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    Real-time monitoring of the dissolution kinetics of silver nanoparticles and nanowires in aquatic environments using an aggregation-induced emission fluorogen.
    Chem Commun (Camb) 2018 Apr 18. Epub 2018 Apr 18.
    Department of Ocean Science, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, China and Marine Environmental Laboratory, HKUST Shenzhen Research Institute, Shenzhen 518057, China.
    We employed a fluorogenic Ag+ sensor, tetrazole-functionalized tetraphenylethylene derivative 1 (TEZ-TPE-1), to investigate the dissolution kinetics of AgNPs and AgNWs in aquatic environments. Real-time and quantitative monitoring of Ag+ release was achieved by using the proposed method, which agreed well with the conventional ICP-MS detection method. Read More

    Correction: Copper-mediated regioselective C-H etherification of naphthylamides with arylboronic acids using water as an oxygen source.
    Chem Commun (Camb) 2018 Apr 18. Epub 2018 Apr 18.
    Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India.
    Correction for 'Copper-mediated regioselective C-H etherification of naphthylamides with arylboronic acids using water as an oxygen source' by Subhasish Roy et al., Chem. Commun. Read More

    Catalytic asymmetric trifluoromethylthiolation of carbonyl compounds via a diastereo and enantioselective Cu-catalyzed tandem reaction.
    Chem Commun (Camb) 2018 Apr 18. Epub 2018 Apr 18.
    Department of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China.
    Although recent progress has been made in introducing an SCF3 functionality into a variety of molecules, enantioselective trifluoromethylthiolation remains challenging, especially the α-trifluoromethylthiolation of carbonyl compounds. The present study describes a diastereo and enantioselective Cu-catalyzed tandem 1,4-addition/trifluoromethylthiolation of acyclic enones. The tandem reaction enables the asymmetric integration of the -SCF3 group to carbonyl compounds, establishing chiral tertiary α-carbon centers and affording α-SCF3-β-substituted carbonyl compounds in 50-92% yields with up to 20 : 1 dr and 96% ee. Read More

    A selective glucose sensor: the cooperative effect of monoboronic acid-modified poly(amidoamine) dendrimers.
    Chem Commun (Camb) 2018 Apr 18. Epub 2018 Apr 18.
    Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan and Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 807, Taiwan and Department of Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
    Selective glucose binding was identified through five generations of monoboronic acid-functionalized PAMAM dendrimers. The best selectivity obtained when using G3 dendrimers (1b) generated 71.1, 94. Read More

    Heparin-induced tau filaments are structurally heterogeneous and differ from Alzheimer's disease filaments.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Department of chemistry, University of California Santa Babara, Santa Barbara, California 93106, USA.
    Alzheimer's disease (AD) is characterized by the presence of tau filaments in the brain whose structure was recently solved. The formation of AD filaments is routinely modeled in vitro by mixing tau with heparin. This study shows that heparin-induced tau filaments are markedly different from the AD filaments and are highly heterogeneous. Read More

    Negishi coupling reactions with [C]CHI: a versatile method for efficient C-C bond formation.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Radiochemistry and Nuclear Imaging, CIC biomaGUNE, Paseo Miramón 182, 20014 San Sebastián, Guipúzcoa, Spain.
    Herein, we present a fast, efficient and general one-pot method for the synthesis of 11C-labelled compounds via the Negishi cross-coupling reaction. Our approach, based on the in situ formation of [11C]CH3ZnI and subsequent reaction with aryl halides or triflates, has proven efficient to synthesize [11C]thymidine, a biologically relevant compound with potential applications as a proliferation marker. Theoretical calculations have shown irreversible formation of a tetracoordinated nucleophilic 11C-Zn(ii) reagent and electronic requirements for an efficient Negishi coupling. Read More

    Anti-Stokes fluorescence microscopy using direct and indirect dark state formation.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
    Measurements on biological samples are often hampered by auto-fluorescence from inherent compounds in tissue or cells, limiting the achievable contrast. Both the signal of interest and the auto-fluorescence are usually detected on the Stokes side of the excitation laser. In this communication, we present two new microscopy modalities, based on the emission of a red-emitting DNA-stabilized silver nanocluster (DNA-AgNC). Read More

    Metabolite amyloid-like fibrils interact with model membranes.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel. and Department of Materials Science and Engineering, Iby and Aladar Fleischman Faculty of Engineering, Tel Aviv University, Tel Aviv 6997801, Israel and BLAVATNIK CENTER for Drug Discovery, Tel Aviv University, Tel Aviv 6997801, Israel.
    Amyloid-like structure formation by various metabolites represents a significant extension of the amyloidogenic building block family. Similar to protein amyloids, metabolite amyloids induce apoptotic toxicity, a process that was linked to membrane association. Here, we demonstrate that metabolite amyloids interact with model membranes and study the mechanism by molecular dynamics. Read More

    Electrochemical amphotericity and NIR absorption induced via the step-wise protonation of fused quinoxaline-tetrathiafulvalene-pyrroles.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Department of Chemistry, The University of Texas at Austin, 105 East 24th Street-Stop A5300, Austin, Texas 78712-1224, USA.
    We describe an effective approach to producing electrochemical amphoteric character and tuning optical properties. Reversible step-wise protonation of quinoxaline annulated TTF-pyrrole derivatives promotes intramolecular electron-transfer and leads to formation of stable, fully charge-separated diradical states. This allows for the creation of low bandgap systems and NIR optical properties. Read More

    Alkali-induced crumpling of TiCT (MXene) to form 3D porous networks for sodium ion storage.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA.
    We present a novel strategy for constructing three-dimensional (3D) porous Ti3C2Tx (MXene) networks by alkali-induced crumpling of Ti3C2Tx nanosheets. The 3D porous Ti3C2Tx networks display high capacity and outstanding rate performance as anode materials for sodium-ion batteries. Read More

    Light-fuelled reversible expansion of spiropyran-based vesicles in water.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Molecular Nanofabrication Group, MESA+ Institute for Nanotechnology, University of Twente, PO Box 207, 7500 AE Enschede, The Netherlands.
    We present the design and synthesis of spiropyran-based dynamic vesicles, for which the building block is the amphiphilic merocyanine isomer. Under irradiation with visible light, the photo-conversion of the protonated and charged merocyanine to the neutral spiropyran form leads to the transient and reversible expansion of these vesicles. Read More

    Photophysical characterization of a highly luminescent divalent-europium-containing azacryptate.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA.
    We report a new luminescent EuII-containing complex. The complex is excited with visible light, leading to emission centered at 447 nm with a lifetime of 1.25 μs. Read More

    Polyvinyl alcohol-boronate gel for sodium hydroxide extraction.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Department of Chemistry, The University of Texas at Austin, 105 E. 24th Street Stop A5300, Austin, Texas 78712-1224, USA.
    Gels formed from commercially available polyvinyl alcohol (PVA) and 1,4-benzene diboronic acid (BdBA) in DMSO absorb NaOH efficiently from a bulk aqueous solution decreasing its pH. Read More

    A supramolecular assembly enables discrimination between metalloproteins and non-metalloproteins.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India. and Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India.
    Discriminating proteins using simple methods is a highly ambitious task. Herein, we provide the first report of a cyclodextrin based supramolecular host-guest assembly, which without involving any specially designed receptor and transducer, yields a distinct fluorescence response i.e. Read More

    The recognition of glycans by protein receptors. Insights from NMR spectroscopy.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain. and Ikerbasque, Basque Foundation for Chemistry, María Díaz de Haro, 3, 48013 Bilbao, Bizkaia, Spain and Department Organic Chemistry II, Faculty of Science & Technology, University of the Basque Country, 48940 Leioa, Bizkaia, Spain.
    Carbohydrates (glycans, saccharides, sugars) are everywhere. In fact, glycan-protein interactions are involved in many essential processes of life and disease. The understanding of the key structural details at the atomic and molecular level is of paramount importance to effectively design molecules for therapeutic purposes. Read More

    A novel spiro-annulated benzimidazole host for highly efficient blue phosphorescent organic light-emitting devices.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China.
    A novel host material featuring a spiro-annulated benzimidazole configuration is exploited for blue phosphorescent organic light-emitting devices (PhOLEDs). The new material exhibits a high triplet energy (3.07 eV) and a bipolar characteristic and is effective as the host for FIrpic-, FIr6- and FK306-based blue PhOLEDs with high performances. Read More

    Carbon dioxide bubble-propelled microengines in carbonated water and beverages.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Department of Materials Science, Fudan University, 220 Handan Rd, Shanghai, P. R. China.
    We demonstrate a new type of gaseous fuel for rolled-up tubular Ti/Cr microengine powered by carbon dioxide microbubbles in carbonated water and brewed beverages. Existence of microbubble pockets is revealed using on-chip integrated transparent microtubes. Vertical position, angle of rotation and buoyancy of ferromagnetic Ti/Fe/Cr microengines are controlled using an external magnetic field. Read More

    Size-dependent uptake of electrically neutral amphipathic polymeric nanoparticles by cell-sized liposomes and an insight into their internalization mechanism in living cells.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Graduate School of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan. and Medical Device Fabrication Engineering Center, Graduate School of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan.
    Size-dependent uptake behaviors of electrically neutral amphipathic polymeric nanoparticles in cell-sized liposomes and living cells were investigated. Kinetic analyses and the particle size distribution suggested a size-dependent penetration mechanism (size threshold: 3.1 nm). Read More

    Self-templated synthesis of heavily nitrogen-doped hollow carbon spheres.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China. and Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
    Nitrogen-doped hollow carbon spheres with a well-defined shape, uniform diameter, and high doping concentration (11 at%) are synthesized via space-confined thermal decomposition of a single source precursor zinc carbodiimide, which can serve as both carbon and nitrogen sources and also a self-template. Read More

    Gene assembly via one-pot chemical ligation of DNA promoted by DNA nanostructures.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Metabion GmbH, Semmelweisstrasse 3, 82152 Planegg Munich, Germany.
    Current gene synthesis methods are driven by enzymatic reactions. Here we report the one-pot synthesis of a chemically-ligated gene from 14 oligonucleotides. The chemical ligation benefits from the highly efficient click chemistry approach templated by DNA nanostructures, and produces modified DNA that is compatible with polymerase enzymes. Read More

    Competition of cation-π and exo-wall π-π interactions: a novel approach to achieve ultrasensitive response.
    Chem Commun (Camb) 2018 Apr 17. Epub 2018 Apr 17.
    Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, P. R. China.
    A novel approach to achieve ultrasensitive response was successfully developed by rationally introducing the competition between cation-π and exo-wall π-π interactions into a pillar[5]arene-based supramolecular organogel (P5N-OG). Interestingly, the P5N-OG could be used for ion detection and separation, fluorescent display materials as well as ultrasensitive logic gates. Read More

    Exfoliation of ultrathin FePS layers as a promising electrocatalyst for the oxygen evolution reaction.
    Chem Commun (Camb) 2018 Apr 16. Epub 2018 Apr 16.
    National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230029, China.
    Few-layer ternary FePS3 nanosheets, prepared via chemical vapor transport synthesis and ball-milling exfoliation, exhibit excellent electrocatalytic performance for the oxygen evolution reaction in an alkaline medium. Combined with first principles calculations, our X-ray spectroscopy and HRTEM results clearly reveal that the introduction of in-plane defects in FePS3 layers after exfoliation and formation of a FePS3-FeOOH heterostructure during the OER process largely contribute to the catalytic activity enhancement. Read More

    A solution NMR toolset to probe the molecular mechanisms of amyloid inhibitors.
    Chem Commun (Camb) 2018 Apr 16. Epub 2018 Apr 16.
    Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada. and Department of Chemistry and Chemical Biology, McMaster University, Hamilton, Ontario, Canada.
    The self-association of the amyloid beta (Aβ) peptide into toxic oligomers is implicated in the early events leading to Alzheimer's disease (AD). Blocking the formation of Aβ oligomers and their interactions with the extracellular and cellular environment through small molecules and biopharmaceuticals is therefore a promising preventive strategy for AD. However, given the heterogeneity and transient nature of the Aβ oligomeric species, detailed structural and kinetic characterizations of such oligomers and oligomer:inhibitor complexes have proven to be challenging. Read More

    A giant 90-nucleus silver cluster templated by hetero-anions.
    Chem Commun (Camb) 2018 Apr 16. Epub 2018 Apr 16.
    State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People's Republic of China.
    A 90-nucleus silver cluster (SD/Ag38) cocapped by tBuC6H4S- and PhCOO- ligands was synthesized using hetero-anion template method. Single-crystal X-ray diffraction (SCXRD) revealed a 90-nucleus metallic dumbbell-like core constructed by two large W5O19@Ag38 heads sandwiching one slender (SO4)2@Ag14 waist. Both W5O198- and SO42- templates were in situ generated and synergistically induced the formation of the largest known anion-templated silver cluster. Read More

    1-Bromoethene-1-sulfonyl fluoride (1-Br-ESF), a new SuFEx clickable reagent, and its application for regioselective construction of 5-sulfonylfluoro isoxazoles.
    Chem Commun (Camb) 2018 Apr 16. Epub 2018 Apr 16.
    School of Chemistry, Chemical Engineering and Life Science, and State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology, 205 Luoshi Road, Wuhan, Hubei Province 430070, P. R. China.
    A new fluorosulfonylation reagent 1-bromoethene-1-sulfonyl fluoride was developed (1-Br-ESF). This unique reagent possesses three addressable handles (vinyl, bromide, and sulfonyl fluoride) and has great potential to function as a tris-electrophile and as a sulfur(vi) fluoride exchange (SuFEx) clickable material to enrich the SuFEx tool cabinet. The application of this reagent for regioselective synthesis of 5-sulfonylfluoro isoxazoles has been realized through a [3+2] cycloaddition with N-hydroxybenzimidoyl chlorides. Read More

    Metallophthalocyanine-based redox active metal-organic conjugated microporous polymers for OER catalysis.
    Chem Commun (Camb) 2018 Apr 16. Epub 2018 Apr 16.
    Molecular Materials Laboratory, Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore-560064, India.
    We report the design and synthesis of two Co2+ and Zn2+ phthalocyanine (PC)-based redox active metal-organic conjugated microporous polymers (MO-CMP), CoCMP and ZnCMP, respectively, obtained by a Schiff base condensation reaction. CoCMP, where Co2+ is stabilized by N4-coordination of PC, has shown stable and efficient electrocatalytic activity towards the OER with a low overpotential of 340 mV. Read More

    An alkaline-resistant Ag(i)-anchored pyrazolate-based metal-organic framework for chemical fixation of CO.
    Chem Commun (Camb) 2018 Apr 16. Epub 2018 Apr 16.
    Shanghai Key Laboratory of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, P. R. China.
    An alkaline-resistant Ag(i)-anchored metal-organic framework has been achieved via postsynthetic modification of pyrazolate-based linkers. For the first time, the resultant MOF was completely heterogeneous and recyclable over at least ten cycles in cyclic carboxylation of propargyl amines and CO2 into oxazolidinones and tetramic acids under atmospheric pressure of CO2. Read More

    Combining photoredox and silver catalysis for azidotrifluoromethoxylation of styrenes.
    Chem Commun (Camb) 2018 Apr 16. Epub 2018 Apr 16.
    State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China. and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
    The first example of an azidotrifluoromethoxylation of styrenes has been achieved by synergistic visible-light-mediated photoredox and silver catalysis. Trifluoromethyl arylsulfonate (TFMS) and the Zhdankin reagent were used as the trifluoromethoxylation reagent and the azide source, respectively. A good functional group tolerance and mild reaction conditions of this method are applicable to late-stage azidotrifluoromethoxylation of complex small molecules. Read More

    Investigation of VO as a low-cost rechargeable aqueous zinc ion battery cathode.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    School of Materials Science and Engineering, Central South University, Changsha 410083, P. R. China. and Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, Hunan, China.
    Rechargeable aqueous zinc ion batteries (ZIBs) are highly desirable for large-scale energy storage due to their advantages of safety and low-cost. Development of advanced cathodes for use in aqueous ZIBs is urgently needed. Herein, we report a low-cost rechargeable aqueous Zn-V2O5 cell with 3 M ZnSO4 electrolyte that demonstrates high zinc storage capability. Read More

    Genetic encoding of 2-aryl-5-carboxytetrazole-based protein photo-cross-linkers.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, USA.
    Three γ-heteroatom-substituted N-methylpyrroletetrazole-lysines (mPyTXKs) were synthesized and subsequently incorporated into proteins site-specifically via genetic code expansion. The γ-seleno-substituted derivative, mPyTSeK, showed excellent incorporation efficiency in Escherichia coli and allowed site-selective photo-cross-linking of the GST dimer. Furthermore, the mPyTSeK-cross-linked GST dimer can be cleaved under mild oxidative conditions. Read More

    A highly concentrated phosphate-based electrolyte for high-safety rechargeable lithium batteries.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    School of Materials Science and Engineering, Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, Hefei University of Technology, Hefei, 230009, China.
    We prepare a totally nonflammable phosphate-based electrolyte composed of 5 mol L-1 (M) Li bis(fluorosulfonyl) imide (LiFSI) in a trimethyl phosphate (TMP) solvent. The concentrated 5 M LiFSI/TMP electrolyte shows good compatibility with graphite and no Al corrosion. More attractively, such a concentrated electrolyte can effectively suppress the growth of Li dendrites in Li metal batteries because of a stable LiF-rich SEI layer. Read More

    Redox deracemization of 1,3,4,9-tetrahydropyrano[3,4-b]indoles.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China and School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
    The existing asymmetric synthesis of enantiopure α-substituted cyclic ethers predominantly relies on the enantioselective C-C bond formation involving a prochiral oxocarbenium ion intermediate. In such a strategy, enantioselectivity and efficiency are typically susceptible to the electronic and substituent effects of either nucleophile or electrophile partners. Here, we describe a strategically different redox deracemization of α-substituted 1,3,4,9-tetrahydropyrano[3,4-b]indoles. Read More

    Conformational control over an aldehyde fragment by selective vibrational excitation of interchangeable remote antennas.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    CQC, Department of Chemistry, University of Coimbra, 3004-535, Coimbra, Portugal.
    We apply interchangeable vibrational antennas (OH or NH2 group) to achieve unprecedented conformational control over the heavy aldehyde fragment in 2-formyl-2H-azirine. The two aldehyde conformers were manipulated bi-directionally, using selective vibrational excitation with narrowband near-infrared (NIR) light tuned at the wavenumbers corresponding to OH and NH2 stretching overtones and combination modes. Read More

    Highly effective electrosynthesis of hydrogen peroxide from oxygen on a redox-active cationic covalent triazine network.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China. and School of Physical Science of Technology, ShanghaiTech University, Shanghai 201210, China.
    Direct electrosynthesis of hydrogen peroxide (H2O2) by oxygen reduction is a green and safe strategy to replace the traditional anthraquinone process. Herein, we have designed a two-dimensional redox-active cationic covalent triazine network to be used directly as a cost-effective metal-free electrocatalyst for the oxygen reduction reaction (ORR) to form H2O2. Such a dicationic 2D polymer possesses a porous structure with pore diameters of 2-10 nm and a total N content of 13. Read More

    Oxygen-reduction catalysis of N-doped carbons prepared via heat treatment of polyaniline at over 1100 °C.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    Departamento de Química Inorgánica and Instituto de Materiales, Universidad de Alicante, Spain.
    Advanced catalysts for the oxygen reduction reaction based on N-doped carbon materials have been designed via pyrolysis of polyaniline at temperatures above 1100 °C. The detailed characterization and computational calculations suggest that the conversion from pyridine to quaternary N in the edge position at high temperatures is responsible for the outstanding activity. Read More

    The mechanochemical Scholl reaction - a solvent-free and versatile graphitization tool.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    Professur für Anorganische Chemie I, TU Dresden, Bergstraße 66, D-01069 Dresden, Germany.
    Herein, we report on the mechanochemical Scholl reaction of dendritic oligophenylene precursors to produce benchmark nanographenes such as hexa-peri-hexabenzocoronene (HBC), triangular shaped C60 and expanded C222 under solvent-free conditions. The solvent-free approach overcomes the bottleneck of solubility limitation in this well-known and powerful reaction. The mechanochemical approach allows tracking the reaction process by in situ pressure measurements. Read More

    Palladium-catalyzed aerobic regio- and stereo-selective olefination reactions of phenols and acrylates via direct dehydrogenative C(sp)-O cross-coupling.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    Key Laboratory of Applied Chemistry of Chongqing Municipality, Institute of Bioorganic & Medicinal Chemistry, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China. and Beijing National Laboratory for Molecular Sciences, Beijing 100190, China.
    An efficient olefination protocol for the oxidative dehydrogenation of phenols and acrylates has been achieved using a palladium catalyst and O2 as the sole oxidant. This reaction exhibits high regio- and stereo-selectivity (E-isomers) with moderate to excellent isolated yields and a wide substrate scope (32 examples) including ethyl vinyl ketone and endofolliculina. Read More

    A full color photonic polymer, rewritable with a liquid crystal ink.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    Stimuli-responsive Functional Materials and Devices, and Institute for Complex Molecular Systems, Eindhoven University of Technology, P. O. Box 513, 5600 MB, Eindhoven, The Netherlands. and SCNU-TUE Joint Laboratory of Device Integrated Responsive Materials (DIRM), South China Normal University, Guangzhou Higher Education Mega Center, 510006, Guangzhou, China.
    A printable and rewritable photonic polymer coating has been fabricated from a cholesteric liquid crystal. Full color images can be patterned in polymer coatings by using a liquid crystal ink. The printed patterns can be erased and rewritten multiple times, making these coatings interesting as rewritable papers. Read More

    Superprotonic conduction through one-dimensional ordered alkali metal ion chains in a lanthanide-organic framework.
    Chem Commun (Camb) 2018 Apr 13. Epub 2018 Apr 13.
    State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, China.
    Although no evident hydrogen-bond network appears, an ultrahigh proton conductivity of 2.91 × 10-2 S cm-1 at 363 K and 90% RH with an ultralow activation energy of 0.10 eV was observed in an anionic lanthanide-organic framework Na2[Eu(SDB)2(COO)]·0. Read More

    Trisubstituted olefin synthesis via Ni-catalyzed hydroalkylation of internal alkynes with non-activated alkyl halides.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    School of Materials and Chemical Engineering, ChuZhou University, Chuzhou, 239000, China.
    The stereoselective synthesis of tri-substituted alkenes is challenging. Herein, we report a Ni-catalyzed regio- and stereo-selective hydroalkylation of internal alkynes with non-activated alkyl halides. This method does not use any sensitive organometallic reagents and shows good functional group compatibility, which enables the efficient synthesis of many tri-substituted olefins from readily available coupling partners. Read More

    Significant effects of counteranions on the anticancer activity of iridium(iii) complexes.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    Institute of Anticancer Agents Development and Theranostic Application, The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Department of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China.
    The rational design of the ligands around transition metals has achieved success in the development of anticancer complexes. In this contribution, a series of organometallic half-sandwich iridium(iii) complexes with various corresponding counteranions have been prepared and characterized. The size and coordination ability of the counteranions exert a great influence on the chemical reactivity and anticancer activity of these complexes. Read More

    Driving dimethyl carbonate synthesis from CO and methanol and production of acetylene simultaneously using CaC.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
    The synthesis of dimethyl carbonate (DMC) from CO2 and methanol is a very interesting reaction, but is thermodynamically limited. In this work, CaC2 was used to consume the water produced in the reaction to shift the reaction equilibrium, and C2H2 was produced at the same time. This is the first work on the combination of driving a thermodynamically unfavorable reaction and producing C2H2 using CaC2. Read More

    Cysteine-reactive probes and their use in chemical proteomics.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    Department of Chemistry, The Scripps Research Institute, 130 Scripps Way, Jupiter, FL 33458, USA.
    Proteomic profiling using bioorthogonal chemical probes that selectively react with certain amino acids is now a widely used method in life sciences to investigate enzymatic activities, study posttranslational modifications and discover novel covalent inhibitors. Over the past two decades, researchers have developed selective probes for several different amino acids, including lysine, serine, cysteine, threonine, tyrosine, aspartate and glutamate. Among these amino acids, cysteines are particularly interesting due to their highly diverse and complex biochemical role in our cells. Read More

    Evidence for anion-binding of all-cis hexafluorocyclohexane in solution and solid state.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    Institute of Organic Chemistry and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, Ulm 89081, Germany.
    We report a solution NMR and X-ray crystallographic study on the anion affinity of all-cis 1,2,3,4,5,6-hexafluorocyclohexane, which has only recently become synthetically accessible. Our results suggest that the interaction exhibits preferential 1 : 1 stoichiometry, while its strength is only moderate (e.g. Read More

    Coordination chemistry within a protein host: regulation of the secondary coordination sphere.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    Department of Chemistry, 1102 Natural Science II, University of California, Irvine, CA 92697, USA.
    Secondary coordination spheres of metal complexes are instrumental in controlling properties that are linked to function. To study these effects in aqueous solutions artificial Cu proteins have been developed using biotin-streptavidin (Sav) technology and their binding of external azide ions investigated. Parallel binding studies were done in crystallo on single crystals of the artificial Cu proteins. Read More

    Regulation of both the structure and function by a de novo designed disulfide bond: a case study of heme proteins in myoglobin.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China. and Laboratory of Protein Structure and Function, University of South China, Hengyang 421001, China.
    A de novo designed intramolecular disulfide bond in myoglobin, resembling that in cytoglobin without structural evidence, was confirmed by an X-ray structure for the first time and was demonstrated to regulate both the structure and function of this protein, which fulfills the design of an artificial dehaloperoxidase, with an activity exceeding that of a native enzyme. Read More

    Silicon quantum dots with heavily boron and phosphorus codoped shell.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    Department of Electrical and Electronic Engineering, Graduate School of Engineering, Kobe University, Rokkodai, Nada, Kobe 657-8501, Japan.
    Heavily boron and phosphorus codoped silicon quantum dots (QDs) are dispersible in water without organic ligands and exhibit near infrared luminescence. We summarize the fundamental properties and demonstrate the formation of a variety of nanocomposites. Read More

    Pd-catalyzed defluorination/arylation of α-trifluoromethyl ketones via consecutive β-F elimination and C-F bond activation.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    School of Biology and Medical Engineering, Key Laboratory of Advanced Functional Materials and Devices of Anhui Province Hefei University of Technology Hefei, 230009, P. R. China.
    An unprecedented Pd-catalyzed activation of a CF3 group is reported herein. The key to the success of this reaction is the combination of consecutive β-F elimination and C-F bond oxidative addition of a trifluoromethyl group. It also represents the first general application of α-trifluoromethyl ketones as building blocks by C-F bond activation. Read More

    FePO as an anode material to obtain high-performance sodium-based dual-ion batteries.
    Chem Commun (Camb) 2018 Apr 12. Epub 2018 Apr 12.
    State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences 5625 Renmin Street, Changchun 130022, China.
    Herein, the FePO4 material was for the first time proposed to serve as an anode electrode, as an intercalation sodium host, to obtain novel sodium-based dual-ion batteries. And the full cell can present a highly reversible capacity of 120 mA h g-1 in the range of 2-4.2 V and exhibits an excellent initial coulombic efficiency of 99. Read More

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