+ ions per lattice unit cell), which will be favorable for full cell fabrication and large-scale electric storage applications.
      PubDate: 2017-12-27T11:25:24.361793-05:
      DOI: 10.1002/asia.201701715
       
  • Alloying in an Intercalation Host: Metal Titanium Niobates as Anodes for
           Rechargeable Alkali-Ion Batteries
    • Authors: Aninda Jiban Bhattacharyya; Suman Das, Diptikanta Swain, Tayur N. Guru Row, Rajeev Ahuja, Rafael B. Araujo, Songxin Shi
      Abstract: We discuss here a unique flexible non-carbonaceous layered host viz. metal titanium niobates, M-Ti-niobate (Ti: Titanium; M: Al3+, Pb2+, Sb3+, Ba2+, Mg2+) which can synergistically store both lithium-ions and sodium-ions via simultaneous intercalation and alloying mechanisms. M-Ti-niobate is formed by ion-exchange of the K+-ions, which are specifically located inside galleries between the layers formed by edge and corner sharing TiO6 and NbO6 octahedral units in the sol-gel synthesized potassium titanium niobate (KTiNbO5). Drastic volume changes (approximately 300-400%) typically associated with alloying mechanism of storage are completely tackled chemically by the unique chemical composition and structure of the M-Ti-niobates. The free space between the adjustable Ti/Nb octahedral layers easily accommodates the volume changes. Due to the presence of an optimum amount of multivalent alloying metal ions (50-75% of total K+) in the M-Ti-niobate, efficient alloying reaction takes place directly with ions and completely eliminates any form of mechanical degradation of the electroactive particles. The M-Ti-niobate can be cycled over a wide voltage range (as low as 0.01 V) and displays remarkably stable Li+ and Na+ ion cyclability (> 2 Li+/Na+ per formula unit) for widely varying current densities over few hundreds to thousands of successive cycles. The simultaneous intercalation and alloying storage mechanisms is also studied within the density functional theory (DFT) framework. DFT expectedly shows a very small variation in the volume of Al-titanium niobate following lithium alloying. Moreover, the theoretical investigations also conclusively endorse the occurrence of the alloying process of Li-ions with the Al-ions along with the intercalation process during discharge. The M-Ti-niobates studied here demonstrates a paradigm shift in chemical design of electrodes and will pave the way for development of multitude of improved electrodes for different battery chemistries.
      PubDate: 2017-12-27T06:52:04.632982-05:
      DOI: 10.1002/asia.201701602
       
  • Photooxidation of A Twisted Isoquinolinone
    • Authors: Qichun Zhang; Gang Li, Jianfeng ZHAO, shufan yang, yongxin Li, Rakesh Ganguly
      Abstract: Understanding the oxidation mechanism and positions of twistacenes and twistheteroacenes under ambient conditions is very important because such knowledges can guide us to design and synthesize more novel large stable analogues. Herein, we demonstrated that a twisted isoquinolinone can decompose under oxygen and light at room temperature for the first time. The as-decomposed product 1 was fully characterized through conventional methods as well as single-crystal structure analysis. Moreover, the physical properties of the as-obtained product were carefully investigated and the possible formation mechanism was proposed.
      PubDate: 2017-12-24T22:00:22.391167-05:
      DOI: 10.1002/asia.201701674
       
  • In situ synthesis of 3D flower-like nanocrystalline Ni/C and its effect on
           hydrogen storage properties of LiAlH4
    • Authors: Lei Zang; Song Liu, Huinan Guo, Xiaoya Chang, Xiangqian Xu, Lifang Jiao, Huatang Yuan, Yijing Wang
      Abstract: Lithium alanate (LiAlH4) is of particular interest as one of the most promising candidates for solid-state hydrogen storage. Unfortunately, high dehydrogenation temperatures, relatively slow kinetics limit its practical applications. Herein, 3D flower-like nanocrystalline Ni/C composed of highly dispersed Ni nanoparticles and interlaced carbon flakes was synthesized in-situ. The as-synthesized nanocrystalline Ni/C significantly decreased the dehydrogenation temperature and dramatically improved the dehydrogenation kinetics of LiAlH4. It is found that the LiAlH4-10wt%Ni/C sample starts hydrogen desorption at ~48 °C, which is very close to the ambient temperature. Approximately 6.3 wt% H2 is released from the LiAlH4-10wt%Ni/C within 60 min at 140 °C, whereas pristine LiAlH4 only releases 0.52 wt% H2 under identical conditions. More importantly, the dehydrogenated products can partially rehydrogenate at 300 °C and under 4 MPa H2. The synergetic effect of the flower-like carbon substrate and Ni active species contributes to the significantly reduced dehydrogenation temperatures and improved kinetics.
      PubDate: 2017-12-23T10:10:27.053016-05:
      DOI: 10.1002/asia.201701649
       
  • Dibenzothieno-pyrrolo[3,2-b]pyrrole - the Missing Member of Thienoacenes
           Family
    • Authors: Daniel T Gryko; Małgorzata Czichy, Mariusz Tasior, Mieczysław Łapkowski
      Abstract: Dibenzothieno-pyrrolo[3,2-b]pyrrole and the corresponding bis(S,S-dioxide) were synthesised using concise synthetic strategy. Despite the presence of six fused aromatic rings, π-expanded pyrrolo[3,2-b]pyrroles of this type absorb and emit at relatively short wavelengths, which reflects inefficient π-conjugation due to the angular arrangement of aromatic rings. They exhibit interesting and complex electrochemical behavior, highlighting their potential in organic electronics. Both heteroacenes undergo two-stage oxidation, while remaining the independence of each 1-phenyl-1H-[1]benzothieno[3,2-b]pyrrole, which was proved by in situ ESR measurements. Interestingly, electrochemically generated dicationdiradicals are not only distributed over the pyrrolo[3,2-b]pyrrole scaffold, but also over the phenyl substituents located on nitrogen atoms.
      PubDate: 2017-12-22T10:10:27.222767-05:
      DOI: 10.1002/asia.201701639
       
  • Nickel-Catalyzed Heck-Type Monofluoroacetation of Styrenes for Facile
           Synthesis of Allylic Fluorides
    • Authors: Xi-Sheng Wang; Zhen-Yu Wang, Jia-Hao Wan, Gao-Yin Wang, Ruo-Xing Jin, Quan Lan
      Abstract: An efficient nickel-catalyzed Heck-type reaction between styrenes and fluoroalkyl iodine has been developed. This novel transformation has demonstrated broad substrate scope, mild reaction conditions and excellent E-stereoselectivity. This efficient synthetic method has been applied into the late-stage monofluoroacetation of biologically active molecules. Mechanistic investigations indicate that a monofluoroalkyl radical is involved in the catalytic cycle.
      PubDate: 2017-12-21T10:10:58.670114-05:
      DOI: 10.1002/asia.201701655
       
  • Redox-Active Peptide Functionalized Quinquethiophene Based Electrochromic
           π-Gel
    • Authors: Apurba K Das; Maruthi Konda, Sayan Maity, Rohit G Jadhav
      Abstract: Here, we report an electrochromic system based on self-assembled dipeptide appended redox active quinquethiophene π-gel. The designed peptide-quinquethiophene consists of a symmetric bolaamphiphile that has two segments: a redox active π-conjugated quinquethiophene core for electrochromism and peptide-motif for the involvement of molecular self-assembly. Investigations reveal that self-assembly and electrochromic properties of the π-gel are strongly dependent on the relative orientation of peptidic and quinquethiophene scaffolds in the self-assembling system. The colors of the π-gel film are very stable with fast and controlled switching speed at room temperature.
      PubDate: 2017-12-21T08:11:31.309646-05:
      DOI: 10.1002/asia.201701460
       
  • Mild-Base-Promoted Arylation of (Hetero)Arenes with Anilines
    • Authors: Diego Manuel Monzón; Tanausú Santos, Fernando Pinacho-Crisóstomo, Víctor Sotero Martín, Romen Carrillo
      Abstract: Transition metal-free radical arylation of heteroarenes is achieved at room temperature by simply adding aqueous sodium carbonate to a solution of the corresponding heteroarene and arenediazonium salt, which can even be formed in situ. Such an easy, inexpensive and mild methodology has been optimized and applied to the expeditious modification of interesting molecular cores like naphthylimide or bisthienylcyclopentenes.
      PubDate: 2017-12-21T07:43:30.684957-05:
      DOI: 10.1002/asia.201701585
       
  • Applicability Evaluation of a Bright Green Emitting Carbon dots in Solid
           States for White Light Emitting Diodes
    • Authors: Deyin Wang; Waheed U.Khan, Zuobin Tang, Yuhua Wang
      Abstract: A self-quenching-resistant and bright green emitting carbon dots (CDs) in solid state is synthesized via a facile hydrothermal method. Their structure, optical properties together with their thermal and photo-stabilities, as well as their applicability in white LEDs are investigated. The obtained CDs have nearly spherical shape with size around 4~5 nm. The resulting powder CDs show excitation-independent emission behavior, and can be excited over a broad range from 300-450 nm. Under optimal excitation at 400 nm, the resultant powder CDs yield bright and broad green emission around 505 nm with full width at half maximum (FWHM) about 110 nm. Time resolved and temperature dependent luminescence spectra suggest that the luminescence origin of the resulting CDs is one single species. The potential application of the green emitting CDs is evaluated by constructing a white light-emitting diodes lamp. The fabricated white LEDs lamp emitted bright warm white light with excellent color rendering properties (a color rendering index of 86.9 and correlated color temperature of 3863 K ).
      PubDate: 2017-12-19T00:50:41.682973-05:
      DOI: 10.1002/asia.201701548
       
  • Visible-light-driven efficient photocatalytic reduction of organic azides
           to amine over CdS sheet-rGO nanocomposite
    • Authors: Subhash Chandra Ghosh; Aniruddha Mondal, Subhash Chandra Ghosh, Asit Baran Panda
      Abstract: CdS sheet-rGO nanocomposite as heterogeneous photocatalyst enables visible light induced photocatalytic-reduction of aromatic, heteroaromatic, aliphatic and sulfonyl azides to the corresponding amines using hydrazine hydrate as a reductant. The reaction shows excellent conversion and chemoselectivity towards the formation of the amine without self-photoactivated azo compounds. In the adopted strategy, CdS not only accelerate the formation of nitrene through photo-activation of azide but also enhance the decomposition of azide to a certain extent which entirely suppressed the azo compound formation. The developed catalyst CdS sheet-rGO nanocomposite is very active to provide excellent results under 40W simple household CFL lamp.
      PubDate: 2017-12-19T00:35:54.761753-05:
      DOI: 10.1002/asia.201701614
       
  • Graphene Based Inverted Planar Perovskite Solar Cells: Advancements,
           Fundamental Challenges and Prospects
    • Authors: Konstantinos Petridis; George Kakavelakis, Minas Stylianakis, Emmanuel Kymakis
      Abstract: Metal halide based perovskite solar cells are considered among the most promising photovoltaic technologies already presenting certified efficiencies surpassing 22%. The high performance and the low fabrication cost, makes this technology competitive with state-of-the-art thin film photovoltaics. However perovskite solar cells present some striking disadvantages hindering their commercialization, including low operational lifetimes, high toxicity and hysteresis effect, which lower both the performance, and long term stability of the devices. In this focus review article, we summarize the work that has been done within the last two years regarding the addressing of challenges of low temperature processed planar inverted PSCs, using graphene based materials. In addition, we discuss the critical challenges and the prospects of this field and propose some prospects for future research directions.
      PubDate: 2017-12-18T05:03:35.020885-05:
      DOI: 10.1002/asia.201701626
       
  • Highlights on the Road towards Highly Emitting Solid-State Luminophores:
           Two Classes of Thiazole-Based Organoboron Fluorophores with the AIEE/AIE
           Effect
    • Authors: Kseniya Lugovik; Alexander Eltyshev, Polina Suntsova, Pavel Slepukhin, Enrico Benassi, Nataliya P. Belskaya
      Abstract: Abstract: Developing a novel, small-sized molecular building block that may be capable of emitting light in the solid state is a challenging task and has rarely been reported in the literature. BF2-containing dyes seem to be promising candidate towards this aim. Two series of new N^NBF2-complexes showing aggregation-induced emission (AIE) and aggregation-induced emission enhancement (AIEE) were designed and synthesized via a new protocol, which improves on the traditional method by employing microwave irradiation. The optical and photophysical properties of the BF2 complexes were investigated in depth. The synthesized complexes showed fluorescence in both solution and the solid state and, in a THF/water mixture, may aggregate into fluorescent nanoparticles. The experimental investigation was supported by quantum mechanical calculations. Their availability, stability, large Stokes shifts and aggregation capabilities, along with their solid-state emission capability, render this new class of BF2-complexes promising AIEE/AIE fluorophores for further applications in the fields of fluorescence imaging and material sciences.
      PubDate: 2017-12-14T08:35:44.943278-05:
      DOI: 10.1002/asia.201701526
       
  • Iron-Catalyzed Aminative Cyclization/Intermolecular Homolytic Aromatic
           Substitution Using Oxime Esters and Simple Arenes
    • Authors: Takuya Shimbayashi; Kazuhiro Okamoto, Kouichi Ohe
      Abstract: Intermolecular C-H alkylation of simple arenes in the presence of an iron catalyst has been achieved in a cascade manner with an aminative cyclization triggered by N-O bond cleavage of an alkene-tethered oxime ester. Various arenes, including electron-rich and electron-poor arenes, and heteroarenes can be employed in the reaction system. Regioselectivity and radical trapping experiments support the involvement of alkyl radical species, which undergo a homolytic aromatic substitution (HAS) to afford the arylation products.
      PubDate: 2017-12-13T21:42:15.412883-05:
      DOI: 10.1002/asia.201701634
       
  • Block Copolymer Self-Assembly in Solution - Quo vadis'
    • Authors: Felix Helmut Schacher; Johannes Brendel
      Abstract: The desire for increasing complexity while maintaining control over every aspect of the process itself - this might be used as a provocative description of the developments in block copolymer self-assembly in solution over the last decade. The community has witnessed tremendous progress, not only with regard to the design of building blocks, but also in terms of understanding assembly pathways, interfacial properties, or kinetic obstacles. In particular, the latter can be of interest (and actually turned into an advantage), if structures are targeted, which are not in thermodynamic equilibrium. Within this focus review, we try to highlight the key developments and trends that we identified during the last five years: the development of step-wise and dynamic processes, different means to impart further hierarchy into solution-borne nanostructures, and a partial shift in focus towards gradient and bottlebrush block copolymers.
      PubDate: 2017-12-11T04:22:57.787833-05:
      DOI: 10.1002/asia.201701542
       
  • Surfactant-dependent charge transfer between polyoxometalate and
           single-walled carbon nanotubes: a fluorescence spectroscopic study
    • Authors: Liu Hong; Naotoshi Nakashima, Yunxing Li, Hongbing Jia, Cheng Yang
      Abstract: Hybridizations of redox-active polyoxometalates (POMs) with single-walled carbon nanotubes (SWNTs) have been widely investigated for their diverse applications. For the purpose of constructing high quality electronic devices, controlling the charge transfer within POM/SWNTs hybrid is an inevitable issue. By means of fluorescence spectroscopy, we demonstrate the electron transfer between SWNTs and a common POM dopant phosphomolybdic acid (PMo12) can be tuned simply by an alteration of nanotube surfactant type from anionic to non-ionic. The mechanism is attributed to the influence of surfactant type on the stabilization of electron donor-acceptor hybrid and effect of surfactant-nanotube interaction. Our results will be important to control charge transport behavior in nanohybrids consisted of carbon nanotubes.
      PubDate: 2017-12-11T00:15:49.84646-05:0
      DOI: 10.1002/asia.201701558
       
  • Diketopyrrolopyrrole-based and tetracyano-bridged small molecules for bulk
           heterojunction organic solar cells
    • Authors: Rajneesh Misra; Rajneesh Misra
      Abstract: The research on bulk heterojunction (BHJ) organic solar cells (OSCs) is rapidly growing from the past two decades and the device performance has reached power conversion efficiency over 13%. In this minireview we have highlighted the design strategies used for the development of diketopyrrolopyrrole (DPP) and tetracyano based molecular donors. We have also described how tetracyano bridged non-fullerene acceptors can be developed by click type [2+2] cycloaddition-retroelectrocyclization reaction of acetylene bridged small molecule with tetracyanoethylene (TCNE) by simple modification.
      PubDate: 2017-12-08T07:26:21.118043-05:
      DOI: 10.1002/asia.201701493
       
  • Laccase-catalyzed synthesis of low molecular weight lignin-like oligomers
           and their application as UV blocking materials
    • Authors: Balamurugan Ramalingam; Jieyan Lim, Ranganathan Krishnan, Jayasree Seayad, Barindra Sana, Farid John Ghadessy, Satyasankar Jana
      Abstract: Laccase-catalyzed oxidative polymerization of monomeric and dimeric lignin model compounds was carried out using oxygen as oxidant in aqueous medium. The oligomers were characterized by gel permeation chromatography (GPC) and matrix assisted laser desorption ionisation time-of-flight mass spectroscopy (MALDI-TOF-MS) analysis. The oxidative polymerization leads to the formation of oligomeric species with a number average molecular weight (Mn) ranging between 700-2300 Da with low polydispersity index. Spectroscopic analysis provided insight into the possible modes of linkages present in the oligomers and the oligomerization is likely to proceed through the formation of C-C linkages between phenolic aromatic rings. The oligomers were found to show good ultraviolet (UV) light absorption characteristics with high molar extinction coefficient (5000-38000 M-1cm-1) in the UV spectral region. The oligomers were blended independently with polyvinyl chloride (PVC) by solution blending. Ultraviolet visible (UV-Vis) transmittance spectra of the oligomer embedded PVC films indicated that these lignin-like oligomers possess notable UV light blocking ability. In particular, the oligomers obtained from vanillyl alcohol and dimeric lignin model was found to show good photostability by accelerated UV weathering experiments. The UV blocking characteristics and photostabilty were finally compared with the low molecular weight commercial UV stabilizer 2,4-dihydroxybenzophenone.
      PubDate: 2017-12-06T22:11:34.510904-05:
      DOI: 10.1002/asia.201701573
       
  • Self-Complementary Dimers of Oxalamide-Functionalized Resorcinarene
           Tetrabenzoxazines
    • Authors: Kari Rissanen; Mario Cetina, Zoran Dzolic, Ngong Kodiah Beyeh, Lotta Turunen
      Abstract: Self-complementarity is a useful concept in supramolecular chemistry, molecular biology and polymeric systems. Two resorcinarene tetrabenzoxazines decorated with four oxalamide groups are synthesized and characterized. The oxalamide groups possessed self-complementary hydrogen bonding sites between the carbonyls and amide groups. The self-complementary nature of the oxalamide groups resulted in self-included dimeric assemblies. The hydrogen bonding interactions within the tetrabenzoxazines give rise to the formation of dimers, which are confirmed by single crystal X-ray diffractions analysis and supported by NMR spectroscopy and mass spectrometry. The self-included dimers are linked by numerous and strong intermolecular interactions, forming one-dimensional polymers, which are then further linked into three-dimensional networks.
      PubDate: 2017-12-05T05:00:50.084867-05:
      DOI: 10.1002/asia.201701426
       
  • Synthesis of new monofunctionalized silsesquioxanes (RSiMe2O)(i-Bu)7Si8O12
           via alkene hydrosilylation
    • Authors: Marcin Walczak; Adrian Franczyk, Bogdan Marciniec
      Abstract: In presented herein research hydrosilylation of a widespectrum of alkenes containing one or more reactive groups with(HSiMe2O)(i-Bu)7Si8O12 (1), catalyzed by a different type of catalystsis characterized in details. For the first time, special attention hasbeen devoted to the influence of the alkene, catalyst, as well as thereaction conditions on the process effectiveness and selectivenessby the precise monitoring of the experiments with in situ FT-IR aswell as NMR spectroscopies. More than twenty, mostly newsilsesquioxanes bearing commonly used in organic and polymerchemistry reactive groups (OH, Br, NR2, CO, COOR, NCO, epoxy,SiR3) were obtained, isolated and characterized by 1H, 13C, 29Si NMRand MALDI TOF. Importantly, in the presented synthesescommercially available reagents and catalysts were used, so thepresented methods could be easily repeated, rapidly scaled up andwidely applied.
      PubDate: 2017-12-01T07:06:11.373353-05:
      DOI: 10.1002/asia.201701569
       
  • A Library of Multi-purpose Supramolecular Supergelators: Fabrication of
           Structured Silica, Porous Plastics and Fluorescent Gel
    • Authors: Kana M Sureshan; Baiju P Krishnan
      Abstract: Supramolecular gels find application in various fields. Usually a specific gelator is useful only for a specific application. This one-gelator-one-application format is one of the limiting factors in expanding the horizon of the supramolecular gels. We report the synthesis of a library of gelators from a common core. Thus, β-azido-4,6-O-benzylidene-galactopyranoside on click reaction with various alkynes gave 11 different gelators having varying gelation abilities. While gelators having alkyl chain substituents congealed alkanes and TEOS, the gelators having aromatic substituents congealed aromatic solvents. We have exploited this difference in gelling behaviour in templated synthesis of silica rods and porous plastics. We have also developed a fluorescent gelator 2f by this method, which might find applications in virtue of its fluorescence in assembled state.
      PubDate: 2017-11-30T04:42:37.324079-05:
      DOI: 10.1002/asia.201701657
       
  • Semiconductor-based Photoelectrochemical Conversion of Carbon Dioxide:
           Stepping Towards Artificial Photosynthesis
    • Authors: Hong Pang; Takuya Masuda, Jinhua Ye
      Abstract: Photoelectrochemical CO2 reduction process stands out as a promising avenue for conversion of the solar energy to chemical feedstocks among the various methods for CO2 mitigation. Semiconductors derived from cheap and abundant elements are interesting candidates for catalysis. Whether employed as intrinsic semiconductor or hybridized with metallic cocatalysts, biocatalysts and metal molecular complex, semiconductor photocathodes exhibit good performance and low overpotential during the CO2 reduction. Apart from focusing on CO2 reduction materials and chemistry, photoelectrochemical cells towards standalone device using photohybrid electrode or solar cells have also been a hot topic in recent research. An overview of the state-of-the-art progress in photoelectrochemical CO2 reduction is presented and a deep understanding of the catalysts of CO2 reduction will also be given.
      PubDate: 2017-11-28T03:46:08.097172-05:
      DOI: 10.1002/asia.201701596
       
  • Polyoxometalate and resin-derived P-doped Mo2C@N-carbon as highly
           efficient hydrogen evolution reaction catalyst in all pH
    • Authors: Gang Yan; Xiao-Jia Feng, Shifa-Ullah Khan, Li-Guang Xiao, Wen-Guang Xi, Hua-Qiao Tan, Yuan-Yuan Ma, Lu-Nan Zhang, Yang-Guang Li
      Abstract: A new type of P-doped Mo2C coated by N-carbon (P-Mo2C@NC) has been successfully prepared by calcining polyoxometalates H3[PMo12O40] (POMs) and urea-formaldehyde resin mixture at N2 atmosphere. Urea-formaldehyde resin not only serves as the carbon source to ensure the carbonization, but also facilitates the uniform distribution of POM precursors, which efficiently avoid the aggregation of Mo2C particles at high temperature. TEM reveals that the average diameter of Mo2C particle is about 10 nm, which is coated by few-layer N-doped carbon sheet. The as-prepared P-Mo2C@NC displayed excellent HER performance and long-term stability in all pH. To reach the current density of 10 mA cm-2, only 109 mV, 159 mV and 83 mV needed for P-Mo2C@NC in 0.5 M H2SO4 (pH = 0), 0.1 M phosphate buffer (pH = 7) and 1 M KOH (pH = 14), respectively. This work provides a high-yield and low-cost method to prepare uniform nanosized molybdenum carbides with highly efficient and stable HER performance.
      PubDate: 2017-11-28T00:40:26.68086-05:0
      DOI: 10.1002/asia.201701400
       
  • Experimental and theoretical study of enhanced photocatalytic activity of
           Mg-doped ZnO NPs and ZnO/rGO nanocomposites
    • Authors: Ramin Yousefi; Javad Beheshtian, Seyedeh Mozhgan Seyed-Talebi, H.R. Azimi, Farid Jamali-Sheini
      Abstract: Abstract: A systematic experimental and theoretical study of the origin of the enhanced photocatalytic performance of Mg-doped ZnO nanoparticles (NPs) and Mg-doped ZnO/reduced-graphene-oxide (rGO) nanocomposites were investigated. In addition to Mg, Cd was chosen as a doping material for band-gap engineering of ZnO NPs, which its effects were compared with that of Mg concerning the photocatalytic performance of ZnO nanostructures. Experimental results showed that Mg, as a doping material, recognizably ameliorated the photocatalytic performance of ZnO NPs and ZnO/graphene nanocomposites. Transmission electron microscope (TEM) images showed that, Mg-doped and Cd-doped ZnO NPs had the same size. Optical properties of the samples indicated that Cd narrowed the band-gap, while Mg widened the band-gap of ZnO NPs as well as oxygen vacancy concentration was similar in both samples. Based on the experimental results, the narrowing of the band-gap, particle size, and oxygen vacancy did not enhance the photocatalytic performance. However, Brunauer−Emmett−Teller (BET) and Barret-Joyner-Halenda (BJH) models showed that, Mg caused increase textural properties of the samples, while rGO played opposite role. The theoretical study, conducted via the density functional theory (DFT) method, proved that the improvement in the photocatalytic performance of Mg-doped ZnO NPs was due to the higher electron transfer from the Mg-doped ZnO NPs to dye molecule, comparisons to the pristine ZnO and Cd-doped ZnO NPs. Moreover, according to the experimental results, along with Mg, graphene also had an important role as far as the photocatalytic performance of ZnO is concerned.
      PubDate: 2017-11-27T15:40:23.157889-05:
      DOI: 10.1002/asia.201701423
       
  • Simple Organic Salts Having Naphthalenediimide (NDI) Core Displaying
           Multi-functional Properties: Gelation, Anti-cancer and Semiconducting
           Properties
    • Authors: Parthasarathi Dastidar; Rumana Parveen, Nabasmita Maity
      Abstract: Following a supramolecular synthon rationale a dicarboxylic acid derivative having naphthalenediimide (NDI) core namely bis-N-carboxymethyl naphthalenediimide (NDI-A) was reacted with n-alkyl amines having varying alkyl chain length to generate a new series of primary ammonium dicarboxylate (PAD) salts. Majority of the salts (~85%) were found to gel various polar solvents. The gels were characterized by dynamic rheology and high resolution electron microscopy. Single crystal and powder X-ray diffraction were employed to study the supramolecular synthon present in one of the gelator salts namely S8. Charge-transfer (CT) induced gelation with donor molecules such as anthracene methanol (Ant) and pyrene (Py) was also possible with S8. The CT complex (S8.Ant) displayed anticancer activity as probed by cell migration assay on a highly aggresive breast cancer cell line MDA-MB-231. The DMSO gel of S8.Ant also displayed semiconducting behaviour. To the best of our knowledge, simple organic salts having NDI core displaying such mulitifunctional properties are hitherto unknown.
      PubDate: 2017-11-23T06:25:57.681686-05:
      DOI: 10.1002/asia.201701559
       
  • Metal-catalyzed C-H bond functionalization of 5-membered carbocyclic
           rings: A powerful access to azulenes, acenaphthylenes and fulvenes
           derivatives
    • Authors: Xinzhe Shi; Arpan Sasmal, Jean-Francois Soulé, Henri Doucet
      Abstract: Azulenes, acenaphthylenes and fulvenes derivatives exhibit important physical properties useful in material chemistry and also biological properties. Since a two decades, the metal-catalyzed functionalization of such compounds, via the C-H bond activation of their 5-membered carbocyclic ring, proved to be a very convenient method for the synthesis of a wide variety of azulene, acenaphthylene and fulvene derivatives. For such reactions, there is no need to prefunctionalize the 5-membered carbocyclic rings. In this review, the progress in the synthesis of azulene, acenaphthylene and fulvene derivatives via the metal-catalyzed C-H bond activation of their 5-membered carbocyclic ring are summarized.
      PubDate: 2017-11-03T08:27:18.18808-05:0
      DOI: 10.1002/asia.201701455
       
 
 
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