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A lead-free perovskite-like hybrid with above-room-temperature switching of quadratic nonlinear optical properties.
We report a new lead-free perovskite-like hybrid, composed of hexamethyleneimine and one-dimensional [SbCl5]n2- polyanionic zigzag chains, which shows above-room-temperature switching of quadratic nonlinear optical (NLO) properties induced by the unique order-disorder conformational changes of the organic cation. PMID: 29770371 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Zhang J, Han S, Liu X, Wu Z, Ji C, Sun Z, Luo J Tags: Chem Commun (Camb) Source Type: research

Rh-Catalyzed C-H bond alkylation of indoles with α,α-difluorovinyl tosylate via indolyl group migration.
Rh-Catalyzed C-H bond alkylation of indoles with α,α-difluorovinyl tosylate via indolyl group migration. Chem Commun (Camb). 2018 May 17;: Authors: Zhou L, Zhu C, Loh TP, Feng C Abstract Herein we demonstrate that an alkylation of indoles could be accessed through C-H bond functionalization with α,α-difluorovinyl tosylate. The key aspect for the effective alkylation is the influence of the fluorine substituents on the reactivity of the C[double bond, length as m-dash]C double bond, allowing regioselective insertion as well as an indolyl group shift process. Furthermore, the flu...
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Zhou L, Zhu C, Loh TP, Feng C Tags: Chem Commun (Camb) Source Type: research

Catalytic asymmetric synthesis of spirooxindoles: recent developments.
This article is divided into sections according to the size and type of the generated spiro-ring fused at the C3-position of the oxindole core (from three-membered to seven-membered spiro-rings), and representative examples are given with illustrations. In addition, the enantioselective construction of bispirooxindole frameworks is also discussed in the last section. PMID: 29770377 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Mei GJ, Shi F Tags: Chem Commun (Camb) Source Type: research

The limits to biocatalysis: pushing the envelope.
Abstract In the period 1985 to 1995 applications of biocatalysis, driven by the need for more sustainable manufacture of chemicals and catalytic, (enantio)selective methods for the synthesis of pharmaceutical intermediates, largely involved the available hydrolases. This was followed, in the next two decades, by revolutionary developments in protein engineering and directed evolution for the optimisation of enzyme function and performance that totally changed the biocatalysis landscape. In the same period, metabolic engineering and synthetic biology revolutionised the use of whole cell biocatalysis in the synthesi...
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Sheldon RA, Brady D Tags: Chem Commun (Camb) Source Type: research

IrIII/NiII-Metallaphotoredox catalysis: the oxidation state modulation mechanism versus the radical mechanism.
Abstract A novel oxidation state modulation mechanism, merging oxidative quenching (IrIII-*IrIII-IrIV-IrIII) and nickel catalytic (NiII-NiI-NiIII-NiI-NiII) cycles, has been illuminated unambiguously for photoredox-mediated iridium(iii)/nickel(ii) dual catalyzed C-O cross-coupling of aryl bromide and alcohol. Quinuclidine participates in a crucial proton-coupled electron transfer process to accelerate the reaction and regulate C-O coupling selectivity. PMID: 29770395 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Zhu B, Yan LK, Geng Y, Ren H, Guan W, Su ZM Tags: Chem Commun (Camb) Source Type: research

Enantioselective nickel-catalyzed arylative intramolecular 1,4-allylations.
Abstract The enantioselective nickel-catalyzed desymmetrization of allenyl cyclohexa-2,5-dienones by reaction with arylboronic acids is described. Nickel-catalyzed arylation of the allene gives allylnickel species, which undergo cyclization by 1,4-allylation to produce hexahydroindol-5-ones and hexahydrobenzofuran-5-ones with three contiguous stereocenters in high diastereo- and enantioselectivities. PMID: 29770399 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Nguyen TLN, Incerti-Pradillos CA, Lewis W, Lam HW Tags: Chem Commun (Camb) Source Type: research

Towards the rational design of novel charge-transfer materials: biaryls with a dihedral angle-independent hole delocalization mechanism.
Abstract Biaryl cation radicals are important electroactive materials, which show two mechanisms of hole delocalization: static delocalization at small interplanar dihedral angles and dynamic hopping at larger angles, reflecting the interplay between electronic coupling and structural reorganization. Herein, we describe the rational design of biaryls possessing an invariant hole delocalization mechanism. PMID: 29770400 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Ivanova LV, Navale TS, Wang D, Lindeman S, Ivanov MV, Rathore R Tags: Chem Commun (Camb) Source Type: research

Synthesis of tetronic acids from propargylic alcohols and CO2.
Abstract A direct and practical synthesis of important tetronic acids from easily available propargylic alcohols and carbon dioxide is reported for the first time. This transition-metal-free transformation features high atom- and step-economy, mild reaction conditions, good functional group tolerance and high yield. Preliminary mechanistic studies suggest that the reaction proceeds via cyclization to give alkylidene cyclic carbonate, ring-opening and re-cyclization processes. PMID: 29770416 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Shen G, Zhou WJ, Zhang XB, Cao GM, Zhang Z, Ye JH, Liao LL, Li J, Yu DG Tags: Chem Commun (Camb) Source Type: research

EU-7 zeolite: a synthetic BIK type zeolite with high hydrothermal stability.
JA Abstract EU-7 zeolite with Si/Al ratio of 15 is identified as a BIK type zeolite. The framework charge is compensated with Cs+ cations located in 8-ring channels at regular distances. Even partially exchanged, Cu-loaded EU-7 is active in NH3-SCR and withstands hydrothermal aging at 900 °C needed for application in diesel particulate filters. PMID: 29770814 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: De Prins M, Verheyen E, Kerkhofs S, Hoffmann A, Vanbutsele G, Sree SP, Radhakrishnan S, Van Tendeloo L, Breynaert E, Kirschhock CEA, Schütze FW, Martens JA Tags: Chem Commun (Camb) Source Type: research

Visible-light-induced alkoxyl radical generation for inert chemical bond cleavage/functionalization.
Abstract Inert chemical bond cleavage and functionalization reactions provide expedient synthetic routes and are fundamental in organic synthesis. Alkoxyl radicals enable inert chemical bond cleavages by hydrogen atom transfer and β-fragmentation reactivity; however their further synthetic transformations and functional group compatibility are limited by traditional alkoxyl radical generation methods. Recently, visible-light-induced alkoxyl radical generation methods have emerged and led to new advancements in inert chemical bond cleavage reactions and subsequent functionalization, with excellent chemoselecti...
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Jia K, Chen Y Tags: Chem Commun (Camb) Source Type: research

"Low-coordinate" 1,2-oxaphosphetanes - a new opportunity in coordination and main group chemistry.
"Low-coordinate" 1,2-oxaphosphetanes - a new opportunity in coordination and main group chemistry. Chem Commun (Camb). 2018 May 17;: Authors: Kyri AW, Gleim F, García Alcaraz A, Schnakenburg G, Espinosa Ferao A, Streubel R Abstract While 1,2σ5λ5-oxaphosphetanes are well known intermediates from the Wittig-reaction, no 1,2σ3λ3-oxaphosphetanes have been described, so far. Herein, we present the first synthesis of 1,2σ3λ3-oxaphosphetanes derived from their κP-Mo(CO)5 complexes and first investigations towards metal coordination and P-oxidation...
Source: Chemical Communications - May 17, 2018 Category: Chemistry Authors: Kyri AW, Gleim F, García Alcaraz A, Schnakenburg G, Espinosa Ferao A, Streubel R Tags: Chem Commun (Camb) Source Type: research

Characterization of mercury-binding proteins in rat blood plasma.
Abstract Mercury-binding protein profiles in rat plasma at different levels of mercury exposure in vitro and in vivo were systematically investigated using column gel electrophoresis coupled with inductively coupled plasma-mass spectrometry. The current finding provided various protein candidates that may play critical roles in mercury binding and transporting in plasma. PMID: 29771257 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Li Y, He B, Nong Q, Qu G, Liu L, Shi J, Hu L, Jiang G Tags: Chem Commun (Camb) Source Type: research

A bioorthogonal turn-on fluorescent strategy for the detection of lysine acetyltransferase activity.
We reported a panel of "turn-on" fluorescent probes for sensitive and selective detection of KAT enzymatic activity through a simple mix-and-read format. Combined with bioorthogonal substrate labelling and click chemistry, these probes produced strong "turn-on" fluorescent signals in response to KAT-mediated acylation process. This chemical biology strategy diversifies the assay toolboxes to investigate functions and mechanisms of acetyltransferase enzymes. PMID: 29766153 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: He M, Han Z, Qiao J, Ngo L, Xiong MP, Zheng YG Tags: Chem Commun (Camb) Source Type: research

Endowing CuTCNQ with a new role: a high-capacity cathode for K-ion batteries.
Abstract Herein, copper-tetracyanoquinodimethane (CuTCNQ) with phase-I kinetics character has been proposed as an effective cathode for potassium-ion batteries. In a voltage range of 2-4.1 V (vs. K+/K), both cuprous cations (Cu+) and organic anions (TCNQ-) are electrochemically active, and they render a three-electron redox mechanism, thereby enabling CuTCNQ to yield a high specific discharge capacity of 244 mA h g-1. Even after 50 cycles, the discharge capacity of 170 mA h g-1 is retained at 50 mA g-1. In addition, when the current density is elevated to 1000 mA g-1, the discharge capacity is still maintained at ...
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Ma J, Zhou E, Fan C, Wu B, Li C, Lu ZH, Li J Tags: Chem Commun (Camb) Source Type: research

Copper-catalyzed selective radical-radical cross-coupling for C-S bond formation: an access to α-alkylthionitriles.
Copper-catalyzed selective radical-radical cross-coupling for C-S bond formation: an access to α-alkylthionitriles. Chem Commun (Camb). 2018 May 16;: Authors: Zheng C, Lu F, Lu H, Xin J, Deng Y, Yang D, Wang S, Huang Z, Gao M, Lei A Abstract A new protocol for C-S bond formation was developed by selective cross-coupling between a thiyl radical and an isobutyronitrile radical. Using this strategy, a series of valuable α-alkylthionitrile derivatives were synthesized from basic starting materials. Preliminary mechanistic investigation was performed by EPR and XAFS, revealing that the transien...
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Zheng C, Lu F, Lu H, Xin J, Deng Y, Yang D, Wang S, Huang Z, Gao M, Lei A Tags: Chem Commun (Camb) Source Type: research

Synchronous synthesis of Kirkendall effect induced hollow FeSe2/C nanospheres as anodes for high performance sodium ion batteries.
Abstract In this work, we have developed a simple and facile method to synchronously synthesize hollow FeSe2/C nanospheres using the Kirkendall effect. When evaluated as an anode for SIBs, the hollow FeSe2/C nanospheres exhibit a high discharge capacity retention of 474.1 mA h g-1 at 0.05 A g-1 (based on the calculation of FeSe2), which is very close to the theoretical capacity of FeSe2 (∼500 mA h g-1). Meanwhile, hollow FeSe2/C also has a superior rate capability of 364.5 and 316.5 mA h g-1 even at 2.0 and 5.0 A g-1, respectively. The high performance of the hollow FeSe2/C nanospheres can be ascribed to the u...
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Lan Y, Zhou J, Xu K, Lu Y, Zhang K, Zhu L, Qian Y Tags: Chem Commun (Camb) Source Type: research

Electron transfer-induced reduction of organic halides with amines.
Abstract Reduction of a variety of organo halides was examined by using amines as a sacrificial hydrogen source. UV light-induced reduction of vinyl and aryl halides with triethylamine proceeded smoothly to give the corresponding reduced products. High temperature heating also caused the reduction and DABCO (1,4-diazabicyclo[2.2.2]octane) also served as a good reducing reagent. PMID: 29766164 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Fukuyama T, Fujita Y, Miyoshi H, Ryu I, Kao SC, Wu YK Tags: Chem Commun (Camb) Source Type: research

A manganese porphyrin- α-cyclodextrin conjugate as an artificial enzyme for the catalytic epoxidation of polybutadiene.
We describe a manganese porphyrin-α-cyclodextrin conjugate as a catalyst for the epoxidation of cis-polybutadiene with trans-epoxide preference, which is a reverse stereoselectivity as compared to normal porphyrin catalysts. A clamp-like mechanism is proposed based on a combination of circular dichroism analysis, molecular modeling, and a series of epoxidation experiments. PMID: 29766173 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Zhang QW, Elemans JAAW, White PB, Nolte RJM Tags: Chem Commun (Camb) Source Type: research

Redox-active, pyrene-based pristine porous organic polymers for efficient energy storage with exceptional cyclic stability.
Abstract A novel class of pyrene-based conjugated porous organic polymers having an N-containing network was developed by employing Buchwald-Hartwig coupling for supercapacitor energy storage. The pristine polymer was found to exhibit a specific capacitance of 456 F g-1 at 0.5 A g-1 current density with excellent long-term cyclic stability. PMID: 29766177 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Bandyopadhyay S, Singh C, Jash P, Hussain MW, Paul A, Patra A Tags: Chem Commun (Camb) Source Type: research

Piperidinium ionic liquids as electrolyte solvents for sustained high temperature supercapacitor operation.
Abstract The synthesis and physicochemical properties of a series of non-flammable, thermally stable alkyl ether containing piperidinium ionic liquid electrolytes, containing lithium bis(trifluoromethanesulfonyl)imide, are described along with the superior performance of a lithium-ion supercapacitor containing a piperidinium electrolyte compared to a standard carbonate-based electrolyte at 100 °C. PMID: 29766179 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Chapman Varela J, Sankar K, Hino A, Lin X, Chang WS, Coker D, Grinstaff M Tags: Chem Commun (Camb) Source Type: research

Aggregation kinetics of the A β1-40 peptide monitored by NMR.
Aggregation kinetics of the Aβ1-40 peptide monitored by NMR. Chem Commun (Camb). 2018 May 16;: Authors: Bellomo G, Bologna S, Gonnelli L, Ravera E, Fragai M, Lelli M, Luchinat C Abstract The aggregation of Aβ1-40 was monitored by solution NMR, which showed a trend complementary to the one observed by ThT-fluorescence. The NMR data support a kinetic model where Aβ1-40 initially aggregates with the reversible formation of oligomeric species, which then irreversibly convert into fibrils. PMID: 29767190 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Bellomo G, Bologna S, Gonnelli L, Ravera E, Fragai M, Lelli M, Luchinat C Tags: Chem Commun (Camb) Source Type: research

Opposite mechanoluminescence behavior of two isomers with different linkage positions.
Abstract Two isomers of mm-TPE(PI)2 and pp-TPE(PI)2, constructed by the two same aromatic blocks of tetraphenylethene and phenanthro[9,10-d]imidazole, exhibit totally different mechanoluminescence, as a result of the ignorable different linkage positions on the tetraphenylethene moiety. Detailed analysis and theoretical calculations demonstrate the structure-packing-property relationship of organic mechanoluminescent luminogens, with the emphasis on the important role of molecular packing in the solid state. PMID: 29767198 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Liu F, Tu J, Wang X, Wang J, Gong Y, Han M, Dang X, Liao Q, Peng Q, Li Q, Li Z Tags: Chem Commun (Camb) Source Type: research

Organic photocatalysis for the radical couplings of boronic acid derivatives in batch and flow.
We report an acridium-based organic photocatalyst as an efficient replacement for iridium-based photocatalysts to oxidise boronic acid derivatives by a single electron process. Furthermore, we applied the developed catalytic system to the synthesis of four active pharmaceutical ingredients (APIs). A straightforward scale up approach using continuous flow photoreactors is also reported affording gram an hour throughput. PMID: 29767201 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Lima F, Grunenberg L, Rahman HBA, Labes R, Sedelmeier J, Ley SV Tags: Chem Commun (Camb) Source Type: research

Asymmetric synthesis of α-trifluoromethoxy ketones with a tetrasubstituted α-stereogenic centre via the palladium-catalyzed decarboxylative allylic alkylation of allyl enol carbonates.
Asymmetric synthesis of α-trifluoromethoxy ketones with a tetrasubstituted α-stereogenic centre via the palladium-catalyzed decarboxylative allylic alkylation of allyl enol carbonates. Chem Commun (Camb). 2018 May 16;: Authors: Kondo H, Maeno M, Hirano K, Shibata N Abstract The palladium-catalyzed asymmetric decarboxylative allylic alkylation of trifluoromethoxy allyl enol carbonates afforded enantioenriched α-trifluoromethoxy allyl ketones that feature a tetrasubstituted α-stereogenic center in excellent yield and high enantioselectivity. The method was further extended to the...
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Kondo H, Maeno M, Hirano K, Shibata N Tags: Chem Commun (Camb) Source Type: research

Homoleptic uranium and lanthanide phosphinodiboranates.
Abstract Here we report a new class of homoleptic f-element borohydride complexes called phosphinodiboranates. Treating UI3(1,4-dioxane)1.5, NdI3, or ErI3, with three equiv. of K(H3BPtBu2BH3) in Et2O yielded M2(H3BPtBu2BH3)6, where M = U, Nd, and Er. All three complexes form solid-state dimers, but exist as mixtures of monomers and dimers in solution. PMID: 29767205 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 16, 2018 Category: Chemistry Authors: Blake AV, Fetrow TV, Theiler ZJ, Vlaisavljevich B, Daly SR Tags: Chem Commun (Camb) Source Type: research

Tuning the electronic properties of thiophene-annulated NDIs: the influence of the lateral fusion position.
Abstract A new asymmetric thiophene-annulated NDI (NTTI) has been designed and synthesized. NTTI exhibits an enhanced polarized electronic structure relative to the symmetric analogue (NDTI). The fusion position of thiophene affects the optical, electrochemical, and charge transport properties. The OFET device based on single crystalline microribbons of C8-NTTI shows an electron mobility up to 1.47 cm2 V-1 s-1. PMID: 29761179 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Wen J, Xiao C, Lv A, Hayashi H, Zhang L Tags: Chem Commun (Camb) Source Type: research

Covalent switching, involving divinylbenzene ligands within 3D coordination polymers, indicated by changes in fluorescence.
Abstract Reversible cycloaddition reactions between 1,4-bis[2-(3-pyridyl)ethenyl]benzene and its photodimers were performed within a pair of three-dimensional coordination polymers with retention of single crystal character. In each case, switching between two crystalline forms could be followed by monitoring the flourescence behaviour. PMID: 29761180 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Li NY, Liu D, Abrahams BF, Lang JP Tags: Chem Commun (Camb) Source Type: research

Self-assembly and ring-opening metathesis polymerization of cyclic conjugated molecules on highly ordered pyrolytic graphite.
Abstract Cyclic conjugated monomers comprising cyclopentadithiophene-vinylene trimers and their polymers on HOPG are observed using STM and AFM. ROMP of the monomers is performed using a Grubbs catalyst. Their STM images exhibit single chains of planar polymers, whereas their AFM images show elongation of the polymer chains on HOPG. PMID: 29761181 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Chiu ST, Chiang HY, Lin YJ, Lu YY, Tanaka H, Hosokai T, Horie M Tags: Chem Commun (Camb) Source Type: research

Regioselective C-H alkenylation of imidazoles and its application to the synthesis of unsymmetrically substituted benzimidazoles.
Abstract A palladium-catalyzed C-H alkenylation of imidazoles has been developed. High C5 selectivity was achieved for C2-unsubstituted and C2-substituted imidazoles using oxygen and copper(ii) acetate, respectively, as oxidants. The obtained products were applied to benzannulation through a sequence involving transposition of N-alkyl groups to give C4-alkenyl imidazoles, alkenylation, thermal 6π-electrocyclization, and oxidation, affording unsymmetrically substituted benzimidazoles. PMID: 29761186 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Kim H, Hwang YJ, Han I, Joo JM Tags: Chem Commun (Camb) Source Type: research

Highlights from the Faraday Discussion on Ionic Liquids: From Fundamental Properties to Practical Applications, Cambridge, UK, September 2017.
Discussion on Ionic Liquids: From Fundamental Properties to Practical Applications, Cambridge, UK, September 2017. Chem Commun (Camb). 2018 May 15;: Authors: Aldous L, Bendova M, Gonzalez-Miquel M, Swadźba-Kwaśny M Abstract For the third time, a Faraday Discussion addressed ionic liquids. Encompassing the wealth of research in this field, the contributions ranged from fundamental insights to the diverse applications of ionic liquids. Lively discussions initiated in the lecture hall and during poster sessions then seamlessly continued during the social program. PMID: 29761191 [PubMed - as suppli...
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Aldous L, Bendova M, Gonzalez-Miquel M, Swadźba-Kwaśny M Tags: Chem Commun (Camb) Source Type: research

Controlled photorelease of alkynoic acids and their decarboxylative deprotection for copper-catalyzed azide/alkyne cycloaddition.
C, Klán P Abstract A controlled photorelease of alkynoic acids from the meso-methyl BODIPY photoremovable protecting group facilitates their subsequent efficient decarboxylation to give terminal alkynes for a CuI-catalyzed azide/alkyne cycloaddition. The quantum efficiencies of the photochemical step and the kinetics of the click reaction step are reported. PMID: 29761798 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Vohradská N, Sánchez-Carnerero EM, Pastierik T, Mazal C, Klán P Tags: Chem Commun (Camb) Source Type: research

Abnormal sergeants-and-soldiers effects of poly(quinoxaline-2,3-diyl)s enabling discrimination of one-carbon homologous n-alkanes through a highly sensitive solvent-dependent helix inversion.
Abstract Poly(quinoxaline-2,3-diyl)s bearing (S)-3-octyloxymethyl and n-propoxymethyl side chains show an abnormal sergeants-and-soldiers effect in n-alkane solvents, which allows the development of a series of PQXs that exhibit an extremely sensitive solvent-dependent helix inversion that permits the discrimination of n-alkane solvents that differ by a single methylene group (e.g. n-heptane and n-octane). PMID: 29761800 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Nagata Y, Nishikawa T, Suginome M Tags: Chem Commun (Camb) Source Type: research

Electrocatalytic and photocatalytic hydrogen evolution integrated with organic oxidation.
Abstract Renewable energy-driven hydrogen production from electrocatalytic and photocatalytic water splitting has been widely recognized as a promising approach to utilize green energy resources and hence reduces our dependence on legacy fossil fuels as well as alleviates net carbon dioxide emissions. The realization of large-scale water splitting, however, is mainly impeded by its slow kinetics, particularly because of its sluggish anodic half reaction, the oxygen evolution reaction (OER), whose product O2 is ironically not of high value. In fact, the co-production of H2 and O2 in conventional water electrolysis ...
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: You B, Han G, Sun Y Tags: Chem Commun (Camb) Source Type: research

Photochemical reductive homologation of hydrogen cyanide using sulfite and ferrocyanide.
Abstract Photoredox cycling during UV irradiation of ferrocyanide ([FeII(CN)6]4-) in the presence of stoichiometric sulfite (SO32-) is shown to be an extremely effective way to drive the reductive homologation of hydrogen cyanide (HCN) to simple sugars and precursors of hydroxy acids and amino acids. PMID: 29761807 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Xu J, Ritson DJ, Ranjan S, Todd ZR, Sasselov DD, Sutherland JD Tags: Chem Commun (Camb) Source Type: research

Diversion of a thioglycoligase for the synthesis of 1-O-acyl arabinofuranoses.
til L Abstract An arabinofuranosylhydrolase from the GH51 family was transformed into an acyl transferase by mutation of the catalytic acid/base amino acid. The resulting enzyme was able to transfer carboxylic acid onto the anomeric position of arabinose with complete chemo- and stereoselectivity. A wide range of acyl α-l-arabinofuranoses was obtained with yields ranging from 25 to 83%. Using this method, ibuprofen and N-Boc phenylalanine were successfully transformed into their corresponding acyl conjugates, expanding the scope of the reaction to drugs and amino acids. PMID: 29761808 [PubMed - as suppl...
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Pavic Q, Tranchimand S, Lemiègre L, Legentil L Tags: Chem Commun (Camb) Source Type: research

Strained azabora[2]ferrocenophanes.
r J Abstract Three [2]ferrocenophanes equipped with unsaturated BN moieties at bridging positions were synthesized and structurally characterized. As revealed by DFT calculations, these first examples of azabora[2]ferrocenophanes are similarly strained to the well-known Me2Si-bridged [1]ferrocenophane. PMID: 29761819 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Bhattacharjee H, Dey S, Zhu J, Sun W, Müller J Tags: Chem Commun (Camb) Source Type: research

Ultrasonic-assisted preparation of a pinhole-free BiVO4 photoanode for enhanced photoelectrochemical water oxidation.
Abstract A pinhole-free BiVO4 electrode was successfully synthesized using an ultrasonic-assisted synthetic method on a conductive substrate. The pinhole-free BiVO4 electrode showed highly improved photoelectrochemical activity for both sulfite oxidation and water oxidation. The blocking recombination processes were examined to clarify the enhanced photoelectrochemical performances. PMID: 29761820 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Park G, Park JY, Seo JH, Oh KH, Ma A, Nam KM Tags: Chem Commun (Camb) Source Type: research

Synthetic studies on daphniglaucins.
Abstract The synthetic approach to the core framework of daphniglaucin-type Daphniphyllum alkaloids is described herein. The B-C ring was constructed via a Rh-catalyzed [3+2] cycloaddition. Continuous quaternary centers were installed through [3+2] cycloaddition and alkylation. The attempt to build the A-D ring motif using dipolar cycloaddition of azomethine ylides was extensively investigated. PMID: 29761821 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 15, 2018 Category: Chemistry Authors: Qiu Y, Zhong J, Du S, Gao S Tags: Chem Commun (Camb) Source Type: research

Corannulene: a molecular bowl of carbon with multifaceted properties and diverse applications.
Abstract Unlike typical polycyclic aromatic hydrocarbons, such as coronene, which are flat and planar, corannulene is a molecular bowl of carbon. It can be imagined as the cap region of fullerene C60 or an end of a single-walled carbon nanotube. This structural distinction manifests itself in unique properties. For example, corannulene exhibits bowl-flipping dynamics, electron accepting capability, and formation of a ball-in-socket type of interaction with C60. These varied properties allow for application of corannulene in a myriad of disciplines ranging from organic electronics and sensing to energy storage and ...
Source: Chemical Communications - May 14, 2018 Category: Chemistry Authors: Nestoros E, Stuparu MC Tags: Chem Commun (Camb) Source Type: research

A new ether-based electrolyte for lithium sulfur batteries using a S@pPAN cathode.
Abstract A new electrolyte composed of 4 M LiFSI in dibutyl ether (DBE) is proposed for Li-S batteries. Dissolution of lithium polysulfides is definitely inhibited by DBE. More impressively, the electrolyte ensures a high Coulombic efficiency for Li deposition/stripping (∼99.2%) without dendrite growth. Enhanced cycling stability is demonstrated when coupled with a sulfurized poly(acrylonitrile) (S@pPAN) cathode. This electrolyte offers new insight into electrolyte design for high performance Li-S batteries. PMID: 29756149 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 14, 2018 Category: Chemistry Authors: Zhou J, Guo Y, Liang C, Cao L, Pan H, Yang J, Wang J Tags: Chem Commun (Camb) Source Type: research

Rechargeable aqueous zinc-iodine batteries: pore confining mechanism and flexible device application.
Abstract Here we report a flexible and rechargeable aqueous Zn-iodine battery with an iodine/carbon cloth cathode. Combined experimental and computational studies suggest that the battery undergoes a reversible reaction of Zn + I2 ↔ ZnI2 with suppressed I3- formation by confining iodine species in porous carbon. PMID: 29756150 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 14, 2018 Category: Chemistry Authors: Li Y, Liu L, Li H, Cheng F, Chen J Tags: Chem Commun (Camb) Source Type: research

A quasi-solid-state and self-powered biosupercapacitor based on flexible nanoporous gold electrodes.
Abstract A quasi-solid-state and flexible biofuel cell using a hydrogel electrolyte preloaded with sugar as a fuel is described. The device can function as a self-powered biosupercapacitor delivering pulses for over 600 cycles, with a power density over 10 times higher than that from the biofuel cell alone. PMID: 29756152 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 14, 2018 Category: Chemistry Authors: Xiao X, Magner E Tags: Chem Commun (Camb) Source Type: research

Electrolyte-gated transistors based on phenyl-C61-butyric acid methyl ester (PCBM) films: bridging redox properties, charge carrier transport and device performance.
Abstract The n-type organic semiconductor phenyl-C61-butyric acid methyl ester (PCBM), a soluble fullerene derivative well investigated for organic solar cells and transistors, can undergo several successive reversible, diffusion-controlled, one-electron reduction processes. We exploited such processes to shed light on the correlation between electron transfer properties, ionic and electronic transport as well as device performance in ionic liquid (IL)-gated transistors. Two ILs were considered, based on bis(trifluoromethylsulfonyl)imide [TFSI] as the anion and 1-ethyl-3-methylimidazolium [EMIM] or 1-butyl-1-methy...
Source: Chemical Communications - May 14, 2018 Category: Chemistry Authors: Lan T, Soavi F, Marcaccio M, Brunner PL, Sayago J, Santato C Tags: Chem Commun (Camb) Source Type: research

Photocatalytic acylarylation of unactivated alkenes with diaryliodonium salts toward indanones and related compounds.
Abstract A novel photocatalytic acylarylation of unactivated alkenes using diaryliodonium salts as the arylation reagent is described. The reaction produces a variety of 2-benzyl indanones, 3,4-dihydronaphthalen-1(2H)-ones, and 2,3-dihydroquinolin-4(1H)-ones in promising yields with excellent diastereoselectivity under very mild conditions, which may be appealing for the synthesis of biologically active molecules. PMID: 29756622 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 14, 2018 Category: Chemistry Authors: Chen Y, Shu C, Luo F, Xiao X, Zhu G Tags: Chem Commun (Camb) Source Type: research

Small bite-angle 2-phosphinophosphinine ligands enable rhodium-catalysed hydroboration of carbonyls.
Abstract Two Rh complexes of the 2-phosphinophosphinine ligand 2-PPh2-3-Me-6-SiMe3-C5H2P (1) were prepared: dinuclear trans-[{Rh(CO)(Cl)(μ-1)}2] (2) and chelating [Rh(1)(COD)][B(ArF)4] (3). Despite the widespread use of Rh catalysts for the hydroboration of alkenes, 3 is reported to be the first Rh catalyst for ketone and ketimine hydroboration, with high activity observed at 0.1 mol% loading. PMID: 29756624 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 14, 2018 Category: Chemistry Authors: Newland RJ, Lynam JM, Mansell SM Tags: Chem Commun (Camb) Source Type: research

Metabolic glycan labeling-assisted discovery of cell-surface markers for primary neural stem and progenitor cells.
Abstract A chemical approach was developed for identifying cell-surface markers for primary neural stem cells (NSCs). Using an in vitro coculture system of primary NSCs combined with metabolic labeling of sialoglycans with bioorthogonal functional groups, we selectively enriched and identified a list of cell-surface sialoglycoproteins that were more abundantly expressed in neural stem and progenitor cells. PMID: 29756626 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 14, 2018 Category: Chemistry Authors: Bai QR, Dong L, Hao Y, Chen X, Shen Q Tags: Chem Commun (Camb) Source Type: research

New perspectives for triplet-triplet annihilation based photon upconversion using all-organic energy donor & acceptor chromophores.
New perspectives for triplet-triplet annihilation based photon upconversion using all-organic energy donor & acceptor chromophores. Chem Commun (Camb). 2018 May 11;: Authors: Manna MK, Shokri S, Wiederrecht GP, Gosztola DJ, Ayitou AJ Abstract It is recognized that metal organic complexes that serve as sensitizers can present various degrees of challenges viz. synthesis and stability for photonic applications such as triplet-triplet annihilation based photon upconversion (TTA-PUC). Presently, researchers, including our group, are turning their attention toward purely organic triplet sensitizers, wh...
Source: Chemical Communications - May 11, 2018 Category: Chemistry Authors: Manna MK, Shokri S, Wiederrecht GP, Gosztola DJ, Ayitou AJ Tags: Chem Commun (Camb) Source Type: research

Redox properties of alluaudite sodium cobalt manganese sulfates as high-voltage electrodes for rechargeable batteries.
Abstract Alluaudite sulfates are predicted to be high-voltage electrodes for lithium- and sodium-ion batteries. Herein, we provide the first experimental evidence for the operation of sodium cobalt-manganese sulfate, Na2+2δ(Co0.63Mn0.37)2-δ(SO4)3, at potentials higher than 4.0 V vs. Li/Li+. This fact comes as a result of the reduced cationic deficiency, redox properties of Co and Mn and stability of the alluaudite structure during alkali ion intercalation. PMID: 29749409 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 11, 2018 Category: Chemistry Authors: Marinova DM, Kostov VV, Nikolova RP, Kukeva RR, Zhecheva EN, Stoyanova RK Tags: Chem Commun (Camb) Source Type: research

The journey of tin chalcogenides towards high-performance thermoelectrics and topological materials.
Abstract Lead chalcogenides and their alloys belong at the heart of thermoelectrics due to their large thermoelectric figure of merit (zT). However, recent research has shown a limitation in the use of lead (Pb)-based materials due to their toxicity and efforts have been made to produce non-toxic analogues of lead chalcogenides. Tin chalcogenides have been predicted to be promising for this purpose due to their unique electronic structure and phonon dispersion properties. Here, we discuss the journey of tin chalcogenides in the field of thermoelectrics and topological materials with the main emphasis on the bondin...
Source: Chemical Communications - May 11, 2018 Category: Chemistry Authors: Banik A, Roychowdhury S, Biswas K Tags: Chem Commun (Camb) Source Type: research

A dual-function fluorescent probe for monitoring the degrees of hypoxia in living cells via the imaging of nitroreductase and adenosine triphosphate.
Abstract A new dual-function fluorescent probe is developed for detecting nitroreductase (NTR) and adenosine triphosphate (ATP) with different responses. Imaging application of the probe reveals that intracellular NTR and ATP display an adverse changing trend during a hypoxic process and ATP can serve as a new sign for cell hypoxia. PMID: 29749411 [PubMed - as supplied by publisher] (Source: Chemical Communications)
Source: Chemical Communications - May 11, 2018 Category: Chemistry Authors: Fang Y, Shi W, Hu Y, Li X, Ma H Tags: Chem Commun (Camb) Source Type: research