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Chemical Communications: Chem Comm

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https://www.readbyqxmd.com/read/27933326/correction-%C3%AE-sini2w10o36-oh-2-h2o-4-24-a-new-robust-visible-light-driven-water-oxidation-catalyst-based-on-nickel-containing-polyoxometalate
#1
Li Yu, Yong Ding, Min Zheng, Hongli Chen, Junwei Zhao
Correction for '[{β-SiNi2W10O36(OH)2(H2O)}4](24-): a new robust visible light-driven water oxidation catalyst based on nickel-containing polyoxometalate' by Li Yu et al., Chem. Commun., 2016, DOI: 10.1039/c6cc02728h.
December 9, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929169/-18-f-fluoride-capture-and-release-azeotropic-drying-free-nucleophilic-aromatic-radiofluorination-assisted-by-a-phosphonium-borane
#2
Cécile Perrio, Sébastien Schmitt, Daniel Pla, François P Gabbaï, Kantapat Chansaenpak, Béatrice Mestre-Voegtle, Emmanuel Gras
[(18)F]-Fluoride ready for aromatic nucleophilic substitution was prepared according to a simple process including trapping of aqueous [(18)F]-fluoride on a cartridge pre-loaded with the phosphonium borane [(Ph2MeP)C6H4(BMes2)](+), then releasing by elution of TBACN in dry acetonitrile. Subsequent radiofluorination was successfully applied to a model reaction and to the radiosynthesis of [(18)F]-setoperone.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929165/occurrence-of-photoinduced-charge-separation-by-the-modulation-of-the-electronic-coupling-between-pyrene-dimers-and-chemically-converted-graphenes
#3
Tomokazu Umeyama, Jinseok Baek, Junya Mihara, Nikolai V Tkachenko, Hiroshi Imahori
The photoexcitation of the pyrene dimer on graphene resulted in the final formation of a charge-separated state following an exciplex formation, while that of the pyrene monomer on graphene generated the corresponding exciplex solely due to the difference in the electronic coupling between the pyrene and the graphene.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929152/synthesis-of-nh-sulfoximines-from-sulfides-by-chemoselective-one-pot-n-and-o-transfers
#4
Arianna Tota, Marina Zenzola, Stephen J Chawner, Sahra St John-Campbell, Claudia Carlucci, Giuseppe Romanazzi, Leonardo Degennaro, James A Bull, Renzo Luisi
Direct synthesis of NH-sulfoximines from sulfides has been achieved through O and NH transfer in the same reaction, occurring with complete selectivity. The reaction is mediated by bisacetoxyiodobenzene under simple conditions and employs inexpensive N-sources. Preliminary studies indicate that NH-transfer is likely to be first, followed by oxidation, but the reaction proceeds successfully in either order. A wide range of functional groups and biologically relevant compounds are tolerated. The use of AcO(15)NH4 affords (15)N-labeled compounds...
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929150/correction-remote-meta-c-h-bond-functionalization-of-2-phenethylsulphonic-acid-and-3-phenylpropanoic-acid-derivatives
#5
Atanu Modak, Anirban Mondal, Rahul Watile, Semanti Mukherjee, Debabrata Maiti
Correction for 'Remote meta C-H bond functionalization of 2-phenethylsulphonic acid and 3-phenylpropanoic acid derivatives' by Atanu Modak et al., Chem. Commun., 2016, 52, 13916-13919.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929149/a-one-carbon-staple-for-orthogonal-copper-catalyzed-azide-alkyne-cycloadditions
#6
Karen Wright, Pierre Quinodoz, Bruno Drouillat, François Couty
We describe herein the use of α-hydroxy-β-azidotetrazoles, easily prepared in one step from α,β-epoxynitriles, as new scaffolds for orthogonal CuAAC reactions performed on the same carbon atom. After a first ligation involving an alkyne with the β-azido moiety, treatment with EDC smoothly releases an alkyne from the remaining α-hydroxytetrazole, ready for a second CuAAC reaction. This "double click" process can be performed iteratively, leading to triazolamers.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929148/interactions-between-%C3%AF-conjugated-chromophores-in-a-giant-molecular-spoked-wheel
#7
D Würsch, R May, G Wiederer, S-S Jester, S Höger, J Vogelsang, J M Lupton
We discuss the intriguing photophysics of a giant molecular spoked wheel of π-conjugated arylene-alkynylene chromophores on the single-molecule level. This "molecular mesoscopic" structure, C1878H2682, shows fast switching between the 12 identical chromophores since the fluorescence is unpolarised but only one chromophore emits at a time.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929147/simultaneous-detection-of-multiple-targets-involved-in-the-pi3k-akt-pathway-for-investigating-cellular-migration-and-invasion-with-a-multicolor-fluorescent-nanoprobe
#8
Mingming Luan, Na Li, Wei Pan, Limin Yang, Zhengze Yu, Bo Tang
We develop a multicolor fluorescent nanoprobe for assessing cellular migration and invasion by simultaneously imaging miRNA-221, PTEN mRNA and MMP-9 involved in the PI3K/AKT pathway which can regulate cellular mobility and invasiveness.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929146/reactivity-of-the-nitrogen-centered-tryptophanyl-radical-in-the-catalysis-by-the-radical-sam-enzyme-nosl
#9
Haocheng Qianzhu, Wenjuan Ji, Xinjian Ji, Leixia Chu, Chuchu Guo, Wei Lu, Wei Ding, Jiangtao Gao, Qi Zhang
The radical SAM tryptophan (Trp) lyase NosL involved in nosiheptide biosynthesis catalyzes two parallel reactions, converting l-Trp to 3-methyl-2-indolic acid (MIA) and to dehydroglycine and 3-methylindole, respectively. The two parallel reactions diverge from a nitrogen-centered tryptophanyl radical intermediate. Here we report an investigation on the intrinsic reactivity of the tryptophanyl radical using a chemical model study and DFT calculations. The kinetics of the formation and fragmentation of this nitrogen-centered radical in NosL catalysis were also studied in detail...
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27929145/highly-efficient-hydrolysis-of-ammonia-borane-by-anion-oh-f-cl-tuned-interactions-between-reactant-molecules-and-cop-nanoparticles
#10
Zi-Cheng Fu, Yong Xu, Sharon Lai-Fung Chan, Wei-Wei Wang, Fang Li, Fei Liang, Yong Chen, Zhe-Shuai Lin, Wen-Fu Fu, Chi-Ming Che
The CoP nanoparticle catalyst had excellent catalytic activity and a short catalytic induction period in the presence of anions, and high sustainability in ammonia borane hydrolysis, with an initial turnover frequency of 72.2 mol(H2) mol(CoP)(-1) min(-1) at ambient temperature. This value is unprecedented for noble-metal-free catalytic systems.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928569/planar-pentacoordinate-carbon-atoms-embedded-in-a-metallocene-framework
#11
Zhong-Hua Cui, Valentin Vassilev-Galindo, José Luis Cabellos, Edison Osorio, Mesías Orozco, Sudip Pan, Yi-Hong Ding, Gabriel Merino
Viable planar pentacoordinate carbon (ppC) systems with a ppC bonded to a transition metal and embedded in a metallocene framework are reported. Our detailed global minima search shows that CAl4MX2 (M = Zr and Hf; X = F-I and C5H5) clusters with ppCs are appropriate candidates for experimental realization in the gas phase. The fulfillment of the 18 electron rule and electron delocalization is found to be crucial for the stabilization of these ppC arrangements.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928568/ormochalcs-organically-modified-chalcogenide-polymers-for-infrared-optics
#12
D A Boyd, C C Baker, J D Myers, V Q Nguyen, G A Drake, C C McClain, F H Kung, S R Bowman, W Kim, J S Sanghera
A novel method combining elemental sulfur and selenium was developed, yielding crystalline sulfur-selenium compounds. The compounds were melted, and an organic comonomer added. Once the organic comonomer was consumed, the viscous compound was vitrified and allowed to cool yielding organic-inorganic hybrid polymers that are termed Organically Modified Chalcogenide (ORMOCHALC) polymers.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928567/tracking-silver-delivery-to-bacteria-using-turn-on-fluorescence
#13
Miguel N Pinto, Indranil Chakraborty, Wiley Schultz-Simonton, Mauricio Rojas-Andrade, Rebecca Braslau, Pradip K Mascharak
Herein we present a novel silver complex [Ag(qBODIPY)(CF3SO3)] (1) that exhibits dramatic increase in fluorescence upon silver release. Complex 1 has a minimum inhibitory concentration comparable to that of silver nitrate. Confocal microscopy was used to track the delivery of silver to bacterial targets.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928566/ag-coordination-polymers-of-a-chiral-thiol-ligand-bearing-an-aie-fluorophore
#14
Dan-Dan Tao, Qian Wang, Xiao-Sheng Yan, Na Chen, Zhao Li, Yun-Bao Jiang
We report that in the Ag(+) coordination polymers of a chiral thiol ligand containing an AIE fluorophore, tetraphenylethene (TPE), the TPE chromophores experience H-type aggregation, and yet a substantial enhancement of the fluorescence is observed, though to a lesser extent than that in the aggregates of the thiol ligand itself, which undergoes J-type aggregation. We show that this is not due to the difference in the freedom of the rotation of the fluorophore in the two types of aggregate, but is due to a small increase in the radiation rate constant in the coordination polymers while the much higher radiationless rate constant remains more or less unchanged...
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928565/reduced-thione-ligation-is-preferred-over-neutral-phosphine-ligation-in-diiron-biomimics-regarding-electronic-functionality-a-spectroscopic-and-computational-investigation
#15
Tao-Hung Yen, Zong-Cheng He, Gene-Hsiang Lee, Mei-Chun Tseng, Yu-Hsuan Shen, Tien-Wen Tseng, Wen-Feng Liaw, Ming-Hsi Chiang
Sulfur containing ligands with a thiolate-thiyl radical character are much superior than phosphine ligands in the active site modeling of [FeFe]hydrogenase regarding electronic functionality on charge communication and modulation of the electronic structure of the catalytic metal center.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928564/accessing-the-inaccessible-discrete-multinuclear-coordination-complexes-and-selective-anion-binding-attainable-only-by-tethering-ligands-together
#16
Basil M Ahmed, Gellert Mezei
Novel multimetallic copper pyrazolate complexes, inaccessible using simple pyrazole ligands due to competing, alternative structural motifs, can be obtained by locking pairs of pyrazole ligands together with ethylene tethers. Nanojars based on this tethered pyrazole ligand display unexpected total selectivity for the carbonate over the sulfate ion.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928563/sumanene-derivatives-functionalized-at-the-internal-carbon
#17
Niti Ngamsomprasert, Jing-Shuang Dang, Shuhei Higashibayashi, Yumi Yakiyama, Hidehiro Sakurai
The first sumanene derivatives functionalized at the convex face of the internal carbon were reported. The structure of racemic hydroxysumanenone was confirmed by X-ray crystal analysis. The obtained structure was composed of the single enantiomer.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928562/an-unexpected-copper-catalyzed-carbonylative-acetylation-of-amines
#18
Yahui Li, Changsheng Wang, Fengxiang Zhu, Zechao Wang, Jean François Soulé, Pierre H Dixneuf, Xiao-Feng Wu
A novel copper-catalyzed carbonylative acetylation of amines has been developed. With peroxide as the oxidant as well as the methyl source with a copper catalyst under CO pressure, good yields of N-acetyl amides could be obtained. Notably, this is the first example of carbonylative acetylation.
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928561/near-infrared-photoswitching-of-cyclodextrin-guest-complexes-using-lanthanide-doped-liyf4-upconversion-nanoparticles
#19
Nadja Möller, Tim Hellwig, Lucas Stricker, Sabrina Engel, Carsten Fallnich, Bart Jan Ravoo
This communication reports a new type of supramolecular cyclodextrin-guest complexes using cyclodextrin coated upconversion nanoparticles as hosts and monovalent and divalent azobenzenes and arylazopyrazoles as guests. A potentially biocompatible photocontrol of the interaction by isomerization of the azobenzene or arylazopyrazole was achieved by laser irradiation at 980 nm and a very low light intensity of 0.22 W cm(-2).
December 8, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27928560/a-novel-electron-acceptor-moiety-as-a-building-block-for-efficient-donor-acceptor-based-fluorescent-organic-lighting-emitting-diodes
#20
Miao-Miao Xue, Chen-Chao Huang, Yi Yuan, Ye-Xin Zhang, Man-Keung Fung, Liang-Sheng Liao
A new electron-withdrawing moiety (BFPz) has been used for the first time as an acceptor in OLEDs and its corresponding core unit (2-Br-BFPz) was synthesized. Combined with an electron-donating moiety triphenylamine, a novel fluorescent material with a D-A structure named TPA-BFPz was synthesized. Encouragingly, the EQE values of non-doped and doped blue OLEDs reach 3.68% and 4.42%, respectively.
December 8, 2016: Chemical Communications: Chem Comm
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