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    Artificial light-harvesting supramolecular polymeric nanoparticles formed by pillar[5]arene-based host-guest interaction.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China.
    Artificial light-harvesting nanoparticles were prepared from supramolecular polymers comprised of pillar[5]arene with anthracene-derived donors and acceptors through host-guest interactions. The resulting water-dispersible nanoparticles displayed efficient energy transfer and excellent light harvesting ability in part because the steric bulk of pillar[5]arene suppressed the self-quenching of the chromophores. Read More

    Microwave-induced covalent functionalization of few-layer graphene with arynes under solvent-free conditions.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Chemical and Pharmaceutical Sciences, University of Trieste, Piazzale Europa, 1, 34127 Trieste, Italy. and CIC BiomaGUNE, Parque Tecnológico de San Sebastián, Paseo Miramón, 182, 20014 San Sebastián, Guipúzcoa, Spain. and Basque Foundation for Science, Ikerbasque, 48013 Bilbao, Spain.
    A non-conventional modification of exfoliated few-layer graphene (FLG) with different arynes under microwave (MW) irradiation and solvent-free conditions is reported. The described approach allows reaching fast, efficient and mild covalent functionalization of FLG. Read More

    Nine-step total synthesis of (-)-strychnofoline.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong Province, China. and SUSTech, Grubbs Institute, Shenzhen, Guangdong Province, China.
    Strychnofoline is a Strychnos alkaloid that has unique spirooxindole architecture and possesses important anticancer activity. Here, we have, for the first time, reported the enantioselective synthesis of strychnofoline proceeding in only nine steps from commercially available 6-methoxytryptamine. The efficiency of the synthesis derives from the use of two sequential transformation steps in the catalytic asymmetric construction of the spiro[pyrrolidine-3,3'-oxindole] motif in a facile manner. Read More

    Three-component difluoroalkylation and trifluoromethylthiolation/trifluoromethylselenolation of π-bonds.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, 730000, P. R. China.
    This report describes a new method for three-component difluoroalkylation and trifluoromethylthiolation/trifluoromethylselenolation of π-bonds via air-stable SCF3 and SeCF3 reagents as free-radical initiators of ethyl iododifluoroacetate. β-Proton elimination can be overcome effectively in this reaction system, and a broad substrate scope, including alkenes and alkynes, makes this approach practical and attractive. Read More

    Synthetic cells produce a quorum sensing chemical signal perceived by Pseudomonas aeruginosa.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Sciences, Roma Tre University, Viale G. Marconi 446, I-00146 Rome, Italy.
    Recent developments in bottom-up synthetic biology (e.g., lipid vesicle technology integrated with cell-free protein expression systems) allow the generation of semi-synthetic minimal cells (in short, synthetic cells, SCs) endowed with some distinctive capacities of natural cells. Read More

    Selectivity shift from paraffins to α-olefins in low temperature Fischer-Tropsch synthesis in the presence of carboxylic acids.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Unité de Catalyse et de Chimie du Solide UMR 8181 CNRS, Ecole Centrale de Lille, Université de Lille Bât. C3, 59655 Villeneuve d'Ascq, France. and Eco-Efficient Products and Processes Laboratory (E2P2L), UMI 3464 CNRS-Solvay, Shanghai, P. R. China.
    A shift of selectivity to long chain α-olefins has been observed during Fischer-Tropsch synthesis over Co catalysts in the presence of carboxylic acids. The total selectivity to α-olefins of 39% was obtained in the presence of acids. The effect has been ascribed to intermediate formation of esters which hinder secondary olefin hydrogenation. Read More

    Asymmetric [4+2] annulations to construct norcamphor scaffolds with 2-cyclopentenone via double amine-thiol catalysis.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China. and College of Pharmacy, Third Military Medical University, Shapingba, Chongqing 400038, China.
    An efficient double catalytic system, combining chiral amine and 2-mercaptobenzoic acid, is applied for α',β-regioselective [4+2] annulations of 2-cyclopentenone with a diversity of activated alkenes, constructing multifunctional chiral bicycle[2,2,1]heptane scaffolds in good to excellent yields and enantioselectivities. In comparison with the traditional cross-dienamine species between 2-cyclopentenone and chiral amine, the interrupted enamine intermediate containing a covalently linked thiol catalyst shows significantly improved reactivity. Read More

    Achiral non-fluorescent molecule assisted enhancement of circularly polarized luminescence in naphthalene substituted histidine organogels.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China. and University of Chinese Academy of Sciences, Beijing, 100049, P. R. China and Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin, P. R. China.
    A naphthalene substituted histidine derivative was found to form an organogel showing circularly polarized luminescence (CPL) and the addition of non-fluorescent achiral benzoic acids could efficiently enhance the CPL via non-covalent interactions. Read More

    SpyCatcher-SpyTag mediated in situ labelling of progeny baculovirus with quantum dots for tracking viral infection in living cells.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Key Laboratory of Special Pathogens and Biosafety, Center for Emerging Infectious Diseases, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China.
    A non-invasive labelling strategy is proposed to label baculovirus via genetic insertion of a SpyTag into the viral glycoprotein, followed by specific conjugation with the SpyCatcher protein on modified quantum dots (QDs) through an isopeptide bond. The labelling method is convenient and efficient and shows little attenuation of viral infectivity. Therefore, it is a biologically compatible technique for tracking viral infection. Read More

    A cyanine-based fluorescent cassette with aggregation-induced emission for sensitive detection of pH changes in live cells.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Chemistry, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA.
    An aggregation-induced emission (AIE) cyanine-based fluorescent cassette with a large pseudo-Stokes shift was designed and prepared to sensitively image pH changes in live cells via through-bond energy transfer (TBET) from a tetraphenylethene (TPE) donor to a cyanine acceptor. Read More

    Solvated-electron production using cyanocuprates is compatible with the UV-environment on a Hadean-Archaean Earth.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Astronomy, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.
    UV-driven photoredox processing of cyanocuprates can generate simple sugars necessary for prebiotic synthesis. We investigate the wavelength dependence of this process from 215 to 295 nm and generally observe faster rates at shorter wavelengths. The most efficient wavelengths are accessible to a range of potential prebiotic atmospheres, supporting the potential role of cyanocuprate photochemistry in prebiotic synthesis on the early Earth. Read More

    Oxidation of a [Cu2S] complex by N2O and CO2: insights into a role of tetranuclearity in the CuZ site of nitrous oxide reductase.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., Chicago, IL 60607, USA.
    Oxidation of a [Cu2(μ-S)] complex by N2O or CO2 generated a [Cu2(μ-SO4)] product. In the presence of a sulfur trap, a [Cu2(μ-O)] species also formed from N2O. A [Cu2(μ-CS3)] species derived from CS2 modeled initial reaction intermediates. Read More

    Selective hydrogenation of nitroarenes using an electrogenerated polyoxometalate redox mediator.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK.
    The 2-electron reduced form of the polyoxometalate silicotungstic acid (H4[SiW12O4]) is shown to be an effective and selective hydrogenation agent for a range of nitroarenes without the need for any co-catalyst. The ease of generation of the active species and its recyclability suggest that a new approach to this important class of chemical conversions is possible. Read More

    A mechanism study on the hydrogen evolution reaction catalyzed by molybdenum disulfide complexes.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong, 515063, P. R. China and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
    Density functional theory (DFT) calculations show that H2 evolution is attributed to active sulfur hydrides derived from MoS2 complexes via two- or three-electron reduction from the synthesized [(PY5Me2)MoS2]2+. Water acts as a bridge for H2 evolution from the intermolecular H+/H- coupling between sulfur hydride complexes and hydrated protons. Read More

    Counting DNA molecules with visual segment-based readouts in minutes.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, China. and Faculty of Agricultural and Food Science, Zhejiang A & F University, Hangzhou, 311300, China.
    An ultrafast and extremely simple approach was proposed to count the number of DNA molecules without any microfluidic-based device. By directly counting the number of amplicon clusters in a capillary, the absolute amount of DNA molecules could be easily determined. Read More

    CuWO4 as a photocatalyst for room temperature aerobic benzylamine oxidation.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, USA.
    The aerobic photochemical oxidation of benzylamine was carried out on the ternary oxides CuWO4 and BiVO4 as a test proton-coupled-electron-transfer reaction in acetonitrile. Both oxides give the coupled imine product, N-benzylidenebenzylamine, in near quantitative (98-99%) yield, with rate constants of 0.34 h-1 g-1 and 0. Read More

    Efficient generation of an oxidopyrylium ylide using a Pd catalyst and its [5+2] cycloadditions with several dipolarophiles.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Materials Chemistry, Faculty of Engineering, Shinshu University, Wakasato, Nagano 380-8553, Japan.
    An efficient method for the generation of an oxidopyrylium ylide from 6-acetoxy-6-acetoxymethyl-2H-pyran-3(6H)-one using a Pd catalyst and [5+2] cycloadditions of the resulting ylide are described. Among substituted styrene derivatives as dipolarophiles, electron-rich styrenes showed higher yield (up to 80%). The [5+2] cycloaddition reactions can also be applied to exo-methylene cyclic compounds, and an improved method for the synthesis of polygalolide intermediate has been demonstrated. Read More

    Diverse bimetallic mechanisms emerging from transition metal Lewis acid/base pairs: development of co-catalysis with metal carbenes and metal carbonyl anions.
    Chem Commun (Camb) 2018 Jan 15. Epub 2018 Jan 15.
    Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor St., Chicago, IL 60607, USA.
    The rational development of catalytic reactions involving cooperative behavior between two catalytic reactive sites represents a frontier area of research from which novel reactivity and selectivity patterns emerge. Within this context, this Feature highlights the development of a cooperative system involving transition metal Lewis acid/base pairs. Bimetallic systems consisting of copper carbene Lewis acids and metal carbonyl anion Lewis bases, (NHC)Cu-[MCO], are easily synthesized from readily available organometallic building blocks (NHC = N-heterocyclic carbene; [MCO]- = metal carbonyl anion, e. Read More

    1,4-Additions of tricyclic 1,4-diphosphinines - a novel system to study σ-bond activation and π-π dispersion interactions.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    Institut für Anorganische Chemie, der Rheinischen Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany.
    The dienic nature of the aromatic π-system in 1,4-diphosphinines remains largely unexplored to this day due to a lack of facile and efficient synthetic protocols. Recently reported stable, tricyclic 1,4-diphosphinines were used to explore the thermal reactivity of the π-system towards an array of dienophiles in [4π+2π]- and, for the first time, in [4π+2σ]-type cycloaddition reactions. Read More

    Oxidative radical divergent Si-incorporation: facile access to Si-containing heterocycles.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China. srj0731@
    A copper-catalyzed oxidative radical strategy to avoid the use of the highly expensive noble metal/ligand catalytic systems is described, which allows selective activation of dual chemical bonds around the Si-atom center relying on the nature of alkylsilanes. While for tertiary silanes selective functionalization of Si-H/silyl C(sp3)-H bonds in intermolecular oxidative annulation cascades with N-(2-(ethynyl)aryl)acrylamides toward silino[3,4-c]quinolin-5(3H)-ones, when using secondary silanes and HSi(TMS)3, dual Si-H bonds or Si-H/Si-Si bonds are selectively cleaved leading to 4H-silolo[3,4-c]quinolin-4-ones. Read More

    In situ fluorescence activation of DNA-silver nanoclusters as a label-free and general strategy for cell nucleus imaging.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Biology, Hunan University, Key Laboratory for Bio-Nanotechnology and Molecular Engineering of Hunan Province, Changsha, Hunan 410082, China.
    A facile, general and turn-on nucleus imaging strategy was first developed based on in situ fluorescence activation of C-rich dark silver nanoclusters by G-rich telomeres. After a simple incubation without washing, nanoclusters could selectively stain the nucleus with intense red luminescence, which was confirmed using fixed/living cells and several cell lines. Read More

    Novel ruthenium and iridium complexes of N-substituted carbazole as triplet photosensitisers.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    School of Chemistry, University of Dublin, Trinity College, Dublin 2, Ireland.
    Novel mono- and di-nuclear Ru(ii) and Ir(iii) complexes, bearing a modified carbazole moiety are synthesised. In comparison to their mononuclear analogues, the homonuclear diatomic complexes (RuCRu and IrCIr), in which the carbazole containing-ligand functions as a bridge, display increased absorbance in the visible region, and give rise to higher singlet oxygen quantum yields. Read More

    Polymersomes with asymmetric membranes and self-assembled superstructures using pentablock quintopolymers resolved by electron tomography.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    Department of Applied Physics, Aalto University, FI-00076, Aalto, Espoo, Finland.
    Polystyrene-block-poly(1,4-isoprene)-block-poly(dimethyl siloxane)-block-poly(tert-butyl methacrylate)-block-poly(2-vinyl pyridine), PS-b-PI-b-PDMS-b-PtBMA-b-P2VP, self-assembles in acetone into polymersomes with asymmetric (directional) PI-b-PDMS membranes. The polymersomes, in turn, self-assemble into superstructures. Analogically to supravesicular structures at a smaller length scale, we refer to them as suprapolymersome structures. Read More

    A lithium-ion oxygen battery with a Si anode lithiated in situ by a Li3N-containing cathode.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, People's Republic of China.
    A practicable strategy has been developed to build a LixSi-O2 battery using an in situ formed Li-Si alloy anode based on the decomposition of Li3N pre-loaded in the cathode. The LixSi-O2 battery has achieved more than 100 stable charge-discharge cycles with lower polarization than that using a lithium metal anode. Read More

    In situ development of amorphous Mn-Co-P shell on MnCo2O4 nanowire array for superior oxygen evolution electrocatalysis in alkaline media.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    Center for Micro/Nano Luminescent and Electrochemical Materials, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
    Exploitation of efficient and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is of great importance. Herein, we report that the formation of an amorphous Mn-Co-P shell on MnCo2O4 can boost its OER activity in alkaline media. The core-shell Mn-Co-P@MnCo2O4 nanowire array on Ti mesh (Mn-Co-P@MnCo2O4/Ti) shows excellent electrochemical catalytic activity and requires an overpotential of 269 mV to drive 10 mA cm-2 in 1. Read More

    Alkene functionalization for the stereospecific synthesis of substituted aziridines by visible-light photoredox catalysis.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.
    A novel strategy involving visible-light-induced functionalization of alkenes for the synthesis of substituted aziridines was developed. The readily prepared N-protected 1-aminopyridinium salts were used for the generation of N-centered radicals. This approach allowed the synthesis of aziridines bearing various functional groups with excellent diastereoselectivity under mild conditions. Read More

    A facile one-pot synthesis of acrylated hyaluronic acid.
    Chem Commun (Camb) 2018 Jan 12. Epub 2018 Jan 12.
    Charles Institute of Dermatology, School of Medicine, University College Dublin, Dublin 4, Ireland.
    The synthesis of acrylated hyaluronic acid (HA-A) normally requires 2 to 3 steps of modification, needs laborious purification and also increases the risks of HA degradation. Here, we report that the conjugation of acrylate groups to hyaluronic acid can be successfully achieved via a new facile one-pot approach. Two types of new HA-A hydrogels (via chemical or UV crosslinking) were developed and applied for 3D cell encapsulation. Read More

    Ru(ii) polypyridyl complexes as photocages for bioactive compounds containing nitriles and aromatic heterocycles.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Department of Chemistry, Wayne State University, 5101 Cass Ave, Detroit, Michigan 48202, USA. and Barbara Ann Karmanos Cancer Institute, 4100 John R, Detroit, Michigan 48201, USA.
    Photocaging allows for precise spatiotemporal control over the release of biologically active compounds with light. Most photocaged molecules employ organic photolabile protecting groups; however, biologically active compounds often contain functionalities such as nitriles and aromatic heterocycles that cannot be caged with organic groups. Despite their prevalence, only a few studies have reported successful caging of nitriles and aromatic heterocycles. Read More

    Controlling orthogonal self-assembly through cis-trans isomerization of a non-covalent palladium complex dimer.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
    The trans-configured square-planar complex of dichloropalladium and chiral monodentate phosphine ligands forms self-complementary dimers through 16 hydrogen bonded amides and π-π stacking in chlorinated solvents. The self-assembly is controlled by cis-trans isomerisation of the metal center, where the trans-configuration governs the dimer formation. Read More

    Facile construction of organometallic rotaxane-terminated dendrimers using neutral platinum-acetylides as the main scaffold.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, 3663 N. Zhongshan Road Shanghai, 200062, China.
    We present the successful construction of a new family of organometallic rotaxane-terminated dendrimers using neutral platinum-acetylides as the main scaffold. The fourth generation dendrimer has 24 rotaxane moieties on the surface termini in a monodisperse manner. Read More

    Can 5-methylcytosine analogues with extended alkyl side chains guide DNA methylation?
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Masonic Cancer Center, 2231 6th St SE, Minneapolis, MN 55455, USA.
    5-Methylcytosine (MeC) is an endogenous modification of DNA that plays a crucial role in DNA-protein interactions, chromatin structure, epigenetic regulation, and DNA repair. MeC is produced via enzymatic methylation of the C-5 position of cytosine by DNA-methyltransferases (DNMT) which use S-adenosylmethionine (SAM) as a cofactor. Hemimethylated CG dinucleotides generated as a result of DNA replication are specifically recognized and methylated by maintenance DNA methyltransferase 1 (DNMT1). Read More

    Realization of toroidal magnetic moments in heterometallic 3d-4f metallocycles.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
    Toroidal arrangements of magnetic moments are realized in heterometallic Ln6Cu6 (Ln = Tb and Dy) macrocycles thanks to the magnetic coupling between lanthanide and 3d metal ions. Read More

    Box-like gel capsules from heterostructures based on a core-shell MOF as a template of crystal crosslinking.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Graduate School of Chemical Sciences and Engineering, and Faculty of Science, Hokkaido University, Kita 10, Nishi 8, Kita-ku, Sapporo, 060-0810, Japan.
    New polymer capsules (PCs) were obtained using a crystal crosslinking (CC) method on core-shell MOF crystals. The latter are based on the epitaxial growth of two isostructural coordination polymers which are then selectively crosslinked. Decomposition of the non-reticulated phase leads to new PCs, possessing a well-defined hollow cubic shape reflecting the heterostructure of the template. Read More

    Synergistic effects of stellated fibrous mesoporous silica and synthetic dsRNA analogues for cancer immunotherapy.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Biomedical Research Institute, Department of Life Science and Biotechnology, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
    Stellated fibrous mesoporous silica nanospheres significantly improve the cellular uptake of cancer antigen and the maturation of bone marrow derived dendritic cells in vitro. Moreover, the combination of poly(I:C) with stellated fibrous MS nanospheres markedly decreases the necessary dose of poly(I:C) for anti-tumor immunity, and thus opens new opportunities for the future clinical application of poly(I:C) in cancer immunotherapy. Read More

    Aldehyde-functionalized metal-organic frameworks for selective sensing of homocysteine over Cys, GSH and other natural amino acids.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    School of Chemistry and Materials Science & Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China.
    A novel aldehyde-functionalized porous metal-organic framework (MOF) material has been constructed that can act as the first example of MOF-implicated sensors for discriminating Hcy from natural amino acids and even thiol-related peptides (GSH) with high sensitivity (LOD = 40 nM). The sensing mechanism is also discussed. Read More

    Chemical profiling of two congeneric sea mat corals along the Brazilian coast: adaptive and functional patterns.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP 14040-903, Brazil.
    Metabolomic profiles were explored to understand environmental and taxonomic influences on the metabolism of two congeneric zoanthids, Palythoa caribaeorum and P. variabilis, collected across distinct geographical ranges. Integrated mass spectrometry data suggested the major influence of geographical location on chemical divergence when compared to species differentiation. Read More

    Highly stable lipid-encapsulation of fluorescent nanodiamonds for bioimaging applications.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan. and Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
    Highly stable lipid-encapsulated fluorescent nanodiamonds (FNDs) are produced by photo-crosslinking of diacetylene-containing lipids physically attached to the FND surface. Not only is this coating method simple and fast, but also it gives the FND-lipid hybrids favorable properties for bioapplications. The hybrids are useful as fluorescent biolabels as well as fiducial markers for correlative light and electron microscopy. Read More

    Photocatalytic partial oxidation of limonene to 1,2 limonene oxide.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Istituto per lo Studio dei Materiali Nanostrutturati, CNR, via U. La Malfa 153, 90146 Palermo, Italy.
    The silylation of crystalline TiO2 P25, commonly used for photocatalytic degradation of pollutants, results in an exceptionally selective catalyst for the aerobic limonene epoxidation to 1,2-limonene oxide under solar light irradiation. The hypothesized mechanism involves the singlet oxygen generated through energy transfer from the excited TiO2 to adsorbed O2 molecules. The reaction product is the valued precursor of bio-based poly(limonene carbonate), a thermoplastic polymer of superior thermal and optical properties whose industrial production is in need of an efficient green synthesis of limonene oxide. Read More

    Organic semiconductor perylenetetracarboxylic diimide (PTCDI) electrodes for electrocatalytic reduction of oxygen to hydrogen peroxide.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Laboratory of Organic Electronics, ITN Campus Norrköping, Linköpings Universitet, Bredgatan 34, 60221, Norrköping, Sweden.
    Hydrogen peroxide is one of the most important industrial chemicals and there is great demand for the production of H2O2 using more sustainable and environmentally benign methods. We show electrochemical production of H2O2 by the reduction of O2, enabled by an organic semiconductor catalyst, N,N'-dimethyl perylenetetracarboxylic diimide (PTCDI). We make PTCDI cathodes that are capable of stable and reusable operation in aqueous electrolytes in a pH range of 1-13 with a catalytic figure of merit as high as 26 kg H2O2 per g catalyst per h. Read More

    Effect of lattice strain on the electro-catalytic activity of IrO2 for water splitting.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Processes, School of Resources and Environmental Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China.
    The lattice strain of IrO2 plays a critical role in determining its OER activity. The Ir-O bond length change in IrO6 coordination induces lattice strain. Increasing the annealing temperature results in a stretching strain along the c axis and a compressive strain on the a and b axes, leading to a larger c/a ratio. Read More

    Hidden aryl-exchange processes in stable 16e RhIII [RhCp*Ar2] complexes, and their unexpected transmetalation mechanism.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47071-Valladolid, Spain.
    Experiments mixing the stable 16e 5-coordinate complexes [RhCp*Ar2] (Cp* = C5Me5; Ar = C6F5, C6F3Cl2-3,5) uncover fast aryl transmetalations. Unexpectedly, as supported computationally, these exchanges are not spontaneous, but catalyzed by minute amounts of 18e (μ-OH)2[RhCp*Ar]2 as a source of 16e [RhCp*Ar(OH)]. The OH group is an amazingly efficient bridging partner to diminish the activation barrier of transmetalation. Read More

    Oxidative dehydrogenation reaction of short alkanes on nanostructured carbon catalysts: a computational account.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
    Recent progress from first principles computational studies is presented for catalytic properties of nanostructured carbon catalysts in the oxidative dehydrogenation (ODH) reaction of short alkanes. Firstly, a brief introduction is given on the development of carbon catalysts in ODH since 1970. Oxygen functional groups have pivotal importance for ODH on nanostructured carbon catalysts. Read More

    Extremely low loading of Ru species on hydroxyapatite as an effective heterogeneous catalyst for olefin epoxidation.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Beijing National Laboratory for Molecular Sciences Laboratory of Molecular Nanostructures and Nanotechnology CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100049, China.
    We report a new class promising heterogeneous catalyst for olefin epoxidation based on 0.05 wt% Ru species supported on hydroxyapatite, which was prepared through a simple cation-exchange process between RuCl3·nH2O and hydroxyapatite. The new catalyst showed high activity, excellent selectivity and good recyclability for various olefins in the presence of molecular oxygen and iso-butyraldehyde as co-oxidants. Read More

    Quinoline-para-quinones and metals: coordination-assisted formation of quinoline-ortho-quinones.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    School of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
    The reaction of the para-quinone 6,7-dichloroquinoline-5,8-dione with various transition metal dimers led to the unexpected formation of quinoline-ortho-quinone metal complexes. Systematic variation of the reaction conditions helped identify the solvent as the source of the carbonyl oxygen. Read More

    Facile three-step synthesis and photophysical properties of [8]-, [9]-, and [12]cyclo-1,4-naphthalene nanorings via platinum-mediated reductive elimination.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Hefei National Laboratory of Physical Science at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China (USTC), 96 Jinzhai Road, Hefei, Anhui Province 230026, P. R. China.
    Herein we report a facile three-step synthesis of [8]-, [9]-, and [12]cyclo-1,4-naphthalene nanorings as the conjugated segments of carbon nanotubes. The nanorings were created via a platinum-mediated assembly of 1,4-naphthalene-based units and subsequent reductive elimination in the presence of triphenylphosphine. This present platinum-mediated approach is attractive because of its simple three-step process to produce the targeted nanorings in a high overall yield. Read More

    New approaches to the lithiation kinetics in reaction-limited battery electrodes through electrochemical impedance spectroscopy.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    Institute of Advanced Materials (INAM), Universitat Jaume I, ES-12006 Castelló, Spain.
    Electrochemical impedance spectroscopy is a widely employed technique probing kinetic limitations in the charging of battery electrodes. Hindrance mechanisms locate at the interfaces between the active material and the electrolyte, and in the bulk of the reacting compound. Rate-limiting mechanisms are viewed as resistive circuit elements and can be extracted using standard impedance analyzers. Read More

    Dehydrogenation of dimethylamine-borane mediated by Group 1 pincer complexes.
    Chem Commun (Camb) 2018 Jan 11. Epub 2018 Jan 11.
    School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
    Group 1 salts containing carbazolido NNN pincer ligands are precatalysts for the dehydrogenation of Me2NH·BH3. NMR monitoring and DOSY studies show a heavy dependence on the metal and solvent, allowing in some cases selective formation of dehydrogenation products consistent with hydrogen liberation. Read More

    3-D and electrically conducting functional skin mapping for biomedical applications.
    Chem Commun (Camb) 2018 Jan 10. Epub 2018 Jan 10.
    School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore. and Nanyang Environment and Water Research Institute, Residues and Resource Reclamation Center, 1 Cleantech Loop, CleanTech, Singapore 637141, Singapore.
    Ex situ and in situ 3-D and electrically conducting mapping of the skin topography via electropolymerization of a conducting polymer on a previously sampled skin stamp or directly on the skin of a live human subject were performed here with the intention to be further used in biomedical applications. Read More

    Multiply "trapped" 3[trans-Pt(PR3)2(C[triple bond, length as m-dash]CC6H4X)2]* conformers in rigid media.
    Chem Commun (Camb) 2018 Jan 10. Epub 2018 Jan 10.
    Departement de chimie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada.
    The complexes (R = Me, Et, Bu; X = H, SMe) exhibit well-defined multi-exponential emissions (2-4 components) in the solid state at 77 and 298 K and in 2MeTHF glasses at 77 K due to multiple frozen conformers exhibiting variable dihedral angles formed by the PtP2C2 and C6H4 planes. The demonstration was made using X-ray crystallography at various temperatures where different sites are present in the samples, and using geometry optimization (DFT computations) where various stable conformers are noted. Read More

    Synthesis of functionalized helical BN-benzo[c]phenanthrenes.
    Chem Commun (Camb) 2018 Jan 10. Epub 2018 Jan 10.
    Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR), Universidad de Alcalá, 28805-Alcalá de Henares, Madrid, Spain.
    A novel parent BN-benzo[c]phenanthrene, with helical chirality and remarkable structural features, has been easily obtained in three steps with a global yield of 55%. Moreover, Cl-substituted derivatives have been prepared and these have served as useful starting materials for the development of palladium-catalyzed cross-coupling reactions. Read More

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