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Chemical Communications: Chem Comm

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https://www.readbyqxmd.com/read/28737812/a-dft-mechanistic-study-of-the-organocatalytic-asymmetric-reaction-of-aldehydes-and-homophthalic-anhydride
#1
Cristina Trujillo, Isabel Rozas, Astrid Botte, Stephen J Connon
The first DFT study of the cycloaddition of benzaldehyde with homophthalic anhydride under the influence of a bifunctional organocatalyst is reported. The catalyst first binds and then deprotonates the anhydride, leading to a squaramide-bound enolate, which then adds to the aldehyde with activation of the electrophile by the catalyst's ammonium ion.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737811/extremely-low-catalyst-loading-for-electroless-deposition-on-a-non-conductive-surface-by-a-treatment-for-reduced-graphene-oxide
#2
Jing Zhan, Desmond C L Tan, Swaek Prakitritanon, Ming Lin, Hirotaka Sato
Enhancement of electroless deposition using reduced-graphene-oxide (rGO) coating for a conductive surface on the non-conductive substrate is proposed and demonstrated. We confirmed that the rGO treatment enhanced the Pd catalytic activity and achieved a sufficient rate in electroless deposition with extremely low Pd loading (3.94 × 10(-2) μg cm(-2)).
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737805/nonhelical-heterometallic-mo2m-npo-4-ncs-2-string-complexes-m-fe-co-ni-with-high-single-molecule-conductance
#3
Wei-Cheng Chang, Che-Wei Chang, Marc Sigrist, Shao-An Hua, Tsai-Jung Liu, Gene-Hsiang Lee, Bih-Yaw Jin, Chun-Hsien Chen, Shie-Ming Peng
Using the planar 1,8-naphthyridin-2(1H)-one (Hnpo) ligand, novel nonhelical HMSCs [Mo2M(npo)4(NCS)2] (M = Fe, Co, Ni) were synthesised and they exhibited high single-molecule conductance.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737799/slow-magnetic-relaxation-in-five-coordinate-spin-crossover-cobalt-ii-complexes
#4
Hui-Hui Cui, Jing Wang, Xue-Tai Chen, Zi-Ling Xue
We present the first examples of the coexistence of field induced slow magnetic relaxation and spin-crossover observed in five-coordinate cobalt(ii) complexes [Co(12-TMC)(CH3CN)](X)2 (12-TMC = 1,4,7,10-tetramethyl-1,4,7,10-tetraazacyclododecane, X = BF4(-), 1; PF6(-), 2). The direct-current (dc) magnetic data show a gradual and incomplete spin-crossover at high temperature. 1 and 2 display frequency- and temperature-dependent alternating-current (ac) magnetic susceptibility under an applied dc field of 2500 Oe, which originates from the S = 1/2 spin state of Co(ii) ions...
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737795/a-dna-nanoribbon-as-a-potent-inhibitor-of-metallo-%C3%AE-lactamases
#5
Xiangyuan Ouyang, Ya-Nan Chang, Ke-Wu Yang, Wen-Ming Wang, Jian-Jian Bai, Jian-Wei Wang, Yue-Juan Zhang, Si-Yao Wang, Bin-Bin Xie, Li-Li Wang
We discovered a promising metallo-β-lactamase inhibitor, a DNA nanoribbon, by enzymatic kinetics and isothermal titration calorimetry evaluations. Atomic force microscopy, gel electrophoresis, competitive binding experiments, circular dichroic and thermal denaturation studies suggested that the DNA nanoribbon could bind to the enzyme through a minor groove.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737794/heterogeneous-enantioselective-synthesis-of-chromans-via-the-oxa-michael-michael-cascade-reaction-synergically-catalyzed-by-grafted-chiral-bases-and-inherent-hydroxyls-on-mesoporous-silica-surface
#6
Shanshan Wang, Jing He, Zhe An
A heterogeneous enantioselective oxa-Michael-Michael reaction for the synthesis of chromans has been developed on a heterogeneous acid-base synergic catalyst with inherent silica as acidic sites and immobilized chiral amines as basic sites. Final products were afforded in selectivity of up to 98% and ee of 97% from 2-nitrovinyl phenol and 3-methyl-2-butenal. The heterogeneous synergistic catalytic mechanism has also been studied.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737786/fluorescence-emission-originated-from-the-h-aggregated-cyanine-dye-with-chiral-gemini-surfactant-assemblies-having-a-narrow-absorption-band-and-a-remarkably-large-stokes-shift
#7
Naoya Ryu, Yutaka Okazaki, Emilie Pouget, Makoto Takafuji, Shoji Nagaoka, Hirotaka Ihara, Reiko Oda
We demonstrate that the fluorescence emission that originated from a cyanine dye forming H-aggregates with a narrow absorption band and a remarkably large Stokes shift can be induced by symmetry breaking. The H-aggregate formation was successfully induced using chirally assembled cationic gemini surfactants with enantiomeric tartrate counterions as templates in water.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737778/intense-redox-driven-chiroptical-switching-with-a-580-mv-hysteresis-actuated-through-reversible-dimerization-of-an-azoniahelicene
#8
Jochen R Brandt, Lubomír Pospíšil, Lucie Bednárová, Rosenildo Correa da Costa, Andrew J P White, Tadashi Mori, Filip Teplý, Matthew J Fuchter
Electrochemical reduction of an azoniahelicene affords a dimer, accompanied by a strong change in the electronic circular dichroism. The fast dimerisation event leads to a >500 mV shift of the oxidation potential, affording a large area of bistability, where the chiroptical signal only depends on the redox history.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737777/post-synthetic-transformation-of-a-zn-ii-polyhedral-coordination-network-into-a-new-supramolecular-isomer-of-hkust-1
#9
Yao Chen, Lukasz Wojtas, Shengqian Ma, Michael J Zaworotko, Zhenjie Zhang
A Zn-based porphyrin containing metal-organic material (porphMOM-1) was transformed into a novel Cu-based porphyrin-encapsulating metal-organic material (porph@HKUST-1-β) via a one-pot post-synthetic modification (PSM) process involving both metal ion exchange and linker installation of trimesic acid. HKUST-1-β is the first example of yao topology and is to our knowledge the first supramolecular isomer of the archetypal coordination network HKUST-1.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737186/ionic-liquid-omim-oac-directly-inducing-oxidation-cleavage-of-the-%C3%AE-o-4-bond-of-lignin-model-compounds
#10
Yingying Yang, Honglei Fan, Qinglei Meng, Zhaofu Zhang, Guanying Yang, Buxing Han
We explored the oxidation reactions of lignin model compounds directly induced by ionic liquids under metal-free conditions. In this work, it was found that ionic liquid 1-octyl-3-methylimidazolium acetate as a solvent could promote the aerobic oxidation of lignin model compound 2-phenoxyacetophenone (1) and the yields of phenol and benzoic acid from 1 could be as high as 96% and 86%, respectively. A possible reaction pathway was proposed based on a series of control experiments. An acetate anion from the ionic liquid attacked the hydrogen from the β-carbon thereby inducing the cleavage of the C-O bond of the aromatic ether...
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737184/a-switchable-electrochromism-and-electrochemiluminescence-bifunctional-sensor-based-on-the-electro-triggered-isomerization-of-spiropyran-layered-double-hydroxides
#11
Zhixiong Li, Yuqiong Zhou, Liuqi Peng, Dongpeng Yan, Min Wei
A bifunctional ultrathin film (UTF) electrode was fabricated based on layered double hydroxides (LDHs) and spiropyran (SP), which exhibited electrochromism and electrochemiluminescence (ECL) sensing behavior toward temperature and Zn(2+) ions.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737183/new-lnocl-ln-sm-nd-photocatalyst-and-novel-cocatalytic-effect-on-biocl-in-humid-environment
#12
Hideyuki Okumura, Ken Adachi, Eiji Yamasue, Keiichi N Ishihara
This is the first report on photocatalytic properties of LnOCl (Ln = Sm, Nd) compounds, and the novel cocatalytic effect on BiOCl in highly humid environments, evaluated via the photoremoval of nitric oxide (NO).
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737176/room-temperature-fabrication-of-a-three-dimensional-porous-silicon-framework-inspired-by-a-polymer-foaming-process
#13
Zi Wang, Zhongyu Hou
A room-temperature routine for the fabrication of a three-dimensional silicon porous framework inspired by a polymer foaming process is introduced. The obtained micron-sized pores can be further modified by hydrothermal growth of nanowires to form a hierarchical porous composite framework.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28736785/rapid-and-ultrasensitive-detection-of-endocrine-disrupting-chemicals-using-a-nanosensor-enabled-cell-based-platform
#14
Ngoc D B Le, Xian Wang, Yingying Geng, Rui Tang, Gulen Yesilbag Tonga, Ziwen Jiang, Vincent M Rotello
Endocrine disrupting chemicals (EDCs) interact with estrogen receptors (ERs), causing a broad range of adverse health effects. Current assays for EDC activity are slow and often lack sensitivity. We report here an ultra-sensitive nanosensor that can detect estrogenic cellular changes in ER(+) MCF-7 cells rapidly (minutes) at several orders of magnitude lower than the generally used assays. Notably, the sensor responses at these ultra-low EDC levels correlated with an increased synthesis phase (S-phase) cell population of EDC-treated cells...
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28736784/a-bioorthogonal-fluorescent-probe-for-mitochondrial-hydrogen-sulfide-new-strategy-for-cancer-cell-labeling
#15
Nithya Velusamy, Anupama Binoy, Kondapa Naidu Bobba, Divya Nedungadi, Nandita Mishra, Sankarprasad Bhuniya
We report the application of a chemodosimeter 'turn on' fluorescent probe for detecting endogenous H2S formation in cancer cells. Mito-HS showed a bathochromic shift in the UV-vis-absorption spectrum from 355 nm to 395 nm in the presence of H2S. Furthermore, it showed an ∼43-fold fluorescence enhancement at λem = 450 nm in the presence of H2S (200 μM). The cancer cell-specific fluorescence imaging reveals that Mito-HS has the ability to distinguish cancer cells from normal cells based on the level of endogenous H2S formation...
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28736782/ph-responsive-de-pegylated-nanoparticles-based-on-triphenylphosphine-quercetin-self-assemblies-for-mitochondria-targeted-cancer-therapy
#16
Lei Xing, Jin-Yuan Lyu, Yue Yang, Peng-Fei Cui, Liu-Qing Gu, Jian-Bin Qiao, Yu-Jing He, Tian-Qi Zhang, Minjie Sun, Jin-Jian Lu, Xiaojun Xu, Yu Liu, Hu-Lin Jiang
We have developed mitochondria-targeted self-assembled nanoparticles (NPs) based on amphiphilic triphenylphosphine-quercetin (TPP-Que) conjugates, which were further modified by poly(ethylene glycol) via a pH-responsive coordination bond to form TQ-PEG NPs. And it is revealed that the TQ-PEG NPs were more effective therapeutic agents compared with Que in vitro and in vivo.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28736781/synthesis-and-biological-properties-of-triazole-linked-locked-nucleic-acid
#17
Vivek K Sharma, Sunil K Singh, Pranathi M Krishnamurthy, Julia F Alterman, Reka A Haraszti, Anastasia Khvorova, Ashok K Prasad, Jonathan K Watts
We have synthesized and studied the biological and biophysical properties of triazole-linked ribo and xylo locked nucleic acid (LNA). The combination of LNA with the Isobe triazole linkage gave high binding affinity when incorporated at the 3' or 5' termini of oligonucleotides, but low binding affinity at internal positions. Antisense oligonucleotides (ASOs) and siRNAs containing triazole dimers were highly active and nuclease resistant. Surprisingly, the xyloLNA-modified siRNA was the most active of the series...
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28736780/surface-initiated-synthesis-of-bulk-imprinted-magnetic-polymers-for-protein-recognition
#18
Charlotte Boitard, Anne-Laure Rollet, Christine Ménager, Nébéwia Griffete
Bulk imprinting of proteins was used combined with a grafting approach onto maghemite nanoparticles to develop a faster and simpler polymerization method for the synthesis of magnetic protein imprinted polymers with very high adsorption capacities and very strong affinity constants.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28736779/visible-light-sensitization-of-benzoyl-azides-cascade-cyclization-toward-oxindoles-via-a-non-nitrene-pathway
#19
Dattatraya B Bagal, Sung-Woo Park, Hyun-Ji Song, Sukbok Chang
Visible light sensitization of benzoyl azides was examined in reaction with N-phenylmethacrylamides to afford biologically important oxindoles and spirooxindoles via a cascade cyclization under mild reaction conditions. Mechanistic studies suggested a non-nitrene pathway, where triplet benzoyl azides act as the reactive intermediate.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28731482/radiofluorination-of-a-nhc-pf5-adduct-toward-new-probes-for-18-f-pet-imaging
#20
Boris Vabre, Kantapat Chansaenpak, Mengzhe Wang, Hui Wang, Zibo Li, François P Gabbaï
The radiofluorination of N-heterocyclic carbene (NHC) phosphorus(v) fluoride adducts has been investigated. The results show that the IMe-PF5 derivative (IMe = 1,3-dimethylimidazol-2-ylidene) undergoes a Lewis acid promoted (18)F-(19)F isotopic exchange. The resulting radiofluorinated probe is remarkably resistant to hydrolysis both in vitro as well as in vivo.
July 21, 2017: Chemical Communications: Chem Comm
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