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Chemical Communications: Chem Comm

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https://www.readbyqxmd.com/read/28933793/contribution-of-gold-nanoparticles-to-the-catalytic-dna-strand-displacement-in-leakage-reduction-and-signal-amplification
#1
Bei Wang, Xiang Zhou, Dongbao Yao, Xianbao Sun, Miao He, Xiaojing Wang, Xue Yin, Haojun Liang
A new model using a gold nanoparticle (AuNP)-DNA system to constrain leakage and improve efficiency of catalytic toehold-mediated strand displacement reactions was outlined. A 10-bp spacer on AuNPs and fourfold amount of fuels were determined for good performance of this model with an optimized toehold strategy. After the reaction at 25 °C for 10 h, a 258 pM target could be identified, which is a remarkable improvement compared with the traditional AuNP-DNA system without fuel. Moreover, this model was also studied to differentiate specific single nucleotide polymorphism on target with superior selection factors...
September 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28933468/self-assembly-of-molecular-ions-via-like-charge-ion-interactions-and-through-space-defined-organic-domains
#2
J S McNally, X P Wang, C Hoffmann, A D Wilson
Reaction stoichiometry, dynamic light scattering, and DFT are used to explore tertiary ammonium bicarbonates that exist as ideal solutes and those that self-assemble. Self-assembling tertiary amines featured organic surfaces beyond a through-space defined sphere around the charge center. Like-charge hydrogen-bonded ion pairs (or anti-electrostatic hydrogen bonding (AEHB)) also play a role in the self-assembly and provide the first evidence of this bonding motif by bicarbonate in aqueous solution. A single crystal neutron structure of a tertiary ammonium bicarbonate featuring a bicarbonate dimer is presented...
September 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28933464/highlights-from-the-faraday-discussion-on-new-directions-in-porous-crystalline-materials-edinburgh-uk-june-2017
#3
Matthew A Addicoat, Thomas D Bennett, Ivo Stassen
A lively discussion on new directions in porous crystalline materials took place in June 2017, with the beautiful city of Edinburgh as a backdrop, in the context of the unique Faraday Discussions format. Here, 5 minute presentations were given on papers which had been submitted in advance of the conference, with copious time allocated for in-depth discussion of the work presented. Prof. Mircea Dincă (MIT), chair of the scientific committee, opened the conference by welcoming the many different nationalities attending, and outlining the format of discussions...
September 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28933462/halogen-bonded-iodonium-ion-catalysis-a-route-to-%C3%AE-hydroxy-ketones-via-domino-oxidations-of-secondary-alcohols-and-aliphatic-c-h-bonds-with-high-selectivity-and-control
#4
Somraj Guha, Imran Kazi, Pranamita Mukherjee, Govindasamy Sekar
A domino synthesis of α-hydroxy ketones has been developed from benzylic secondary alcohols employing catalytic iodonium ions stabilized by DMSO. The reaction proceeds through an unprecedented sequential oxidation of alcohols to ketone and its α-hydroxylation in a controlled manner. The spectroscopic evidence establishes the possibility of formation of a stable halogen-bonded adduct between DMSO and iodonium ions.
September 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28933461/decoration-of-exfoliated-black-phosphorus-with-nickel-nanoparticles-and-its-application-in-catalysis
#5
Maria Caporali, Manuel Serrano-Ruiz, Francesca Telesio, Stefan Heun, Giuseppe Nicotra, Corrado Spinella, Maurizio Peruzzini
Nickel nanoparticles were dispersed on the surface of exfoliated black phosphorus and the resulting nanohybrid Ni/2DBP showed an improved stability with respect to pristine 2D BP when kept under ambient conditions in the dark. Ni/2DBP was applied as a catalyst in the semihydrogenation of phenylacetylene and exhibited high conversion and selectivity towards styrene. These features were preserved after recycling tests revealing the high stability of the nanohybrid.
September 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28933460/tpz-a-bright-centrosymmetric-two-photon-scaffold-for-bioimaging
#6
Zuhai Lei, Ping Yue, Xueli Wang, Xinran Li, Yi Li, Haihong He, Xiao Luo, Xiangming Meng, Jinquan Chen, Xuhong Qian, Youjun Yang
The development of biocompatible two-photon fluorophores with a large absorption cross-section is challenging, despite the presence of theoretical guidelines. By rendering asymmetric PRODAN dye centrosymmetric, we designed and synthesized a novel class of two-photon fluorophores (TPZ). Their photophysical properties were investigated and their imaging potentials in cells, tissues and zebrafish were showcased.
September 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28932854/salen-co-iii-imprisoned-within-pores-of-a-metal-organic-framework-by-post-synthetic-modification-and-its-asymmetric-catalysis-for-co2-fixation-at-room-temperature
#7
Danping Chen, Ran Luo, Meiyan Li, Mengqi Wen, Yan Li, Chao Chen, Ning Zhang
Herein, a new preparation strategy of chiral metal-organic frameworks (CMOFs) has been demonstrated. By adsorption and then post-synthetically modified (PSM) procedures, chiral salen(Co(iii)) could be imprisoned within the cages of an MOF and remained in its free form. This is the first report on the successful application of CMOFs in heterogeneous asymmetric catalysis for coupling CO2 with epoxides to obtain optically active cyclic carbonates at room temperature.
September 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28930310/lipid-radicals-cause-light-induced-retinal-degeneration
#8
Masataka Enoki, Saki Shinto, Yuta Matsuoka, Ayasa Otsuka, Sachiko Kaidzu, Masaki Tanito, Takahiro Shibata, Koji Uchida, Akihiro Ohira, Mayumi Yamato, Ken-Ichi Yamada
Age-related macular degeneration (AMD) is the leading cause of blindness worldwide. Although the cause of AMD remains unknown, lipid peroxidation (LPO) end-products are critical molecules for its development. Herein, we report the imaging of lipid radicals, which are key factors in the LPO reaction, and therapeutic information using animal models.
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28930307/a-highly-enantioselective-asymmetric-darzens-reaction-catalysed-by-proline-based-efficient-organocatalysts-for-the-synthesis-of-di-and-tri-substituted-epoxides
#9
Veeramanoharan Ashokkumar, Ayyanar Siva, R Ramaswamy Chidambaram
A new class of easily available and readily tunable proline based chiral organocatalysts was found to efficiently catalyse an unprecedented highly enantioselective asymmetric Darzens reaction of α-chloroketones and substituted α-chloroketones with various aldehydes, which directly produces optically active di- and tri-substituted chiral epoxides with higher product yields (up to 97%) and excellent ee's (up to 99%) under mild reaction conditions.
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28929160/two-synthetic-approaches-for-the-preparation-of-tin-ii-dications
#10
Mario Schleep, Clarissa Hettich, Daniel Kratzert, Harald Scherer, Ingo Krossing
Examples of tin dications without closer contacts to the anion are rare, as are straightforward routes to weakly coordinated tin(ii) dication salts. Here we report on the synthesis of [Sn(MeCN)6][Al(OR(F))4]2 (R(F) = C(CF3)3) via NO(+)-oxidation of tin metal. Subsequently, [Sn(MeCN)6][Al(OR(F))4]2 was used to prepare the mixed coordinated [Sn(pyr)2(MeCN)4][Al(OR(F))4]2 and [Sn(PPh3)2-(MeCN)5][Al(OR(F))4]2·MeCN. Additionally, [Sn(dmap)4][Al(OR(F))4]2 was prepared via a reaction of dmap with [SnCp][Al(OR(F))4]...
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28929157/well-defined-multiblock-poly-vinylidene-fluoride-and-block-copolymers-thereof-a-missing-piece-of-the-architecture-puzzle
#11
Sanjib Banerjee, Yogesh Patil, Olinda Gimello, Bruno Ameduri
Unprecedented synthesis of multiblock poly(vinylidene fluoride) (PVDF, up to 16 300 g mol(-1)) with narrow-dispersity blocks (Đ = 1.26) mediated by a fluorinated cyclic xanthate via reversible addition-fragmentation chain transfer (RAFT) polymerization is reported. The as-synthesized multiblock PVDF was employed as a macroRAFT agent to prepare valuable multiblock copolymers with potential applications in emerging areas.
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28929155/a-vitamin-b12-derivative-catalyzed-electrochemical-trifluoromethylation-and-perfluoroalkylation-of-arenes-and-heteroarenes-in-organic-media
#12
Md Jakir Hossain, Toshikazu Ono, Kosuke Wakiya, Yoshio Hisaeda
The electrochemical trifluoromethylation and perfluoroalkylation of aromatic compounds mediated by a vitamin B12 derivative as a cobalt-based catalyst has been developed. The Co(i) species of a vitamin B12 derivative, prepared by controlled-potential electrolysis at -0.8 V vs. Ag/AgCl in methanol, reacted with RfI (Rf = CF3, n-C3F7, n-C4F9, n-C8F17, and n-C10F21) to form a Co-Rf complex. This complex released an Rf radical under visible light irradiation, which then reacted directly with non-activated (hetero)arenes to form the desired fluoroalkylated molecules through direct C-H functionalization...
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28929153/two-dimensional-metal-organic-frameworks-with-high-oxidation-states-for-efficient-electrocatalytic-urea-oxidation
#13
Dongdong Zhu, Chunxian Guo, Jinlong Liu, Liang Wang, Yi Du, Shi-Zhang Qiao
A two-dimensional metal-organic framework (MOF) comprising nickel species and an organic ligand of benzenedicarboxylic acid is fabricated and explored as an electrocatalyst for urea oxidation reaction (UOR). The excellent UOR performance is found to be partially due to the high active site density of the two-dimensional MOF, and largely because of the high oxidation state of the nickel species.
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28929145/enhanced-detection-of-explosives-by-turn-on-resonance-raman-upon-host-guest-complexation-in-solution-and-the-solid-state
#14
Edward H Witlicki, Steffen Bähring, Carsten Johnsen, Marta V Solano, Kent A Nielsen, Daniel W Silverstein, Craig W Marlatt, Lasse Jensen, Jan O Jeppesen, Amar H Flood
The recognition of nitroaromatic explosives by a tetrakis-tetrathiafulvalene-calix[4]pyrrole receptor (TTF-C[4]P) yields a "turn on" and fingerprinting response in the resonance Raman scattering observed in solution and the solid state. Intensity changes in nitro vibrations with analyte complexation occur via a mechanism of resonance between the 785 nm laser line and the strongly absorbing charge-transfer chromophore arising from the complex between electron-donating TTF-C[4]P and electron-accepting nitroaromatic explosives...
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28929142/enhanced-cellular-uptake-and-tumor-penetration-of-nanoparticles-by-imprinting-the-hidden-part-of-membrane-receptors-for-targeted-drug-delivery
#15
Shan Peng, Yahua Wang, Na Li, Chong Li
The widely existing transmembrane helices can serve as a novel type of binding site for recognizing corresponding membrane receptors. Through imprinting the transmembrane domain of certain receptors, here we report the construction of polymeric nanoparticles which can achieve enhanced cellular uptake and permeability in target tissues for tumor-targeted drug delivery.
September 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926054/efficient-incorporation-of-diverse-components-into-metal-organic-frameworks-via-metal-phenolic-networks
#16
Yangke Long, Ling Xiao, Qihua Cao, Xiaowen Shi, Yunan Wang
Metal phenolic networks (MPNs) were used for the first time for the construction of core@shell MOF materials. Diverse functional nanocores with different shapes and sizes could be coated with ZIF-8 shells mediated by MPNs. The obtained Fe3O4@TA-Fe(3+)@ZIF-8 powder showed a superhydrophobic nature which could efficiently absorb n-hexane from water.
September 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926053/catalytic-domino-amination-and-oxidative-coupling-of-gold-acetylides-and-isolation-of-key-vinylene-digold-intermediates-as-a-new-class-of-ditopic-n-heterocyclic-carbene-complexes
#17
Haifeng Chen, Jiwei Wang, Zejun Hu, Sheng Xu, Min Shi, Jun Zhang
A catalytic domino amination and oxidative coupling of in situ prepared gold acetylides has been developed for the synthesis of abnormal NHC (aNHC) gold complexes, and key vinylene digold intermediates are isolated and structurally characterized.
September 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926051/intensely-luminescent-gold-i-phosphinopyridyl-clusters-visualization-of-unsupported-aurophilic-interactions-in-solution
#18
Zhen Lei, Jin-Yuan Zhang, Zong-Jie Guan, Quan-Ming Wang
Gold(i) phosphinopyridyl clusters [Au9(PNC)6](BF4)3 (1) and [Au11(PNC)6(PPh3)2](BF4)5 (2) (PNC = 2-diphenylphosphinopyridyl monoion) are assembled. In contrast to the green luminescence of 1, 2 is brightly orange emissive in CH2Cl2, which shows the presence of unsupported Au(I)-Au(I) interactions in solution. Besides, 1 and 2 can selectively light up the mitochondria of living cells.
September 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926049/one-pot-synthesis-of-multicomponent-mo-co-metal-sulfide-carbon-nanoboxes-as-anode-materials-for-improving-na-ion-storage
#19
Juan Xiang, Taeseup Song
Multicomponent MoS2/Co9S8/C hollow nanocubes were developed by the one-pot solvothermal method and a subsequent calcination process. Benefitting from the merits of hollow structures, the highly-conductive carbon matrix and the buffering effect provided by uniformly-mixed MoS2 and Co9S8, the MoS2/Co9S8/C anode shows high capacity and rate capability as the anode of sodium-ion batteries.
September 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28926048/a-new-pu-iii-coordination-geometry-in-c5h5nbr-2-pucl3-h2o-5-%C3%A2-2cl%C3%A2-2h2o-as-obtained-via-supramolecular-assembly-in-aqueous-high-chloride-media
#20
Robert G Surbella, Lucas C Ducati, Kristi L Pellegrini, Bruce K McNamara, Jochen Autschbach, Jon M Schwantes, Christopher L Cahill
Crystals of a hydrated Pu(iii) chloride, (C5H5NBr)2[PuCl3(H2O)5]·2Cl·2H2O, were grown via slow evaporation from acidic aqueous, high chloride media. X-ray diffraction data reveals the neutral [PuCl3(H2O)5] tecton is assembled via charge assisted hydrogen and halogen bonds donated by 4-bromopyridinium cations and a series of inter-tecton hydrogen bonds.
September 19, 2017: Chemical Communications: Chem Comm
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