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  Subjects -> CHEMISTRY (Total: 845 journals)
    - ANALYTICAL CHEMISTRY (51 journals)
    - CHEMISTRY (595 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (67 journals)

CHEMISTRY (595 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 34)
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: 244)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 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: 56)
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: 17)
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)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 27)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 40)
Angewandte Chemie     Hybrid Journal   (Followers: 203)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 219)
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: 15)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 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: 310)
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: 118)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 91)
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: 4)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
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: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 14)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 72)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 24)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 20)
Chemical Reviews     Full-text available via subscription   (Followers: 182)
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: 58)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
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: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 258)
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: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
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: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 3)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
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: 17)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 61)
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  
Elements     Full-text available via subscription   (Followers: 3)
Environmental Chemistry     Hybrid Journal   (Followers: 7)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)

        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  [1579 journals]
  • Recent advancements of rylene imide dyes: synthesis and application as
           organic semiconducting materials
    • Authors: Jiajing Feng; Wei Jiang, Zhaohui Wang
      Abstract: Rylene imide dyes have been among the most promising organic semiconducting materials for several years due to their remarkable optoelectronic properties and high chemical/thermal persistency. In the past decades, various spendid rylene imide dyes have been developed for optoelectronic devices, such as organic solar cells (OSCs) and organic field-effect transistors (OFETs). Recently, tremendous progress of perylene diimides (PDIs) and the analogues used in OSCs has been witnessed attributed to their ease of functionalization. In this review, we will mainly focus on the synthetic strategies toward to latest PDI dyes and rylene imide analogues. A variety of molecules synthesized from different build blocks are summarized and some properties and applications are discussed as well.
      PubDate: 2017-11-16T03:55:57.615818-05:
      DOI: 10.1002/asia.201701424
       
  • Protic NNN and NCN Pincer-Type Ruthenium Complexes Featuring
           (Trifluoromethyl)pyrazole Arms: Synthesis and Application to Catalytic
           Hydrogen Evolution from Formic Acid
    • Authors: Yoshiko Nakahara; Tatsuro Toda, Asuka Matsunami, Yoshihito Kayaki, Shigeki Kuwata
      Abstract: The NNN and NCN pincer-type ruthenium(II) complexes featuring two protic pyrazol-3-yl arms with a trifluoromethyl (CF3) group at the 5-position were synthesized and structurally characterized to evaluate the impact of the substitution on the properties and catalysis. The Brønsted acidity increased by the highly electron-withdrawing CF3 pendants was demonstrated by the protonation-deprotonation experiments. By contrast, the infrared spectra of the carbonyl derivatives as well as the cyclic voltammogram indicated that the electron density of the ruthenium atom is little influenced by the CF3 group. Catalysis of these complexes in decomposition of formic acid to dihydrogen and carbon dioxide was also examined. The NNN pincer-type complex 1a with the CF3 group exhibited a higher catalytic activity than the tBu-substituted analogue 1b. In addition, the bis(CF3-pyrazolato) ammine derivative 4 catalyzed the reaction even in the absence of base additives.
      PubDate: 2017-11-15T10:58:49.677514-05:
      DOI: 10.1002/asia.201701474
       
  • Shape-Controlled Surface-Coating to Pd@Mesoporous Silica Core-Shell
           Nanocatalysts with High Catalytic Activity and Stability
    • Authors: Jie Ying; Christoph Janiak, Yu-Xuan Xiao, Hao Wei, Xiao-Yu Yang, Bao-Lian Su
      Abstract: Cubic Pd nanocrystals with shape-controlled mesoporous silica shells have been theoretically designed and successfully synthesized for investigating the effect of a porous nanoshell on catalytic performance of the core. Cubic Pd@cubic mesoporous silica keeps activity of all facets and shows highest catalytic activity and enhanced reusability in the hydrogenation of nitrobenzene.
      PubDate: 2017-11-14T22:20:32.777227-05:
      DOI: 10.1002/asia.201701452
       
  • Periodically Arranged Arrays of Dendritic Pt Nanospheres Using Cage-Type
           Mesoporous Silica as a Hard-Template
    • Authors: Kenya Kani; Victor Malgras, Bo Jiang, Md. Shahriar A. Hossain, Saad M. Alshehri, Tansir Ahamad, Rahul R. Salunkhe, Zhenguo Huang, Yusuke Yamauchi
      Abstract: Dendritic Pt nanospheres of 20 nm diameter are synthesized by using highly concentrated surfactant assembly within the large-sized cage-type mesopores of mesoporous silica (LP-FDU-12). After diluting the surfactant solution with ethanol, the lower viscosity lead to an improved penetration inside the mesopores. After Pt deposition followed by template removal, the arrangement of the Pt nanospheres is a replication from that of the mesopores in the original LP-FDU-12 template. Although it is well known that ordered LLCs can form on flat substrates, confined space inside the mesopores hinders surfactant self-organization. Therefore, the Pt nanospheres possess a dendritic porous structure over the entire area. The distortion observed in some nanospheres is attributed to the close proximity existing between neighboring cage-type mesopores. This new type of nanoporous metal with hierarchical architecture has the possibility to enhance substance diffusivity/accessibility for further improvement of catalytic activity.
      PubDate: 2017-11-14T21:56:03.648676-05:
      DOI: 10.1002/asia.201701393
       
  • Room-Temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with
           Tunable Localized Surface Plasmon Resonances
    • Authors: Chuanhui Zhu; Qun Xu, Liang Ji, Yumei Ren, Mingming Fang
      Abstract: In the cover picture, hydrogen sulfide (H2S) arising from the hydration of thioacetamide is represented by Sun Wukong, while the clouds stand for molybdenum oxide (MoO3-x) nanosheets. The produced H2S molecules allow generation of MoO3-x nanodots under ambient conditions. The as-prepared MoO3-x nanodots exhibit strong localized surface plasmon resonances (LSPR) in the visible and near-infrared region. Tunable plasmon resonances can be obtained in a wide range by selecting a suitable solvent, thus contributing to an enhanced photoelectrocatalytic activity. More information can be found in the Communication by Qun Xu et al.
      PubDate: 2017-11-13T06:31:34.999435-05:
      DOI: 10.1002/asia.201701456
       
  • Transition-Metal-Free Reaction of Aryltrimethylammonium Iodides with
           Arylzinc Reagents
    • Authors: Wei-Can Dai; Zhong-Xia Wang
      Abstract: The reaction of aryltrimethylammonium salts with arylzinc chlorides to form biaryls was previously performed using transition-metal catalysts. Now, the transformation can be achieved via transition-metal-free aromatic substitution under mild conditions. A wide substrate scope and good functional-group tolerance were observed. The reaction could be performed on a gram scale, thus showing the practicality of this transformation. More information can be found in the Communication by Wei-Can Dai and Zhong-Xia Wang.
      PubDate: 2017-11-13T06:31:21.933233-05:
      DOI: 10.1002/asia.201701464
       
  • Visible light photoactive highly efficient triplet sensitizers based on
           iodinated aza-BODIPYs: synthesis, photophysics and redox properties
    • Authors: Łukasz Łapok; Arkadiusz Gut, Dawid Drelinkiewicz, Tomasz Pędziński, Bronisław Marciniak, Maria Nowakowska
      Abstract: A series of novel iodinated NO2-substituted aza-BODIPYs have been synthesized and characterized. Highly desirable photophysical and photochemical properties were induced in NO2-substituted aza-BODIPYs by iodination of the pyrrole rings. In particular, high values of singlet oxygen quantum yields (ΦΔ) ranging from 0.79 to 0.85 were measured. The photooxygenation process proceeds via Type II mechanism under the experimental conditions applied. The compounds studied exhibited an absorption band within the so-called "therapeutic window", with λmax located between 645 nm to 672 nm. They were non-fluorescent at room temperature with excited singlet state lifetimes within the picosecond range as measured by femtosecond transient absorption. Nanosecond laser flash photolysis experiments revealed T1 Tn absorption spanning from ca. 400 nm to ca. 500 nm and allowed determination of the triplet state lifetimes. The estimated triplet lifetimes (τT) in deaerated acetonitrile ranged between 2.74 μs to 3.50 μs. As estimated by the CV/DPV measurements, all iodinated aza-BODIPYs studied exhibited one irreversible oxidation and two quasi-reversible reductions processes. Estimation of the EHOMO gave the value of - 6.06 to - 6.26 eV while the ELUMO was found to be located at ca. - 4.6 eV, respectively. Thermogravimetric (TGA) analysis revealed that iodinated aza-BODIPYs were stable up to approximately 300 °C. All compounds studied exhibit high photostability in toluene solution.
      PubDate: 2017-11-09T07:55:25.622932-05:
      DOI: 10.1002/asia.201701485
       
  • 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
       
  • Crystal and NMR Structures of a Peptidomimetic β-turn which provides
           facile synthesis of 13-membered Cyclic Tetrapeptides
    • Authors: Alan James Cameron; Christopher J Squire, Patrick J.B. Edwards, Elena Harjes, Vijayalekshmi Sarojini
      Abstract: Herein we report the unique conformations adopted by linear and cyclic tetrapeptides (CTPs) containing 2-aminobenzoic acid (2-Abz) in solution and as single crystals. The crystal structure of the linear tetrapeptide H2N-D-Leu-D-Phe-2-Abz-D-Ala-COOH (1) reveals a novel planar peptidomimetic β-turn stabilized by three hydrogen bonds and is in agreement with its NMR structure in solution. While CTPs are often synthetically inaccessible or cyclize in poor yield, both 1 and its N-Me-D-Phe analogue (2) adopt pseudo-cyclic frameworks enabling near quantitative conversion to the corresponding CTPs 3 and 4. The crystal structure of the N-methylated peptide (4) is the first reported for a 2-Abz containing CTP and reveals a distinctly planar 13-membered ring which is also evident in solution. The N-methylation of D-Phe results in a peptide bond inversion compared to the solution conformation of 3.
      PubDate: 2017-11-02T21:56:11.461241-05:
      DOI: 10.1002/asia.201701422
       
  • Synthesis of Naphthyridine Dimers with Conformational Restriction and
           Binding to DNA and RNA
    • Authors: Kazuhiko Nakatani; Nozomi Natsuhara, Yuki Mori, Sanjukta Mukherjee, Bimolendu Das, Asako Murata
      Abstract: One of the important determinants in the efficiency of a molecular interaction is the necessity for conformational changes in host and/or guest molecules upon binding. In small-molecule interactions with nucleic acids, conformational changes on both molecules are often involved, especially in intercalating binding. Mismatch binding ligands (MBLs) we described here consist of two heterocycles that predominantly exist in one conformation, so it is of interest to determine if such molecules can bind to any DNA and RNA structures. One molecule, 1-NHR, which predominantly exists as the unstacked conformation in aqueous solvent, has been successfully synthesized and characterized. Compound 1-NHR did not efficiently bind to GX/Y DNA and RNA sequences, but the binding pattern is different from that of authentic MBL naphthyridine carbamate dimer. In vitro selection of RNA that specifically binds to 1-NHR was performed from pre-miR-29a loop library RNA, and one RNA, to which 1-NHR bound with high affinity, has been successfully identified. Although it was anticipated that 1-NHR, with a predominantly unstacked conformation, would show entropy-driven binding, isothermal titration calorimetry analysis suggested that the binding of 1-NHR to RNA was enthalpy driven with an apparent Kd of about 100 nm.Get in there! Mismatch binding ligands (MBLs) composed of two heterocycles joined by short linkers to restrict conformational changes are investigated for their ability to bind to DNA and RNA, as revealed by conformation analysis and experimental results (see figure). The effects of solvent on stacked or unstacked conformations of MBLs are also revealed.
      PubDate: 2017-11-02T05:06:21.565325-05:
      DOI: 10.1002/asia.201701293
       
  • 3D Porous Carbon Frameworks Stabilized Ultra Uniform Nano γ-Fe2O3: An
           Exquisite Catalyst System
    • Authors: Qionglin Liang; Yongjian Ai, Mengqi He, Qianrui Lv, Lei Liu, Hongbin Sun, Mingyu Ding
      Abstract: We present a novel strategy for the scalable fabrication of γ-Fe2O3@3DPCF, a three dimensional porous carbon frameworks anchored ultra uniform and ultra stable nano γ-Fe2O3. The γ-Fe2O3@3DPCF nanocomposites were facilely prepared with the following route: a condensation of iron (III) acetylacetonate with acetoacetone at room temperature formed the polymer precursor (PPr), which was carbonized subsequently at 800 oC. The homogeneous aldol condensation offered an ultra uniform distribution of the iron, so that the γ-Fe2O3 nanoparticles (NPs) were uniformly distributed in the 3D carbon architecture with the average size of approximate 20 nm. The Fe2O3 NPs was capped with carbon, so that the iron oxide maintained its γ-phase instead of the more stable α-phase. The nanocomposite was an exquisite catalyst for the reduction of nitroarene, it gave>99% conversion and 100% selectivity for the reduction of nitroarenes to the corresponding anilines at 100 °C. The fabrication of the γ-Fe2O3@3DPCF nanocatalyst represents a green and scalable method for the synthesis of novel carbon-based metal oxides nanostructure.
      PubDate: 2017-11-01T03:20:32.247665-05:
      DOI: 10.1002/asia.201701457
       
  • Quantitative Analysis of Self-assembly Process of a Pd12L24 Coordination
           Sphere
    • Authors: Shumpei kai; Taro Shigeta, Tatsuo Kojima, Shuichi Hiraoka
      Abstract: The self-assembly process of a Pd12L24 sphere was revealed by a quantitative approach (quantitative analysis of self-assembly process: QASAP) quantifying all the substrates, the products, and the observable intermediates, indicating that the Pd12L24 sphere is produced through several pathways. Firstly, PdnL2n (n = 6, 8, and 9), which are perfectly closed structures smaller than the Pd12L24 sphere, and a mixture of intermediates not observed by NMR (Int) were produced. Next, the sphere was assembled from intra-/intermolecular reaction of a certain class of Int (path A) and from the coordination of free pyridyl groups in Int to the Pd(II) center of PdnL2n (n = 6, 8, and 9) (path B). While capping the free pyridyl groups in Int with Pd(II) ions perfectly inhibited the sphere formation, the addition of free L to Int accelerated the formation of the sphere.
      PubDate: 2017-10-31T04:50:36.963626-05:
      DOI: 10.1002/asia.201701351
       
  • Benziodoxole Triflate as a Versatile Reagent for Iodo(III)cyclization of
           Alkynes
    • Authors: Bin Wu; Junliang Wu, Naohiko Yoshikai
      Abstract: We report herein on the utility of benziodoxole triflate, derived from α,α-bis(trifluoromethyl)-2-iodobenzyl alcohol, as a versatile reagent for iodo(III)cyclization via electrophilic activation of alkyne. The reagent promotes cyclization of alkynes tethered to a variety of nucleophilic moieties, affording benziodoxole-appended (hetero)arenes such as benzofurans, benzothiophenes, isocoumarins, indoles, and polyaromatics under mild conditions. This unprecedented class of (hetero)aryl-IIII compounds proved easy to purify, stable, and amenable to various synthetic transformations.
      PubDate: 2017-10-30T22:50:39.06169-05:0
      DOI: 10.1002/asia.201701530
       
  • Click Chemistry Derived Pyridazines: Electron-Deficient Building Blocks
           with Defined Conformation and Packing Structure
    • Authors: Irén Birkenfelder; Johannes Gurke, Lutz Grubert, Stefan Hecht, Bernd M. Schmidt
      Abstract: A series of 3,6-bis(4-triazolyl)pyridazines equipped with terminal phenyl substituents with varying degree of fluorination were synthesized by the facile copper-catalyzed azide-alkyne cycloaddition and their structures were thoroughly investigated in the gas phase, in solution, and in the solid state by employing DFT calculations, NMR spectroscopy, and single-crystal X-ray diffraction, respectively. On the molecular level, their structure is governed by the strong preference of the triazole-pyridazine linkages for the anti-conformation. The molecules' supramolecular organization in the crystalline solid is controlled by -stacking, C-H··· as well as C F···H interactions. The latter can conveniently be tuned by the number and position of fluorine substituents in the terminal phenyl units, giving rise to either herringbone-like, 1D or 2D lamellar packing. Electrochemistry and optical spectroscopy of all compounds suggest that they might find use as electron-transporting / hole-blocking materials in organic electronics.
      PubDate: 2017-10-30T04:57:38.342281-05:
      DOI: 10.1002/asia.201701277
       
  • Controllable activation of Pd-G3 palladacycle precatalyst in the presence
           of thiosugars: rapid access to 1-aminobiphenyl thioglycoside atropoisomers
           at room temperature
    • Authors: Samir Messaoudi; Riyadh Ahmed Atto Al-Shuaeeb, Mouad Alami, Camille Dejean
      Abstract: A controllable method for the functionalization of XantPhos Pd-G3 precatalyst with thiosugars and thiols has been established. Under mild and operationally simple reaction conditions through just mixing of precatalyst and thiosugars (α- or β-mono-, di- and poly-thiosugar derivatives) in water at 25 °C for 20 min, a series of 1-aminobiphenyl thioglycosides that are difficult to synthesize by classical methods, has been synthesized in very high yields
      PubDate: 2017-10-26T03:05:58.036707-05:
      DOI: 10.1002/asia.201701415
       
  • One-step preparation of carbon-based solid acid catalyst from water
           hyacinth leaves for esterification of oleic acid and dehydration of xylose
           
    • Authors: Jutitorn Laohapornchaiphan; Christopher Smith, Siwaporn Meejoo Smith
      Abstract: Carbon-based solid acid catalysts were successfully obtained via one step hydrothermal carbonization (HTC) of water hyacinth (WH) in the presence of p-toluenesulfonic acid (PTSA). Increasing HTC temperatures from 180 to 240°C resulted in carbonaceous materials with increased sulfur content, and less adsorbed water. Material obtained at 220°C (WH-PTSA-220) contains the highest amount of acid sites, and promotes the highest initial rate of two transformations, methanolysis of oleic acid, and dehydration of xylose to furfural. While all PSTA treated WH catalysts gave comparable fatty acid conversions (97%) and furfural yields (60%) after prolonged reaction times, the WH-PTSA-240 system bearing a relatively low acid density maintains the most favorable reusability profile. Higher HTC temperatures (220-240°C) improved catalyst reusability profiles due to graphitization and hydrophobicity of the carbon surface. The catalyst systems derived herein from biomass may have potential applications in biorefining platforms, utilizing the conversion of waste biomass to chemicals.
      PubDate: 2017-10-25T04:07:04.504351-05:
      DOI: 10.1002/asia.201701369
       
  • Single Microbead-Anchored Fluorescent Immunoassay (SMFIA): A Facile and
           Versatile Platform Allowing Simultaneous Detection of Multiple Antigens
    • Authors: Desheng Chen; Xiaobo Zhang, Liping Zhu, Chenghui Liu, Zhengping Li
      Abstract: Fluorescent immunoassay on a single microbead: A concept of single microbead-anchored fluorescent immunoassay (SMFIA) has been developed for the facile and sensitive detection of various antigens. Owing to the highly concentrated fluorescence enrichment on a single microbead, the high sensitivity of the SMFIA can fully meet the clinical demand for disease diagnosis just by employing common sandwich immunoreactions without any further signal amplification routes. Furthermore, a fluorescence-encoding mechanism that allows simultaneous detection of multiple antigens in a single reaction is proposed. More information can be found in the Communication by Chenghui Liu, Zhengping Li et al.
      PubDate: 2017-10-25T02:55:46.032078-05:
      DOI: 10.1002/asia.201701396
       
  • Controlled Synthesis of Hollow PbS-TiO2 Hybrid Structures through an Ion
           Adsorption–Heating Process and their Photocatalytic Activity
    • Authors: Hongbo Xia; Suli Wu, Shufen Zhang
      Abstract: Hollow hybrid structures: Combining Ostwald ripening effect and Kirkendall effect is an attractive strategy to fabricate hollow structures. In this work, a synthetic strategy of hollow hybrid structures comprising two semiconductors has been developed. Monodisperse TiO2 spheres functionalized by sulfhydryl (SH) groups were used as substrates. Thus, metal ions can be adsorbed by -SH groups to form metal thiolates, and the C−S bonds can dissociate by heating to release S2−. Meanwhile, the amorphous TiO2 spheres were transformed into anatase phase during the reaction. As a result, a monodisperse hybrid hollow structure that exhibited enhanced photocatalytic activity could be obtained. More information can be found in the Full Paper by Suli Wu et al.
      PubDate: 2017-10-25T02:55:23.920248-05:
      DOI: 10.1002/asia.201701437
       
  • Chemical Fixation of CO2 and Other Heterogeneous Catalytic Studies
           Employing a Layered Cu-Porphyrin Prepared Through Single-Crystal to
           Single-Crystal Exchange of a Zn-analogue
    • Authors: Srinivasan Natarajan; Gargi Dutta, Ajay Kumar Jana
      Abstract: A solvothermal reaction of Zn(NO3)2.6H2O, tetra-(4-pyridyl)porphyrin (H2TPyP) and 4,4′-Oxybis(benzoic acid) (H2OBA) resulted in a new two-dimensional Zn-porphyrin MOF compound, [Zn2(C40H24N8)0.5(C14H8O5)(DMA)](DMA)(H2O)6, 1. The Zn(II) ions present in 1 could be ion-exchanged employing Cu(NO3)2.3H2O solution at room temperature resulting in [Cu2(C40H24N8)0.5(C14H8O5)(DMA)](DMA)(H2O)3, (Cu∊1) compound. The extra-framework solvent molecules have been shown to be reversibly removed/exchanged without the collapse of the framework. The solvent-free Cu∊1 was explored as an active heterogeneous catalyst towards three different organic reactions: (i) chemical fixation of CO2 into cyclic carbonate at room temperature under 1 atm; (ii) nitroaldol reaction under solvent free condition and (iii) three component coupling of aminopyridine, benzaldehyde and aryl alkynes followed by 5-exo-dig cyclization to produce an important pharmacophore imidazopyridine.
      PubDate: 2017-10-24T02:00:23.09326-05:0
      DOI: 10.1002/asia.201701384
       
  • The dual mechanism ICT-FRET-based fluorescent probe for the selective
           detection of hydrogen peroxide
    • Authors: Xiao Liang; Xiaoyi Xu, Dan Qiao, Zheng Yin, Luqing Shang
      Abstract: We designed and synthesized the dual mechanism ICT-FRET fluorescent probe for the selective detection of H2O2 in living cells. This probe used a coumarin-naphthalimide hybrid as the FRET platform and a boronate moiety as the recognition group. Upon addition of H2O2, the probe exhibited a redshifted (73 nm) fluorescence emission, and the ratio of fluorescence intensities at 558 and 485 nm (F558 / F485) shifted notably (up to 100-fold). Moreover, there was a good linearity (R2 = 0.9911) between the ratio and the concentration of H2O2 in the range of 0 to 60 µM, with a limit of detection of 0.28 µM (S/N = 3). This probe could also detect enzymatically generated H2O2. Importantly, it could visualize endogenous H2O2 produced by the stimulation of the epidermal growth factor (EGF).
      PubDate: 2017-10-23T21:30:41.248936-05:
      DOI: 10.1002/asia.201701382
       
  • Conversion of Triple Bonds to Single Bonds in a Domino Carbopalladation
           with Norbornene
    • Authors: Huanfeng Jiang; chuanle Zhu, Pengquan Chen, Rui Zhu, Guangbin Jiang, Zhiming Lin, Wanqing Wu
      Abstract: A domino carbopalladation reaction of haloalkynes is presented. Remarkably, the four-time carbopalladation process converts the carbon-carbon triple bonds of haloalkynes stepwise into carbon-carbon double bonds, and finally to carbon-carbon single bonds. This reaction features that the carbon-carbon double bonds of stable vinyl palladium intermediates are transformed to carbon-carbon single bonds with the generation of unstable alkyl palladium intermediates. The subsequently formed π-allylpalladium species are independently trapped by N-tosylhydrazones, boronic acids, and B2pin2 in a highly diastereoselective manner, delivering the corresponding polycyclic and twisted products with a bicyclo[3.2.1]oct-2-en-3-yl)tricyclo[3.2.1.02,4]octane core skeleton in moderate to good yields via C-C and C-B bond formations. Significantly, the dual roles of norbornenes, ring construction and ring expansion, and the identification of electron-rich tri(2-furyl)phosphine as the ligand are found to be critical for the success of these transformations.
      PubDate: 2017-10-23T10:00:40.132073-05:
      DOI: 10.1002/asia.201701241
       
  • IrIII-based Octahedral Metalloligands Derived Primitive Cubic Frameworks
           for Enhanced CO2/N2 Separation
    • Authors: Sheng-Li Huang; Naifang Liu, Yun Ling, He-Kuan Luo
      Abstract: We developed a metalloligand strategy to construct porous frameworks, viz. the combined use of IrIII-based octahedral metalloligands and linear unit [Ni(cyclam)] easily afforded two isostructural complexes 1 and 2 with primitive cubic frameworks. Both two complexes show good CO2/N2 separation property.
      PubDate: 2017-10-22T20:50:51.027216-05:
      DOI: 10.1002/asia.201701339
       
  • Recyclable and Intrinsically Anti-cyanobacterial Polyanionic Membranes
    • Authors: Zhe Sun; Xin Liu, Jiangna Guo, Dan Xu, Songdong Shen, Feng Yan
      Abstract: Cyanobacteria blooms possess serious threats to water resources. Herein, we report the synthesis of polyanionic membranes (PA-M) by in situ photo-crosslinking of a sulfate-based anionic monomer followed by cation-exchange with metal cations, Fe3+ (PA-Fe), Cu2+ (PA-Cu), or Zn2+ (PA-Zn). The effect of cations on the anti-cyanobacterial activities against both Microcystis aeruginosa (M. aeruginosa) and Anabaena flos-aquae (A. flos-aquae) was investigated. All the prepared metal-containing membranes (PA-Fe, PA-Cu, PA-Zn) exhibit high anti-cyanobacterial activities and long-term anti-cyanobacterial stability, demonstrating that the synthesized PA-M membranes can be used as an effective and safe inhibitor to control cyanobacterial blooms.Don't be so anti anything: Polyanionic membranes with high anti-cyanobacterial activities and exhibit long-term anti-cyanobacterial stability against both M. aeruginosa and A. flos-aquae were synthesized and investigated.
      PubDate: 2017-10-20T02:05:26.139378-05:
      DOI: 10.1002/asia.201701219
       
  • Chemical Stimulus-responsive Folding and Unfolding of a Dendrimeric
           Assembly
    • Authors: Masatoshi Kozaki; Ryo Kimura, Shuichi Suzuki, Keiji Okada
      Abstract: A dendrimeric trimer undergoes folding and unfolding in response to chemical stimulus. The trimer of interest contains a central dendrimer with a butadiyne-linked zinc porphyrin dimer ((ZnP)₂) core, in addition to two terminal dendrimers with zinc porphyrin (ZnP) cores. The obtained absorption spectra indicate that the unfolded form is the exclusive conformer in chloroform, while the addition of 1,4-diazabicyclo[2.2.2]octane (DABCO) in chloroform leads to transformation from the unfolded to the folded structure containing two DABCO units per trimer; the folded structure originates from the cross-linking of (ZnP)₂ and ZnP with DABCO. Moreover, the addition of excess DABCO promotes the generation of the unfolded structure containing four DABCO units.
      PubDate: 2017-10-19T06:45:55.241816-05:
      DOI: 10.1002/asia.201701487
       
  • Programmed Site-Selective Palladium-Catalyzed Arylation of
           Thieno[3,2-b]thiophene
    • Authors: T. M. Ha Vuong; Didier Villemin, Hung-Huy Nguyen, Tin Thanh Le, Tung T. Dang, Hien Nguyen
      Abstract: An efficient and straightforward method for the synthesis of multi-arylated thieno[3,2-b]thiophene is reported. The direct site-selective arylation of 2-arylthieno[3,2-b]thiophene takes place at predictable positions (i.e., at the C-3 or C-5 position) depending on the nature and the size of the 2-aryl substituents. If the 2-aryl substituent bears an electron-withdrawing group, the next arylation takes place at the C-3 position. On the other hand, if the 2-aryl substituent bears an electron-donating group, the next arylation takes place at the C-5 position. More information can be found in the Full Paper by Tung Thanh Dang, Hien Nguyen et al.
      PubDate: 2017-10-19T06:30:26.968761-05:
      DOI: 10.1002/asia.201700855
       
  • Horseradish peroxidase-catalyzed hydrogelation for biomedical,
           biopharmaceutical, and biofabrication applications
    • Authors: Shinji Sakai; Masaki Nakahata
      Abstract: Horseradish peroxidase (HRP)-catalyzed hydrogelation has attracted much attention due to the ease of handling, high biocompatibility, and processability. This review summarizes recent developments including cutting-edge research using HRP-mediated hydrogelation toward biomedical, biopharmaceutical, and biofabrication applications. From the viewpoint of polymer chemistry, the basic chemistry behind hydrogelation, the structure-property relationship, and hybridization of multiple materials using HRP-catalyzed hydrogelation are summarized. From the chemical engineering perspective, strategies for controlling hydrogelation kinetics, hydrogel characteristics, and hydrogelation processes are summarized and discussed in detail. Strategies for obtaining biomaterials for medical and pharmaceutical use, and biofabrication for tissue engineering and regenerative medicine emerge by unifying the aspects of HRP-mediated hydrogelation.
      PubDate: 2017-10-18T10:18:49.483475-05:
      DOI: 10.1002/asia.201701364
       
  • Step-up synthesis of periodic mesoporous organosilicas with the framework
           of tyrosine (Tyr-PMOs) and performance on horseradish peroxidase
           immobilization
    • Authors: Jianqiang Wang; Wenqi Zhang, Changqing Gu, Wenpei Zhang, Man Zhou, Zhiwei Wang, Cheng Guo, Linbing Sun
      Abstract: A new amino-acid bridged periodic mesoporous organosilicas (PMOs) have been constructed via hydrolysis and condensation reactions under acid condition in the presence of template. The tyrosine bissilylated organic precursor (TBOS) was first prepared through multi-step reaction using tyrosine (natural amino acid) as starting material. The PMOs with the framework of tyrosine (Tyr-PMOs) were architected by simultaneously using TBOS and TEOS as complex silicon source in the condensation process. All the Tyr-PMOs materials were characterized by XRD, FT-IR, N2 adsorption-desorption, TEM, SEM and 29Si solid-state NMR to confirm the structure. The enzyme of horseradish peroxidase (HRP) is first immobilized on these new Tyr-PMOs materials. The optimal conditions of enzyme adsorption are as the followings: temperature of 40◦C, time of 8 h, pH of 7. Furthermore, the novel Tyr-PMOs materials could store HRP for about 40 days to keep the enzymatic activity and the Tyr-PMOs-10%-HRP with best immobilization effect could be reused for 8 times at least.
      PubDate: 2017-10-18T00:46:42.262982-05:
      DOI: 10.1002/asia.201701285
       
  • A Novel trans-1-(9-anthryl)-2-phenylethene Derivatives Containing
           Phenanthroimidazoles Unit for Organic Light-emitting Diodes Application
    • Authors: Nonglin Zhou; Shirong Wang, Yin Xiao, Xianggao Li
      Abstract: Aryl-substituted phenanthroimidazoles (PIs) have attracted tremendous attention in the field of organic light-emitting diodes (OLEDs) because they possess simple synthesis, excellent thermal properties, high photoluminescence quantum yields (PLQYs), and bipolar properties. Herein, a novel blue-green emitting material, (E)-2-(4'-(2-(anthracen-9-yl)vinyl)-[1,1'-biphenyl]-4-yl)-1-phenyl-1H-phenanthro[9,10-d]imidazole (APE-PPI), which contains t-APE (1-(9-anthryl)-2-phenylethene) core and PIs moiety, has been designed and synthesized. Owing to the favored PIs skeleton, the APE-PPI possesses high thermal stability and high PLQYs. And the compound exhibits bipolar transporting characteristics which identified by the single-carrier devices. The non-doped blue-green OLEDs using APE-PPI as emitting layer shows emission at 508 nm, full width at half maximum of 82 nm, maximum brightness of 9042 cd m-2, maximum current efficiency of 2.14 cd A-1, and Commission Internationale de L'Eclairage (CIE) coordinate of (0.26, 0.55), respectively. Furthermore, the white OLEDs (WOLEDs) is fabricated by employing APE-PPI as blue-green emitting layer and 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB) doped in tris-(8-hydroxyquinolinato)aluminum (Alq3) as the red-green emitting layer. And the WOLEDs exhibits a maximum brightness of 10029 cd m-2, maximum current efficiency of 16.05 cd A-1, and CIE coordinate of (0.47, 0.47), Color Rendering Index (CRI) of 85, respectively. The high performance of APE-PPI based devices provides the promising potential of t-APE and PIs combination to synthesize efficient electroluminescent material for WOLEDs.
      PubDate: 2017-10-17T11:40:28.792308-05:
      DOI: 10.1002/asia.201701371
       
  • Conjugated Microporous Polymers for Heterogeneous Catalysis
    • Authors: Yun-Bing Zhou; Zhuang-Ping Zhan
      Abstract: Conjugated microporous polymers (CMPs) are a class of crosslinked polymers that combine permanent micropores with π-conjugated skeletons and possess three-dimensional (3D) networks. Compared with conventional materials such as metal-organicframeworks (MOFs) and covalent organic frameworks (COFs), the CMPs usually have superior chemical and thermal stability. CMPshave made significant progress in heterogeneous catalysis in the past seven years. With a bottom-up strategy, catalytic moieties canbe directly introduced into in the framework to produce heterogeneous CMP catalysts. Higher activity, stability, and selectivity can beobtained with heterogeneous CMP catalysts in comparision with their homogeneous analogs. In addition, CMP catalysts can be easilyisolated and recycled. In this review, we focus on CMPs as an intriguing platform for developing various highly efficient and recyclableheterogeneous catalysts in organic reactions. The design, synthesis and structure of these CMP catalysts are also discussed in thisfocus review.
      PubDate: 2017-10-17T07:40:58.895401-05:
      DOI: 10.1002/asia.201701107
       
  • Coaxial Carbon/MnO2 Hollow Nanofibers as Sulfur Hosts for High-Performance
           Lithium-Sulfur Batteries
    • Authors: Lubin Ni; Ganjin Zhao, Yanting Wang, zhen Wu, Wei Wang, Yunyun Liao, Guang Yang, Guowang Diao
      Abstract: Lithium-sulfur (Li-S) batteries have recently attracted a large amount of attention as promising candidates for next-generation high-power energy storage devices because of their high theoretical capacity and energy density. However, the shuttle effect of polysulfides and poor conductivity of sulfur are still vital issues that constrain their specific capacity and cyclic stability. Here, we design coaxial MnO2-graphitic carbon hollow nanofibers as sulfur hosts for high-performance lithium-sulfur batteries. The hollow C/MnO2 coaxial nanofibers are synthesized via electrospinning and carbonization of the carbon nanofibers (CNFs), followed by an in situ redox reaction to grow MnO2 nanosheets on the surface of CNFs. The inner graphitic carbon layer not only maintains intimate contact with sulfur and outer MnO2 shell to significantly increase the overall electrical conductivity but also acts as a protective layer to prevent dissolution of polysulfides. The outer MnO2 nanosheets restrain the shuttle effect greatly through chemisorption and redox reaction. Therefore, the robust S@C/MnO2 nanofiber cathode delivers extraordinary rate capability, and excellent cycling stability with capacity decay rate of 0.044 and 0.051 % per cycle after 1000 cycles at 1.0 C and 2.0 C, respectively. Our present work brings forward a new facile and efficient strategy for the functionalization of inorganic metal oxide on graphitic carbons as sulfur hosts for high performance Li-S batteries.
      PubDate: 2017-10-17T04:47:30.212471-05:
      DOI: 10.1002/asia.201701343
       
  • Knitting N-doped Hierarchical Porous Polymers to Stabilize Ultra-small Pd
           Nanoparticles for Solvent Free Catalysis
    • Authors: Yan Sun; Tao Wang, Ang Li, Ling Zhang, Qisheng Huo, Zhen-An Qiao
      Abstract: Hierarchical porous polymers with more than one pore size distributions can effectively support noble metal catalysts and circumvent the limitation of the diffusion of the reactants, and thus exhibit both excellent catalytic activity and superior diffusive properties. Herein, we report a simple one-step Friedel-Crafts reaction to knit a series of benzene heterocycle monomers, such as indane, indoline, indole and tetrahydronaphthalene to obtain hierarchical porous polymers with high surface areas and/or abundant N sites. These polymers can be directly used to immobilize Pd ions, and stabilize Pd nanoparticles during the thermal reduction process to obtain Pd/Polymer catalysts. In particular, indoline and indole based polymers with high N content up to 7 wt% exhibit outstanding ability to stabilize uniform ultrasmall Pd nanoparticles. The obtained Pd-Polymers exhibit excellent catalytic activity in solvent-free oxidation of benzyl alcohol with O2.
      PubDate: 2017-10-16T07:50:32.053377-05:
      DOI: 10.1002/asia.201701104
       
  • Rhodium(III)-Catalyzed Directed C−H Amidation of N-Nitrosoanilines and
           Subsequent Formation of 1,2-Disubstituted Benzimidazoles
    • Authors: Yanyu Chen; Rong Zhang, Qiujun Peng, Lanting Xu, XianHua Pan
      Abstract: An efficient rhodium-catalyzed direct C−H amidation of N-nitrosoanilines with 1,4,2-dioxazol-5-ones as amidating agents has been developed. This method featured mild reaction conditions, a wide substrate scope and satisfactory yields. Besides, the amidated products could be readily converted to pharmaceutically valuable 1,2-disubstituted benzimidazoles via an HCl-mediated deprotection/cyclization process in one pot.Can't say NO to that! An efficient rhodium-catalyzed direct C−H amidation of N-nitrosoanilines with 1,4,2-dioxazol-5-ones as amidating agents and subsequent formation of 1,2-disubstituted benzimidazoles via a one-pot reaction has been developed.
      PubDate: 2017-10-12T08:16:19.374233-05:
      DOI: 10.1002/asia.201701287
       
  • Impact of Linear Alkyl Length on Assembly of Twisted Perylene Bisimides:
           From Molecular Arrangement to Nanostructures
    • Authors: Zongxia Guo; Kun Wang, Ping Yu, Xiangnan Wang, Shusha Lan, Kai Sun, Yuanping Yi, Zhibo Li
      Abstract: The linear alkyl chain length effect on the assembly of non-planar perylene bisimides (PBIs, 1 with -C6H13; 2 with -C12H25) has been investigated. It was suggested that π–π stacking predominated in assemblies of 1 with short alkyl chains, while both π–π stacking and van der Waals interactions contributed to the hierarchical assembly of 2 with longer alkyl chains. Thus, by changing the linear chain length, the hierarchical assembly of PBIs modified on bay positions could be manipulated effectively. More information can be found in the Full Paper by Zongxia Guo, Zhibo Li et al.
      PubDate: 2017-10-12T07:16:58.652064-05:
      DOI: 10.1002/asia.201701226
       
  • Photoelectrochemical Complexes of Fucoxanthin-Chlorophyll Protein for
           Bio-Photovoltaic Conversion with a High Open-Circuit Photovoltage
    • Authors: Xin Chen; Cheng Liu, Wenjing Dong, Wenda Wang, Yan Sun, Xin Chen, Chunhong Yang, Ning Dai
      Abstract: Open-circuit photovoltage (Voc) is among critical parameters for achieving an efficient light-to-charge conversion in existing solar photovoltaic devices. Natural photosynthesis exploits light-harvesting chlorophyll (Chl) protein complexes to transfer sunlight energy efficiently. We describe the exploitation of photosynthetic fucoxanthin-chlorophyll protein (FCP) complexes for realizing photoelectrochemical cells with a high Voc. An antenna-dependent photocurrent response and a Voc up to 0.72V are observed and demonstrated in the bio-photovoltaic devices fabricated with photosynthetic FCP complexes and TiO2 nanostructures. Such high Voc is determined by fucoxanthin in FCP complexes, and is rarely found in photoelectrochemical cells with other natural light-harvesting antenna. We think that the FCP-based bio-photovoltaic conversion will provide an opportunity to fabricate the environmental benign photoelectrochemical cells with high Voc, and also help improve the understanding of the essential physics behind the light-to-charge conversion in the photosynthetic complexes.
      PubDate: 2017-10-11T01:55:41.443949-05:
      DOI: 10.1002/asia.201701296
       
  • Guianolactones A and B, Two Rearranged Pentacyclic Limonoids from the
           Seeds of Carapa guianensis.
    • Authors: Keiichiro Higuchi; Yoshimi Tani, Takashi Kiuchi, Yasuko In, Takeshi Yamada, Osamu Muraoka, Naonobu Tanaka, Reiko Tanaka
      Abstract: Two novel rearranged limonoids, guianolactones A (1) and B (2), were isolated from Carapa guianensis Aubl. (Meliaceae) seeds. The structures of 1 and 2 with the absolute configurations were determined by detailed examination of single crystal X-ray diffraction analyses and 2D NMRspectra. Guianolactone A (1) has a novel 5/6/6/6/6 pentacyclic core including two -lactone and a tetrahydropyran rings, while guianolactone B (2) is a novel limonoid with a 6/6/5/6/6 pentacyclic core featuring a -lactone and a tetrahydrofuran rings.
      PubDate: 2017-10-10T03:50:25.764277-05:
      DOI: 10.1002/asia.201701298
       
  • Preparation and Thermal Properties of Polycarbonates/esters Catalyzed by
           Dinuclear Salph-Al from ROP of Epoxide Monomers
    • Authors: Yanchuan Zhou; Ranlong Duan, Xiang Li, Xuan Pang, Xianhong Wang, Xuesi Chen
      Abstract: A dinuclear Salph-Al complex/bis(triphenylphosphine)iminium chloride catalyst system was synthesized and employed for cyclohexene oxide (CHO) and CO2 copolymerization. The catalyst system had excellent selectivity of 99% for the carbonate linkages. And resultant poly(cyclohexene carbonate) (PCHC) had a high glass transition temperature (Tg) of 123.8 °C and a thermal decomposition temperature (5% weight loss) (Td,5%) of 265 °C. Furthermore, this catalyst system was reactive for the copolymerization of phthalic anhydride (PA) and epoxide. Poly(CHO-alt-PA) was completely alternate, which had improved thermal properties (Tg= 142.7 and Td,5%=295 °C) compared with PCHC. Tg values of the polyesters could be adjusted upon the addition of PO to the CHO/PA reaction system. For the CHO/PO/PA terpolymerization, CHO and PO were concurrently participated in the chain growth proportionally and the obtained terpolyesters had tunable Tg from 62.8 to 142.7 °C by the adjustment of CHO/PO feed ratio.
      PubDate: 2017-10-09T04:46:38.023918-05:
      DOI: 10.1002/asia.201701048
       
  • Green and Efficient Processing of Cinnamomum Cassia bark using Ionic
           Liquids: Extraction of Essential Oil and Construction of UV-Resistant
           Composite Films from Residual Biomass
    • Authors: Mohit Mehta; Arvind Kumar
      Abstract: There is a significant interest in development of sustainable and integrated process of extraction of essential oils and separation of biopolymers using novel and efficient solvent systems. Herein, Cassia essential oil enriched in Coumarin is extracted from Cinnamomum Cassia bark using a protic ionic liquid, ethylammonium nitrate (EAN) via dissolution and creation of a biphasic system with the help of diethyl ether. The process has been perfected in terms of higher biomass dissolution ability and essential oil yield by addition of aprotic ILs (based on 1-butyl-3-methyl imidazolium cation [Bmim] and chloride [Cl] or acetate [OAc] anion) to EAN. After extraction of oil, cellulose-rich material and free lignin were regenerated from biomass-ionic liquid solutions by using 1:1 acetone-water mixture. Purity of extracted essential oil and biopolymers were ascertained using FT-IR, NMR, and GC-MS techniques. Since, the lignin contains UV blocking chromophores, the oil free residual lignocellulosic material has been directly utilized to construct UV light resistant composite materials in conjunction with biopolymer chitosan. Composite material thus obtained was processed to make bio-degradable films which were characterized for mechanical and optical properties. The films showed excellent UV light resistance and mechanical properties thereby making it a material suitable for packaging and light-sensitive applications.
      PubDate: 2017-10-08T20:50:45.928723-05:
      DOI: 10.1002/asia.201701155
       
  • Li2MnSnSe4:A New Quaternary Diamond-Like Semiconductor with Nonlinear
           Optical Response and Antiferromagnetic Property
    • Authors: Xiaoshuang Li; Chao Li, Molin Zhou, Yicheng Wu, Jiyong Yao
      Abstract: A new selenide with diamond-like structure, Li2MnSnSe4, was synthesized for the first time by a conventional high-temperature solid-state reaction method. Li2MnSnSe4 crystallizes in the space group Pmn21 (No. 31) of the orthorhombic system. Its three-dimensional framework was constructed by corner sharing LiSe4, MnSe4 and SnSe4 tetrahedra. The title compound has been discovered to be both type-I phase-matchable and exhibit moderate powder second harmonic generation intensity, about 0.5 times that of commercial AgGaS2 in the particle size of 200−250 μm at a laser radiation of 2.09 μm. Besides, Li2MnSnSe4 exhibits congruent-melting behavior, which makes the bulk single crystal growth by the Bridgman-Stockbarger method possible. The temperature dependent susceptibility measurement indicates an antiferromagnetic interaction with the Néel temperature TN = 8.6 K for this compound.
      PubDate: 2017-10-07T07:19:37.587063-05:
      DOI: 10.1002/asia.201701313
       
  • A Novel Spiro[acridine-9,9'-fluoren] Derivatives Containing
           Phenanthroimidazole Moiety for Deep-Blue OLED Application
    • Authors: Wei Sun; Nonglin Zhou, Yin Xiao, Shirong Wang, Xianggao Li
      Abstract: Typical π-π stacking and the aggregation caused quenching could be suppressed in the film-state by the spiro conformation molecular design in the filed of organic light-emitting diodes (OLEDs). Herein, a novel deep-blue fluorescent material with spiro conformation, 1-(4-(tert-butyl)phenyl)-2-(4-(10-phenyl-10H-spiro[acridine-9,9'-fluoren]-2-yl)phenyl)-1H-phena-nthro[9,10-d]imidazole (SAF-BPI), was designed and synthesized. The compound consists of spiro-acridine-fluorene (SAF) as donor part and phenanthroimidazole (BPI) as acceptor part. Owing to the rigid SAF skeleton, this compound exhibits high thermal stability with transition temperature (Tg) of 198 ℃. The compound exhibits bipolar transporting characteristics demonstrated by the single-carrier devices. The non-doped OLEDs based on the SAF-BPI as the emitting layer shows maximum emission at 448 nm, maximum luminance of 2122 cd m-2, maximum current efficiency (CE) of 3.97 cd A-1, maximum power efficiency of 2.08 lm W-1. The chromaticity coordinate is stable at (0.15, 0.10) at the voltage of 7-11 V. The device shows a slow efficiency roll-off with CE 3.35, 2.85 cd A-1 at 100, 1000 cd m-2, respectively.
      PubDate: 2017-10-06T05:12:40.27541-05:0
      DOI: 10.1002/asia.201701292
       
  • Cyclization Reactions of Aryl Propargyl Acetates with Tethered Epoxide
           Induced by Ruthenium Complex
    • Authors: Yi-Jhen Feng; Yi-Hsin Chen, Shou-Ling Huang, Yi-Hung Liu, Ying Chih Lin
      Abstract: Reactions of the ruthenium complex [Ru]Cl ([Ru] = Cp(PPh3)2Ru; Cp = η5-C5H5) with several aryl propargyl acetates, each with ortho-substituted chain of various length containing epoxide on the aromatic ring and with or without methyl substitutents on the epoxide ring, bring about novel cyclizations. The cyclization reactions of HC≡CCH(OAc)(C6H4)CH2(RC2H2O) (R = H, 6a; R = CH3, 6b, where RC2H2O is an epoxide ring) in MeOH give the vinylidene complexes 5a-b, respectively, each with a tetrahydro-5H-benzo[7]annulen-6-ol ring bonded at Cβ of the vinylidene ligand. A C-C bond formation takes place between the propargyl acetate and the less substituted carbon of the epoxide ring. Further cyclizations of 5a-b induced by HBF4 give the corresponding vinylidene complexes 8a-b each with a new 8-oxabicyclo-[3.2.1]octane ring by removal of a methanol molecule in high yield. For similar aryl propargyl acetates 11a-c, each with a shorter epoxide chain, the cyclization gives mixture of the vinylidene complex 13 with a tetrahydronaphthalen-1-ol ring and the carbene complex 14 with a tricyclic indeno-furan ring. In the direct reaction of [Ru]Cl with aryl propargyl acetates 18, tethering a longer epoxide chain, no cyclization involving C-C or C-O bond formation is observed. However, if opening of the epoxide ring of 18 is first carried out to afford the vicinal bromohydrin 22, then tandem cyclization of 22 induced by [Ru]Cl in MeOH generates the vinylidene complex 23 with 9-oxabicyclo[4.2.1]nonane ring in one pot. All of these reaction products are characterized by spectroscopic methods. In addition, the structures of six complexes 4, 5b, 8a, 8b, 14a and 15b have been confirmed by X-ray diffraction analysis.
      PubDate: 2017-10-05T05:05:45.370312-05:
      DOI: 10.1002/asia.201701070
       
  • The Quest of Excited-State Intramolecular Proton Transfer via
           Eight-Membered Ring π-Conjugated Hydrogen Bonding System
    • Authors: Fan-Yi Meng; Yen-Hao Hsu, Zhiyun Zhang, Pei-Jhen Wu, Yi-Ting Chen, Yi-An Chen, Chi-Lin Chen, Chi-Min Chau, Kuan-Miao Liu, Pi-Tai Chou
      Abstract: Searching for eight-membered ring π-conjugated hydrogen bonding (8-MR H-bonding) systems with excited-state intramolecular proton transfer (ESIPT) property is seminal and synthetically challenging. In this work, a series of π-conjugated molecules (8-HB-1, 8-HB-L1 and 8-HB-2) potentially possessing 8-MR H-bond are strategically designed, synthesized and characterized. The configurations of these three potential molecules are checked by their X-ray structures, among which 8-HB-L1 (a structurally locked 8-HB-1 core chromophore) is proved to be an 8-MR H-bonding system, whereas 8-HB-1 and 8-HB-2 are too sterically hindered to form the 8-MR intramolecular H-bond. The ESIPT property of 8-HB-L1 is confirmed by the dual fluorescence consisting of normal and proton-transfer tautomer emissions. The insight into the ESIPT process of 8-HB-L1 is provided by femtosecond fluorescence upconversion measurements together with computational simulation. The results demonstrate for the first time a successful synthetic route to attain an 8-MR H-bonding molecule 8-HB-L1 with ESIPT property.
      PubDate: 2017-10-05T03:00:32.363679-05:
      DOI: 10.1002/asia.201701057
       
  • Polymorph-dependent green, yellow and red emissions of organic crystals
           for laser application
    • Authors: Hongbing Fu; Zhenzhen Xu, Zhiwei Zhang, Xue Jin, Qing Liao
      Abstract: Color tuning of organic solid-state luminescent materials remain difficult and time-consuming through conventional chemical synthesis. Herein we reported highly efficient polymorph-dependent green (P1), yellow (P2), and red (P3) emissions of organic crystals made by the same molecular building blocks of 4-(2-{4-[2-(4-Diphenylamino-phenyl)-vinyl]-phenyl}-vinyl)-benzonitrile (DOPVB). Single-crystal and spectroscopy data reveal that all three polymorphs follow the herringbone packing motif in H-type aggregations. On the one hand, from P1, P2 to P3, the reduced pitch translation along Π-stacks increases the intermolecular interactions between adjacent molecules, therefore leading to gradually red-shifted emissions from 540, 570 to 614 nm. On the other hand, the edge-to-face arrangement and large roll translations avoid strong Π-Π overlap, making P1, P2 and P3 highly emissive with record-high solid-state fluorescence quantum yields of 0.60, 0.98, and 0.68, respectively. Furthermore, the optically allowed 0-1 transitions of herringbone H-aggregates of P1, P2 and P3 naturally provide a four-level scheme, enabling green and yellow amplified spontaneous emissions (ASE) with very low thresholds.
      PubDate: 2017-10-04T23:00:40.331412-05:
      DOI: 10.1002/asia.201701207
       
  • Synthesis of MOF-525 Derived Nanoporous Carbons with Different Particle
           Sizes for Supercapacitor Application
    • Authors: Ting-Hsiang Chang; Christine Young, Min-Han Lee, Rahul R. Salunkhe, Saad M. Alshehri, Tansir Ahamad, Md. Tofazzal Islam, Kevin C.-W. Wu, Md. Shahriar A. Hossain, Yusuke Yamauchi, Kuo-Chuan Ho
      Abstract: Nanoporous carbon (NC) materials have attracted great research interest for supercapacitor applications, because of their excellent electrochemical and mechanical stability, good electrical conductivity, and high surface area. Although there are many reports on metal–organic framework (MOF)-derived carbon materials, previous synthetic studies have been hindered by imperfect control of particle sizes and shapes. Here, we show precise control of the particle sizes of MOF-525 from 100 nm to 750 nm. After conversion of MOF-525 to NC, the effects of variation of the particle size on the electrochemical performance have been carefully investigated. The results demonstrate that our NC is a potential candidate for practical supercapacitor applications.A good candidate: A precise control of the particle sizes of MOF-525 from 100 nm to 750 nm is reported. After conversion of MOF-525 to nanoporous carbon (NC), the effects of variation of the particle size on the electrochemical performance have been carefully investigated. The results demonstrate that the obtained NC is a potential candidate for practical supercapacitor applications.
      PubDate: 2017-10-04T12:06:54.991098-05:
      DOI: 10.1002/asia.201701082
       
  • An Atomically Precise Alkynyl-protected PtAg₄₂ Superatom Nanocluster
           and Its Structural Implications
    • Authors: Hui Shen; Tsutomu Mizuta
      Abstract: We report the synthesis and structure determination of the first alkynyl-protected Pt-doped Ag superatom nanocluster, [PtAg₄₂(C≡CC₆H₄CH₃)₂₈](SbF₆)₆ (1). The metallic core of this cluster can be viewed as a concentric three-shell Matryoshka doll comprising Pt@Ag₁₂@Ag₃₀, in which the missing icosidodecahedral Ag₃₀ shell and a new structural unit, M₄₃, have been observed. On the surface of 1, 28 alkynyl groups and 4 SbF₆- anions were found co-protecting it. The protective role of SbF₆- in nanoclusters is unprecedented. Moreover, of the 28 alkynyl ligands, 12 are connected not only with the outermost Ag₃₀ shell but also the inner Ag₁₂ shell through the twelve pentagonal faces of the outermost icosidodecahedral Ag₃₀ shell. Overall, by determining the crystal structure of 1, we discovered the missing icosidodecahedral Ag₃₀ shell and the protective effect of SbF₆- anions and demonstrated a novel M₄₃ structural unit and the unique penetrability of pentagonal faces.
      PubDate: 2017-10-02T21:25:30.154666-05:
      DOI: 10.1002/asia.201701337
       
  • Synthesis of C3 Methyl Substituted Pyrroloindolines and Furoindolines via
           Cascade Dearomatization of Indole Derivatives with Methyl Iodide
    • Authors: Shuli You; Ji-Cheng Yi, Chuan Liu, Li-Xin Dai
      Abstract: A highly efficient method for constructing C3 methyl substituted pyrroloindolines and furoindolines via cascade dearomatization reaction of indole derivatives with methyl iodide was developed. This protocol offers a direct approach to a wide range of C3 methyl substituted pyrroloindolines under mild conditions. The utility of this method was further demonstrated in the concise synthesis of (±)-esermethol.
      PubDate: 2017-10-02T03:15:23.631128-05:
      DOI: 10.1002/asia.201701151
       
  • Synthesis, Characterization and Catalytic Application of Pyridine-bridged
           
    • Authors: Tao Tu; Jiangbo Chen, Haibo Zhu, Jinjin Chen, Zhang-Gao Le
      Abstract: A series of novel bulky pyridine-bridged NHC-Ru complexes have been rational designed and synthesized, which exhibited extremely high catalytic activity in the hydrogenation of cyclic and linear carbonates under mild reaction conditions. In the presence of catalytic amount of weak base, a broad range of substrates with different ring size and steric bulkness were well tolerated providing methanol and corresponding diols in excellent yields with the catalyst loading as low as 0.5 mol %.
      PubDate: 2017-10-02T02:20:55.240181-05:
      DOI: 10.1002/asia.201701303
       
  • Synthesis and Characterization of Polycyclic Aromatic Hydrocarbons with
           Different Space-Constructions Based on the Hexaphenylbenzene Derivatives
    • Authors: Weizhi Wang; Hua Chen, Hao Yun Zhu, Yu Li Huang, Jun Wei Yang
      Abstract: In recent years, low-bandgap polymers have attracted a wide range of attention in many fields. These compounds syntheses were focused on three factors according to the Roncali bandgap theory: 1) the degree of bond length alternation Eδr, 2) the aromatic resonance energy of the cycle ERes, and 3) the substituted groups ESub. Now, we designed and prepared the low-bandgap polymers in a different way by the factor Eθ, the polymer chain deviation from planarity, and EInt, the interaction of the molecular chains in the solid state. So, three polycyclic aromatic hydrocarbons with different space-constructions based on the hexaphenylbenzene derivatives were prepared in this work: linear type (P1-OX), V type (P2-OX) and zigzag type (P3-OX). These well-defined polymers exhibited the interesting behaviors in optics, electrochemistry due to their different extent of planarity. Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) gave the incremental orderly molecular weight distributions of P1, P2 and P3, whose weight-average molecular weights by gel permeation chromatography were 9000, 5500 and 69000, respectively. Their lamellar layer structures and pi-pi intermolecular stacking were demonstrated by two-dimensional grazing-incidence X-ray diffraction (2D-GIXRD), showing the edge-on chain conformation. At last, the materials were perfectly adopted to fabricate the high-performance organic field-effect transistor (OFET) devices, which revealed that these compounds would possess a great prospect as semiconductors.
      PubDate: 2017-09-30T07:05:26.122665-05:
      DOI: 10.1002/asia.201701061
       
  • Side Chain-Directed Dispersion of MoS2 Nanosheets by V-Shaped Polyaromatic
           Compounds
    • Authors: Atsushi Matsumoto; Keisuke Jono, Munetaka Akita, Michito Yoshizawa
      Abstract: Bulk molybdenum disulfide (MoS2) itself is virtually insoluble in common organic solvents because of the tight stacks of multiple MoS2 nanosheets. Here we report that V-shaped polyaromatic compounds with non-ionic side chains can efficiently exfoliate and disperse the inorganic nanosheets. Simple grinding and sonication (less than total 1 h) of MoS2 powder with the V-shaped compounds gave rise to large MoS2 nanosheets highly dispersed in NMP through efficient host-guest S-π and hydrophobic interactions. DLS and AFM analyses revealed that the lateral sizes (ca. 150-270 nm) and thicknesses (ca. 2-8 nm) of the products depend on the identity of the non-ionic side chains on the V-shaped dispersant.
      PubDate: 2017-09-27T21:35:30.18398-05:0
      DOI: 10.1002/asia.201701199
       
  • Transition-Metal-Free Reaction of Aryltrimethylammonium Iodides with
           Arylzinc Reagents
    • Authors: Wei-Can Dai; Zhong-Xia Wang
      Abstract: Reaction of aryltrimethylammonium iodides with arylzinc chlorides in the absence of a transition metal catalyst to form biaryl compounds was performed under mild conditions. The reaction was suitable for a broad scope of substrates and exhibited good compatibility of functional groups. Mg2+ ion was demonstrated to markedly promote the reaction.
      PubDate: 2017-09-27T10:21:25.732102-05:
      DOI: 10.1002/asia.201701342
       
  • Near-Infrared Emissive Amphiphilic BODIPY Assemblies Manipulated by
           Charge-Transfer Interaction: From Nanofibers to Nanorods and Nanodisks
    • Authors: Guichao Kuang; Jiafu Yin, Yi Hu, Huan Wang, Zhong Jin, Yi Zhang
      Abstract: A novel near-infrared (NIR) emissive amphiphilic BODIPY derivative BBDP has been successfully prepared and thoroughly characterized. The photophysical properties in various organic solvents and THF/H2O mixtures with different fractions of water were both investigated. BBDP could self-assemble into nanofibers in the water environment due to the amphiphilic property. By utilizing the charge-transfer interaction, BBDP could co-assemble with perylene bisimide derivative (PBI) and viologen derivative (MV) respectively to generate two superamphiphiles. Such two superamphiphiles were able to aggregate in water media at appropriate concentration. BBDP-PBI charge-transfer complex formed nanorods while BBDP-MV aggregates expressed disk-like morphology. This research paves a new way for us to manipulate the dyes assemblies' morphology
      PubDate: 2017-09-27T03:22:28.108668-05:
      DOI: 10.1002/asia.201701323
       
  • Copper-Catalyzed Alkynylboration of Alkenes with Diboron Reagents and
           Bromoalkynes
    • Authors: Tian-Jun Gong; Shang-Hai Yu, Kuan Li, Wei Su, Xi Lu, Bin Xiao, Yao Fu
      Abstract: A new and efficient method for the synthesis of homopropargylboronates by copper-catalyzed alkynylboration of alkenes with diboron reagents and bromoalkynes has been developed. The alkynylboration reaction features high selectivity and efficiency, mild reaction conditions, wide substrate scope, and functional-group compatibility, and is a highly attractive complement to existing methods for the synthesis of homopropargylboronates. Both the boryl and alkynyl groups are good potential functional groups, for the subsequent manipulations which provide an efficient access to a variety of important molecule structures.
      PubDate: 2017-09-26T08:20:30.49013-05:0
      DOI: 10.1002/asia.201701176
       
  • Solvent-Driven Iodine-mediated Oxidative Strategies for the Synthesis of
           Bis(imidazo[1,2-a]pyridin-3-yl)sulfanes and Disulfanes
    • Authors: S. M Abdul Shakoor; Devesh S Agarwal, Sadhika Khullar, Sanjay K Mandal, RAJEEV Sakhuja
      Abstract: Two efficient, economic, one-pot, iodine-mediated strategies are described to access bis(imidazo[1,2-a]pyridin-3-yl)sulfanes and bis(imidazo[1,2-a]pyridin-3-yl)disulfanes in chloroform and acetic acid respectively, via direct oxidative homocoupling of imidazo-heterocycles using in-expensive sodium sulfide as a sulfur source. These strategies are scalable, and an array of substrates delivered their corresponding stable sulfur bridged imidazo-heterocycles in excellent yields.
      PubDate: 2017-09-26T06:26:34.070986-05:
      DOI: 10.1002/asia.201701274
       
  • Cuboid Ni2P as a bifunctional catalyst for efficient hydrogen generation
           
    • Authors: Wei Luo; Yeshaung Du, Chao Liu, Gongzhen Cheng
      Abstract: The design of high-performance catalysts for hydrogen generation is highly desirable for the upcoming hydrogen economy. Herein, we report the colloidal synthesis of nanocuboid Ni2P via thermal decomposition of nickel chloride hexahydrate (NiCl2∙6H2O) and trioctylphosphine (TOP). The obtained nanocuboid Ni2P are characterized by powder X-ray diffraction (XRD), transmission electron microscope (TEM), energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). For the first time, the as-synthesized nanocuboid Ni2P is used as bifunctional catalyst for hydrogen generation from hydrolysis of ammonia borane and electrocatalytic hydrogen evolution. Thanks to the strong synergistic electronic effect between Ni and P, the as-synthesized Ni2P exhibits superior catalytic performance in comparison to its counterpart without P doping.
      PubDate: 2017-09-26T05:21:03.386556-05:
      DOI: 10.1002/asia.201701302
       
  • Dynamic Mg2B8 Cluster: A Nanoscale Compass
    • Authors: Hua-Jin Zhai; Ying-Jin Wang, Lin-Yan Feng, Jin-Chang Guo
      Abstract: Boron-based binary cluster Mg2B8 is shown to adopt a compass-like structure via computational global searches, featuring an Mg2 dimer as the needle and a disk-shaped B8 molecular wheel as baseplate. The nanocompass has a diameter of 0.35 nm. Born-Oppenheimer molecular dynamics simulations indicate that Mg2B8 is structurally fluxional with the needle rotating freely on the baseplate, analogous to a functioning compass. The dynamics is readily initiated via a ultrasoft vibrational mode. The rotational barrier is only 0.1 kcal mol-1 at the single-point CCSD(T) level. Chemical bonding analysis suggests that the cluster compass can be formulated as [Mg2]2+[B8]2-; that is, the baseplate and the needle are held together primarily through ionic interactions. The baseplate is doubly aromatic with pi and sigma sextets. The bonding pattern provides dilute, continuous, and delocalized electron cloud, which underlies the dynamics of the nanocompass.
      PubDate: 2017-09-26T05:20:54.884119-05:
      DOI: 10.1002/asia.201701310
       
  • The Study on Six Green Insensitive High Energetic Coordination Polymers
           Based on Alkali/Alkali-earth Metals and
           4,5-Bis(tetrazol-5-yl)-2H-1,2,3-triazole
    • Authors: Dong Chen; Dong Jing, Qi Zhang, Xianggui Xue, Shaohua Gou, Hongzhen Li, Fude Nie
      Abstract: Constructing insensitive high-performance ECPs with alkali/alkali-earth metal ions and nitrogen-rich organic backbone has been proved a feasible strategy in this work. Six diverse dimensional novel ECPs (Compounds 1-6) were successfully synthesized from Na(I), Cs(I), Ca(II), Sr(II), Ba(II) ions and a nitrogen-rich triheterocyclic 4,5-Bis(tetrazol-5-yl)-2H-1,2,3-triazole (H3BTT). All compounds show outstanding stability and low sensitivity, the thermal stability of these ECPs are significantly improved as the structural reinforcement increased from 1D to 3D, in which the decomposition temperature of 3D Ba(II) based compound 6 is as high as 397 oC. Long-term storage experiments show that compounds 5 and 6 are stable enough in high temperature. Moreover, Six compounds hold considerable detonation performances, in which Ca(II) based compound 5 possesses the detonation velocity of 9.15 km/s, along with the detonation pressure of 39.66 Gpa, exceeding those of most energetic coordination polymers. Burn test further certifies six compounds can be versatile pyrotechnics.
      PubDate: 2017-09-23T11:20:43.441358-05:
      DOI: 10.1002/asia.201701052
       
  • (Azulene-1,3-diyl)-bis(nitronyl nitroxide) and -bis(iminonitroxide) and
           Their Copper Complexes
    • Authors: Keiji Okada; Makoto Haraguchi, Evgeny Tretyakov, Nina Gritsan, Galina Romanenko, Dmitry Gorbunov, Artem Bogomyakov, Kseniya Maryunina, Shuichi Suzuki, Masatoshi Kozaki, Daisuke Shiomi, Kazunobu Sato, Takeji Takui, Sadafumi Nishihara, Katsuya Inoue
      Abstract: In contrast to diradicals connected by alternant hydrocarbons, only a few studies on those connected by nonalternant hydrocarbons have been reported. The syntheses, structures, and magnetic properties of azulene-1,3-diyl linked bis(nitronyl nitroxide) (NN2Az) and bis(iminonitroxide) (IN2Az) diradicals and their Cu(hfac)2 complexes were investigated. NN2Az was shown to have an intramolecular ferromagnetic interaction with Jobs/kB = +10.0 K (H = 2JS1S2) between (nitronyl nitroxide) spins, whereas IN2Az was estimated to have a much weaker intramolecular magnetic interaction. The reactions of NN2Az and IN2Az with Cu(hfac)2 gave a 1:2 [(Cu(hfac)2)2(NN2Az)] complex and a 1:1 [Cu(hfac)2(IN2Az)]*C6H12 complex, respectively. [(Cu(hfac)2)2(NN2Az)] showed strong intramolecular AF interactions (J1-Cu-R/kB  -800 K, J2-Cu-R/kB  -500 K) were observed between the Cu(II)- and the coordinating NN-spins, while [Cu(hfac)2(IN2Az)] exhibited a ferromagnetic exchange interaction (Jobs-Cu-R/kB = +114 K) between the Cu(II)- and the imino-coordinated iminonitroxide-spins.
      PubDate: 2017-09-22T03:22:17.014993-05:
      DOI: 10.1002/asia.201701085
       
  • One-pot green synthesis of N-doped carbon quantum dots for cell nucleus
           labelling and copper (Ⅱ) detection
    • Authors: Jiliang Ci; Ye Tian, Shigenori Kuga, Zhongwei Niu, Min Wu, Yong Huang
      Abstract: The doping of nitrogen into carbon quantum dots was vitally important for improvement of fluorescence performance. However, the synthesis of nitrogen-doped carbon quantum dots (N-CQDs) was usually conducted under strong acid and high temperature, which would result in the environmental pollution and energy consumption. Herein, the N-CQDs were prepared by a mild one-pot hydrothermal process. The hydrothermal reaction temperature was adjusted to control the particle size, N/C atomic ratio and quantum yield. The products were water-soluble with narrow particle size distribution and good dispersion stability in wide pH range. The N-CQDs could penetrate into HeLa cell nucleus without any further functionalization. Moreover, the fluorescence of N-CQDs could be selectively quenched by Cu2+, suggesting application of detecting Cu2+ in human plasma.
      PubDate: 2017-09-21T05:21:17.848052-05:
      DOI: 10.1002/asia.201700880
       
  • HMPA-Promoted Siladifluoromethylation of Di-, and Triarylmethanes with
           Ruppert−Prakash Reagent
    • Authors: Song Cao; Xinfei Ji, Xianghu Zhao, Hongyan Shi
      Abstract: A novel and mild method for the synthesis of -siladifluoromethylated di-, and triarylmethanes via the reaction of di-, and triarylmethanes with Ruppert−Prakash reagents with the assistance of LDA and HMPA at room temperature was developed.
      PubDate: 2017-09-21T05:20:41.082235-05:
      DOI: 10.1002/asia.201701224
       
  • Single Microbead-Anchored Fluorescent Immunoassay (SMFIA): A Facile and
           Versatile Platform Allowing Simultaneous Detection of Multiple Antigens
    • Authors: Chenghui Liu; Desheng Chen, Xiaobo Zhang, Liping Zhu, Zhengping Li
      Abstract: A new concept of single microbead (MB)-anchored fluorescent immunoassay (SMFIA) is proposed with greatly improved sensitivity. In the SMFIA, a single MB is manipulated as the reaction carrier so that the target-tethered fluorescent immunocomplexes will be highly concentrated on one MB. By monitoring the enriched fluorescence signal on the single MB through imaging, highly sensitive target quantification can be realized just by employing the most common sandwich immunoreactions without requirement of further signal amplification routes. The high sensitivity of the SMFIA can fully meet the demand of current medical diagnosis. Furthermore, we have further advanced a fluorescence-encoding mechanism for the proposed SMFIA which allows the simultaneous detection of multiple antigens in a single reaction. Sharing the distinct advantages of simple operation, high sensitivity and multiplexed detection capability, the SMFIA provides a general platform for the detection of various biomarkers.
      PubDate: 2017-09-20T07:22:19.61397-05:0
      DOI: 10.1002/asia.201701245
       
  • Cobalt-catalyzed Cross-dehydrogenative C(sp2)-C(sp3) Coupling of
           Oxazole/Thiazole with Ether or Cycloalkane
    • Authors: Xiaojiao Wang; Bowen Lei, Lifang Ma, Lisi Zhu, Xinyue Zhang, Hao Zuo, Dailin Zhuang, Ziyuan Li
      Abstract: Direct C5-alkylation of oxazole/thiazole with ether or cycloalkane has been achieved through a cobalt-catalyzed cross-dehydrogenative couling (CDC) process in moderate to good yields. This transformation represents the first C(sp2)-C(sp3) cross-coupling at the C5-position of azole via double C-H bond cleavages. Various functional groups on oxazole/thiazole substrates, as well as water and air, are well-tolerated with this concise and practical protocol, constituting straightforward access to heterocycles with great medicinal significance. A preliminary mechanism involving radical process has also been proposed.
      PubDate: 2017-09-19T22:40:27.962056-05:
      DOI: 10.1002/asia.201701258
       
  • Stimulus-Induced Conformational Transformation of Cyclic Peptide for
           Selective Cell Targeting On-Off Gatekeeper of Mesoporous Nanocarrier
    • Authors: Jeonghun Lee; Eun-Taex Oh, Jaehun Song, Ha Gyeong Kim, Heon Joo Park, Chulhee Kim
      Abstract: The αvβ3 integrin is upregulated on many cancer cells. We designed a dual functional cyclic peptide gatekeeper with a capability of stimuli-responsive conformational transformation which could serve as a selective cell targeting on-off gatekeeper for mesoporous nanocarriers. The advantage of employing the motif of stimuli-induced conformational transformation of cyclic peptides is that they could be utilized not only as an on-off gatekeeper for the triggered release of cargo drugs but also as a targeting ligand of the carriers to desired cells with their respective binding receptors. The peptide gatekeepers on the surface of nanocarriers exhibited on-off gatekeeping via conformational transformation triggered by intracellular glutathione levels of the cancer cells. The cyclic RGD sequence of the peptide gatekeepers enhanced the intracellular uptake into the tumor cells (A549) and the therapeutic efficacy of the nanocarrier.
      PubDate: 2017-09-17T21:31:20.08478-05:0
      DOI: 10.1002/asia.201701050
       
  • NIR Absorbing Donor-Acceptor Based 1,1,2,2-Tetracyanobutadiene (TCBD) and
           Cyclohexa-2,5-Diene-1,4-Ylidene-Expanded TCBD Substituted
           Ferrocenyl-Phenothiazines
    • Authors: Rajneesh Misra; Madhurima Poddar
      Abstract: A series of unsymmetrical (D-A-D1, D1-π-D-A-D1 and D1-A1-D-A2-D1) and symmetrical (D1-A-D-A-D1 ) type of phenothiazines 4b, 4c and 5b-5f were designed and synthesized by [2 + 2] cycloaddition-retroelectrocyclization reaction of ferrocenyl substituted phenothiazines with tetracyanoethylene (TCNE) and 7,7,8,8-tetracyanoquinodimethane (TCNQ). The photophysical, electrochemical and computational studies show strong charge-transfer (CT) interaction in the phenothiazine derivatives which can be tuned by the variation of number of TCNE/TCNQ acceptors. The phenothiazines 4b, 4c and 5b-5f show red shifted absorption in 400-900 nm region, resulting in lower band gap which is supported by TD-DFT calculations. The electrochemical study exhibits reduction waves at low potential due to strong 1,1,2,2-tetracyanobutadiene (TCBD) and cyclohexa-2,5-diene-1,4-ylidene-expanded TCBD acceptors. The incorporation of cyclohexa-2,5-diene-1,4-ylidene-expanded TCBD stabilizes LUMO energy level to greater extent as compared to TCBD.
      PubDate: 2017-09-13T03:27:29.299455-05:
      DOI: 10.1002/asia.201700879
       
  • Cancer-targeted Selenium Nanoparticles Sensitize Cancer Cells to
           Continuous γ Radiation to Achieve Synergetic Chemo-Radiotherapy
    • Authors: Leung Chan; Lizhen He, Binwei Zhou, Shouhai Guan, Mingjun Bo, Yahui Yang, Ying Liu, Xiao Liu, Yanyang Zhang, Qiang Xie, Tianfeng Chen
      Abstract: Cancer radiotherapy with 125I seeds demonstrates long-term higher efficacy and lower side effects than traditional X-ray radiotherapy due to its low-dose and continuous radiation but is still limited by radioresistance in clinical applications. Therefore, the design and synthesis for sensitizers that could enhance the sensitivity of cancer cells to 125I seeds is of great importance for future radiotherapy. Selenium nanoparticles (SeNPs) have been found to exhibit high potential in cancer chemotherapy and as drug carriers. In this study, we found that, based on the Auger-electron effect and Compton effect of Se atoms, cancer-targeted SeNPs in combination with 125I seeds achieve synergetic effects to inhibit cancer cell growth and colony formation through induction of cell apoptosis and cell cycle arrest. Detailed studies on the action mechanisms reveal that the combined treatments effectively activate intracellular ROS overproduction to regulate p53-mediated DNA damage apoptotic signalling pathways and MAPKs phosphorylation and to prevent the self-repair of cancer cells simultaneously. Taken together, the combination of SeNPs with 125I seeds could be further exploited as a safe and effective strategy for next-generation cancer chemo-radiotherapy in clinical applications.
      PubDate: 2017-09-11T10:41:11.165485-05:
      DOI: 10.1002/asia.201701227
       
  • Room-temperature Synthesis of Amorphous Molybdenum Oxide Nanodots with
           Tunable Localized Surface Plasmon Resonances
    • Authors: Chuanhui Zhu; Qun Xu, Liang Ji, Yumei Ren, Mingming Fang
      Abstract: Two dimensional (2D) semiconductors have recently emerged as a remarkable class of plasmonic alternative to conventional noble metals. However, tuning of their plasmonic resonances towards different wavelengths in the visible light region with physical or chemical method still remains challenging. In this work, we design a simple room-temperature chemical reaction route to synthesize the amorphous molybdenum oxide (MoO3-x) nanodots that exhibit strong localized surface plasmon resonances (LSPR) in the visible and near infrared region. Moreover, tunable plasmon resonances can be achieved in a wide range with the changing solvent surrounding, and accordingly the photoelectrocatalytic activity can be optimized with the varying LSPR peaks. So this work boosts the light matter interaction at the nanoscale and could enable photodetectors, sensors, and photovoltaic devices in the future.
      PubDate: 2017-09-08T07:41:53.735471-05:
      DOI: 10.1002/asia.201701170
       
  • In Situ Fabricating Inorganic/Organic Hybrid Based on Cu/Co-ZIF and Cu2O
    • Authors: Tianlong Wang; Hong Ma, Jin Gao, Xinhong Wang, Yuxia Sun, Yang Luo, Shujing Zhang, Jie Xu
      Abstract: We successfully fabricate well-defined inorganic/organic hybrid Cu2O@Cu/Co-ZIF (ZIF = zeolitic imidazolate frameworks) by use of growth of dual-metal Cu/Co-ZIF on the performed Cu2O hollows. The key point of the strategy is coupling the in situ self-sacrifice of Cu2O and the coordination of metal ions (Cu+ and Co2+) with 2-methylimidazole. This new hybird was characterized by powder X-ray diffraction, (scanning) transmission electron microscopy, energy dispersive spectrometer mapping, in situ FT-IR spectroscopy, UV-Vis diffuse reflection spectroscopy, N2 sorption measurements, and electron spin resonance. It was evidenced that Cu/Co-ZIF nanocrystals have been assembled to contineous shells surround the Cu2O cores as well as in the voids between layers and inner pores. Cu2O@Cu/Co-ZIF exhibits visible light responsibility and potentially as narrow band gap semiconductor and visible photocatalyst.
      PubDate: 2017-09-08T01:20:32.339598-05:
      DOI: 10.1002/asia.201701189
       
  • Improved Electrochemical Cycling Durability in a Nickel Oxide double layer
           film
    • Authors: Shuai Hou; Xiang Zhang, Yanlong Tian, Jiupeng Zhao, Hongbin Geng, Huiying Qu, Hangchuan Zhang, Kun Zhang, Binsheng Wang, A. I. Gavrilyuk, Yao Li
      Abstract: For the first time, a crystalline-amorphous double-layered NiOx film has been prepared by reactive radio frequency magnetron sputtering, which has exhibited improved electrochemical cycling durability, whereas other electrochromic parameters have been maintained at the required level, i.e. the short coloration/bleaching time (0.8s/1.1s) and an enhanced transmittance modulation range (62.2%) at the wavelength of 550 nm. Besides this, the double-layered film has shown the best reversibility as compared with amorphous and crystalline single-layer films.
      PubDate: 2017-09-07T03:20:43.824102-05:
      DOI: 10.1002/asia.201700994
       
  • Current Advances in Quantum Dots-Based Photoelectrochemical Immunoassays
    • Authors: Dianping Tang; Jian Shu
      Abstract: As a newly developing technique, the PEC immunoassay has drawn a great attention in recent years because of its low cost and desirable sensitivity. Since the detecting signal originates from photoelectric conversion of photoelectric materials, the appearance and application of QDs that process unique photophysical properties and regulated optoelectronic characteristics, take the development of PEC immunoassay to a new height. This review concisely introduces the general mechanism of QDs-based photoelectric conversion for immunoassay and summarizes the current advances of QDs applications in immunoassay. Considering the signal strategies and photoactive materials are the key elements in the PEC biosensor system, we highlight the state-of-the-art signaling strategies and various applications of QDs in PEC immunoassay to comprehensive introduce the advance of QDs-based PEC immunoassay. Finally, the challenge and future developmental trend are briefly discussed.
      PubDate: 2017-09-07T02:20:25.781815-05:
      DOI: 10.1002/asia.201701229
       
  • A Multiple-Stimulus Responsive Biomimetic Assembly Based on
           Polyisocyanopeptide and Conjugated Polymer
    • Authors: Fanfan Meng; Chengfen Xing, Hongbo Yuan, Yibing Fan, Ran Chai, Yong Zhan
      Abstract: An assembly has been fabricated and indicated as a multiple-stimulus responsive biomimetic hybrid polymer architecture. It was constructed by the hydrophobic interactions between the conjugated polyfluorene containing 2,1,3-benzothia-diazole units (PFBT) and the tri(ethylene glycol)-functionalized polyisocyanopeptide (3OEG-PIC). The introduction of PFBT to the polyisocyanopeptide (PIC) network allows for the incorporation of multiple-stimulus responsiveness including temperature, CO2, carbonic anhydrase and nonlinear mechanics, which mimics the natural processes and interactions. Furthermore, the light-harvesting and signal amplification characteristics of PFBT endow the supramolecular assembly with the essential function of fluorescence monitoring for the biological process.
      PubDate: 2017-09-04T05:19:01.841611-05:
      DOI: 10.1002/asia.201701280
       
  • Controlled synthesis of 3D flower-like Ni2P composed by mesoporous
           nanoplates for overall water-splitting
    • Authors: Ge Wang; Haiyan Zheng, Xiubing Huang, Zhenyu Wu, Hongyi Gao, Wenjun Dong
      Abstract: Developing efficient non-noble metal and earth-abundant electrocatalysts with tunable microstructure for overall water-splitting is critical to promote the clean-energy technologies for hydrogen economy. Herein, novel three-dimensional (3D) flower-like Ni2P composed by mesoporous nanoplates with controllable morphology and high surface area was prepared by a hydrothermal method and low-temperature phosphidation as efficient electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Comparing with the scamps-like NixPy, the 3D flower-like Ni2P with a diameter of 5 μm presented efficient and stable catalytic performance in 0.5 M H2SO4, with a small Tefal slope of 79 mV dec-1 and an overpotential of ~ 240 mV at a current density of 10 mA cm-2 with a mass loading density of 0.283 mg cm-2. Besides, the catalyst also exhibited a remarkable performance for OER in 1.0 M KOH electrolyte, with the overpotential of 320 mV to reach current density of 10 mA cm-2 and a small Tafel slope of 72 mV dec-1. The excellent catalytic performance of as-prepared Ni2P may be ascribed to its novel 3D morphology with unique mesoporous structure
      PubDate: 2017-09-01T04:20:37.721382-05:
      DOI: 10.1002/asia.201701255
       
  • Recent developments in lanthanide single-molecule magnets
    • Authors: Jingjing Lu; Mei Guo, Jinkui Tang
      Abstract: Single-molecule magnets (SMMs) exhibiting slow relaxation of magnetization of purely molecular origin are highly attractive owing to their potential applications in spintronic devices, high-density information storage and quantum computing. Particularly, lanthanide SMMs have been playing a major role in the advancement of this field because of the large intrinsic magnetic anisotropy of lanthanide metal ions. In this Focus Review, some recent breakthroughs that are changing the perspective of the field will be highlighted with special emphasis on the synthetic strategies towards the design of high-performance SMMs.
      PubDate: 2017-09-01T04:20:32.506751-05:
      DOI: 10.1002/asia.201701032
       
  • Control synthesis of PbS-TiO₂ hollow hybrid structures through ion
           adsorption-heating progress and their photocatalytic activity
    • Authors: hongbo xia; Suli Wu, shufen zhang
      Abstract: Hollow hybrid nanostructure has received significant attention because of its unique structural features. This study reports a facile "ion adsorption-heating" method to fabricate PbS-TiO₂ hybrid hollow particles. In this method, the TiO₂ spheres used as substrate material to grow PbS are aggregates of many small amorphous TiO₂ particles, and each of the small particles is covered by thioglycollic acid ligands through Ti4+-carboxyl coordination. When the Pb2+ ions were added into the TiO₂ spheres colloidal solution, these ions can be adsorbed by sulfydryl (-SH) groups to form metal thiolate, and the C-S bond will be dissociated by heating to release S2-. Then, the S2- will react with Pb2+ ions to form PbS without additives as sulfur sources. Meanwhile, the amorphous TiO₂ spheres were transformed into anatase phase during the heating process. As a result, the crystallization of TiO₂ spheres along with the formation of PbS was simultaneously carried out by heating. During the heating process, owing to the Kirkendall effect of S2- diffusion and Ostwald ripening effect of the crystallization of amorphous TiO₂ spheres, PbS-TiO₂ hollow hybrid structure can be obtained. The XRD and XPS characterizations proved the formation of anatase TiO₂ and PbS. The characterization of TEM confirmed the formation of the hollow structure of PbS-TiO₂ hybrid sample. The photocatalytic activity of the PbS-TiO₂ hollow hybrid spheres have been investigated by the degradation of Cr6+ under visible light. The results show that PbS-TiO₂ hollow hybrid spheres exhibited highest photocatalytic activity, in which almost all the Cr6+ were degraded after 140 min.
      PubDate: 2017-08-31T03:21:03.793634-05:
      DOI: 10.1002/asia.201701204
       
  • The forgotten nitro-aromatic phosphines as weakly donating P- ligands: a
           N-aryl-benzimidazolyl series in RhCl(CO) complexes
    • Authors: Chonhwei Zhu; Emmanuel Gras, Carine Duhayon, Francis Lacassin, Xiuling Cui, Remi Chauvin
      Abstract: The coordination chemistry of the a priori weakly -donating nitro-aromatic phosphines is addressed through a series of nitro-substituted (N-phenyl-benzimidazol-1-yl)diphenylphosphines in Rh(I) complexes. From a set of seven such phosphines L = Lxyz(') (x, y, z = 0 or 1 = number of NO2 substituent at the 5, 6 and N-Ph para positions, respectively), including the non-nitrated parent L000 and its dicationic N-methyl counterpart L000', three LRhCl(COD) and seven L2RhCl(CO) complexes have been obtained in 72-95 % yield. Despite of a cis orientation of the L and CO ligands, the C=O IR stretching frequency CO varies in the expected sense, from 1967 ± 1 cm-1 for Lxy0 to 1978 ± 1 cm-1 for Lxy1, and 2005 cm-1 for L000'. The 103Rh NMR chemical shift Rh varies from -288 ppm for L000 to -316 ± 1 ppm for L10z or L01z, and -436 ppm for L000'. The CO and Rh probes thus reveal moderate but systematic variations, and act as "orthogonal" spectroscopic indicators of the presence of nitro groups on the N-Ph group and the benzimidazole core, respectively. For the dicationic ligand L000', a tight electrostatic sandwiching of the Rh-Cl bond by the benzimidazole moities is evidenced by X-ray crystallography (RhCl-…CN2+ ≈ 3.01 Å). Along with the LRhCl(CO) complexes, dinuclear side-products (µ-CO)(RhClL)2 were also obtained in low spectroscopic yield: for the dinitro ligand L = L011, a unique 1:6.7 clathrate structure, with dichloromethane as solvate, is also revealed by X-ray crystallography.
      PubDate: 2017-08-28T05:26:45.692054-05:
      DOI: 10.1002/asia.201701078
       
  • Computer-assisted design of imidazolate-based ionic liquids for improving
           SO2 capture, CO2 capture, and SO2/CO2 selectivity
    • Authors: Guokai Cui; Ning Zhao, Jianji Wang, Congmin Wang
      Abstract: A new strategy using computer-assisted design of substituted imidazolate-based ionic liquids (ILs) through tuning the absorption enthalpy as well as the basicity of ILs for improving SO2 capture, CO2 capture, and SO2/CO2 selectivity was reported. The best substituted imidazolate-based ILs as absorbents for different applications were predicted at first. During the absorption, a high SO2 capacity up to 5.28 and 2.38 mole SO2 per mole IL could be achieved by ILs with CH3-imidazolate anion under 1.0 and 0.1 bar, respectively, through tuning multiple N∙∙∙S interactions between SO2 and N atoms in the imidazolate anion with different substituent. In addition, CO2 capture by imidazolate-based ILs could also be easily tuned through changing the substitute of ILs, and Br-imidazolate IL showed the high CO2 capacity but low absorption enthalpy. Furthermore, the high selectivity for SO2/CO2 could be reached by imidazolate-based ILs with CN-imidazolate anion due to their high SO2 capacity but low CO2 capacity. The results put forward in this work are in good agreement with the prediction. Quantum chemical calculations, FT-IR and NMR analysis methods were used to discuss SO2 and CO2 absorption mechanism.
      PubDate: 2017-08-24T22:35:33.336058-05:
      DOI: 10.1002/asia.201701215
       
  • Two Series of Homodinuclear Lanthanide Complexes: Greatly Enhancing the
           Energy Barriers through Tuning the Terminal Solvent Ligands in Dy2
           Single-Molecule Magnets
    • Authors: Yahong Li; Yaru Qin, haifeng Zhang, Hao Sun, Yangdan Pan, Yu Ge, Yiquan Zhang
      Abstract: The utilization of 2-ethoxy-6-(((2-hydroxy-3-methoxy benzyl)imino)methyl)phenol (H2L) as a chelating ligand, in combination with the employment of alcohols (EtOH and MeOH) as auxiliary ligands, in the 4f-metal chemistry afforded two series of dinuclear lanthanide complexes of compositions [Ln2L2(NO3)2 (EtOH)2] (Ln = Sm (1), Eu (2), Gd (3), Tb (4), Dy (5), Ho (6), Er (7)) and [Ln2L2(NO3)2(MeOH)2] (Ln = Sm (8), Eu (9), Gd (10), Tb (11), Dy (12), Ho (13), Er (14)). Complexes 1-7 are isomorphous. The two LnIII ions in 1-7 are doubly bridged by two deprotonated aminophenoxide oxygen atoms of two μ2: η0:η1:η2:η1:η1:η0 L2- ligands. One nitrogen atom, two oxygen atoms of NO3- anion, two methoxide oxygen atoms of two ligand sets, and one oxygen atom of the terminal-coordinated EtOH molecule complete the distorted dodecahedron geometry of each LnIII ion. Compounds 8-14 are isomophous and their structures are similar to those of 1-7. The slight difference between 1-7 and 8-14 stems from purposefully replacing the EtOH ligands in 1-7 with MeOH in 8-14. Dc magnetic susceptibility studies in the 2-300 K range reveal probably weak antiferromagnetic interactions for 3, 4, 7, 10, 11, and 14, and ferromagnetic interactions at low temperature for 5, 6, 12, and 13. Complexes 5 and 12 exhibit SMM behavior with energy barriers of 131.3 K for 5 and 198.8 K for 12, respectively. Namely, the energy barrier is significantly enhanced by dexterously regulating the terminal ligands. To rationalize the observed difference in the magnetic behavior, complete-active-space self-consistent field (CASSCF) calculations were performed on two Dy2 complexes. Subtle variation in the angle θ between the magnetic axes and the vector connecting two DyIII ions results in the weaker influence on the tunneling gap of individual DyIII ions by the dipolar field in 12. This work proposes an efficient strategy for synthesizing Dy2 SMMs with high energy barriers.
      PubDate: 2017-08-24T21:35:50.847251-05:
      DOI: 10.1002/asia.201701065
       
  • Nanocarbons for Catalytic Desulfurization
    • Authors: Qingqing Gu; Yangming Lin, Saskia Heumann, Dangsheng Su
      Abstract: : Nanocarbon catalysts are green and sustainable alternatives to the metal-based catalysts for numerous catalytic transformations. The application of nanocarbons for environmental catalysis is an emerging research discipline and has undergone rapid development in recent years. In this focus review, we provide a critical analysis on the state-of-the-art nanocarbon catalysts for three different catalytic desulfurization processes. And the focus is on the advantage and limitation as well as the reaction mechanism of the nanocarbon catalysts at molecular level.
      PubDate: 2017-08-24T12:35:21.397071-05:
      DOI: 10.1002/asia.201700995
       
  • Impact of Linear Alkyl Length on Assembly of Twisted Perylene Bisimides:
           from Molecular Arrangement to Nanostructures
    • Authors: Zongxia Guo; Kun Wang, Ping Yu, Xiangnan Wang, Shusha Lan, Kai Sun, Yuanping Yi, Zhibo Li
      Abstract: Length effect of linear alkyl chains substituted at imine positions on the assembly of tetrachlorinated perylene bisimides (1, PBI with -C6H13; 2, PBI with -C12H25) has been investigated. Solvent-induced assembly was performed in solutions mixed by THF and methanol via varying their volume ratios. Morphological (SEM, AFM and TEM) and spectral (UV-vis, FL, FTIR and XRD) methods were used to characterize the assembled nanostructures and the molecular arrangement in the aggregates. It was found that uniform structures could be obtained for both molecules in solutions with high ratio of methanol, although 1 preferred to form rigid nanosheets while 2 assembled into more long stripes with high ratio of length to width. Combined the nanostructures with the spectral data, it was suggested that the π-π stacking predominated in assemblies for 1, and synergetic effect of Van der Waals from the long alkyl chains and π-πstacking between neighbouring building blocks facilitated the growth of long range ordered nanostructures of 2. Then via changing the linear chain length, the hierarchical assembly of PBIs modified on bay positions could be manipulated effectively.
      PubDate: 2017-08-18T07:01:25.504338-05:
      DOI: 10.1002/asia.201700984
       
  • Programmed Site-selective direct Palladium Catalyzed Arylations of
           Thieno[3,2-b]thiophene
    • Authors: Tung Thanh Dang; Thi Minh Ha Vuong, Hien Nguyen, Didier Villemin, Thanh Tin Le, Hung Huy Nguyen
      Abstract: Mono-, di-, tri- and tetra-arylated thieno[3,2-b]thiophenes were synthesized by direct site-selective Pd-catalyzed C-H activation reactions with various aryl bromides in the presence of a phosphine-free Pd(OAc)2/KOAc catalyst system in DMAc. The arylation of 2-arylthieno[3,2-b]thiophen¬e took place at the C-3 position when the 2-aryl substituents bear electron-withdrawing groups, and at the C-5 position when they are bulky and possess electron-donating groups
      PubDate: 2017-06-01T04:20:26.568113-05:
      DOI: 10.1002/asia.201700562
       
  • Corrigendum: Reductive Homocoupling of Organohalides Using Nickel(II)
           Chloride and Samarium Metal
    • Authors: Yongjun Liu; Shuhuan Xiao, Yan Qi, Feng Du
      Pages: 2873 - 2873
      PubDate: 2017-11-02T03:34:40.759765-05:
      DOI: 10.1002/asia.201701380
       
 
 
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