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Chemical Communications: Chem Comm

K Kizaki, H Ozawa, T Kobayashi, R Matsuoka, Y Sakaguchi, A Fuyuhiro, T Fukuda, N Ishikawa
A new type of electronic interaction which couples two angular momenta, i.e. the angular momentum of a localized 4f system (J) and an orbital angular momentum generated in a cyclic π conjugated system by irradiation with a circularly-polarized light, has been identified in a lanthanide single molecule magnet.
May 23, 2017: Chemical Communications: Chem Comm
Hashem Shahroosvand, Saeid Abaspour, Babak Pashaei, Eros Radicchi, Filippo De Angelis, Francesco Bonaccorso
We report on the exploitation of a new tetrazole-substituted 1,10-phenanthroline and a 2,2'-bipyridine (bpy) ancillary ligand modified with an electron-donating group in cationic ruthenium complexes. This complex, placed in between two electrodes without any polymer, demonstrates high efficiency near-infrared (NIR) electroluminescence (EL). The comparison between bpy and its methyl-substituted ancillary ligand shows that the cationic Ru tetrazolate complex containing methyl groups exhibits a red shift in the EL wavelength from 620 to 800 nm compared to [Ru(bpy)3](2+) and an almost twofold reduction in the turn-on voltage, i...
May 23, 2017: Chemical Communications: Chem Comm
M F Dupont, D R MacFarlane, J M Pringle
Thermo-electrochemical cells (also called thermocells) are promising devices for harvesting waste heat for the sustainable production of energy. Research into thermocells has increased significantly in recent years, driven by advantages such as their ability to continuously convert heat into electrical energy without producing emissions or consuming materials. Until relatively recently, the commercial viability of thermocells was limited by their low power output and conversion efficiency. However, there have lately been significant advances in thermocell performance as a result of improvements to the electrode materials, electrolyte and redox chemistry and various features of the cell design...
May 23, 2017: Chemical Communications: Chem Comm
Takuma Omiya, Paolo Poli, Heike Arnolds, Rasmita Raval, Mats Persson, Yousoo Kim
The coordination of CO to metalloporphyrins changes their electronic and magnetic properties. Here we locally desorb CO molecules from a single ruthenium tetraphenylporphyrin carbonyl (CO-RuTPP) on Cu(110) using STM. The desorption is triggered by the injection of holes into the occupied states of the adsorbate using an unusual two-carrier process.
May 23, 2017: Chemical Communications: Chem Comm
Akihide Iwase, Akihiko Kudo
Ir and La-codoped BaTa2O6 was developed as a novel photocatalyst for H2 evolution utilizing visible light up to 640 nm. The Ir and La-codoped BaTa2O6 with a Ru cocatalyst functioned as an H2-evolving photocatalyst for Z-schematic water splitting under visible light irradiation upon combination with a BiVO4 O2-evolving photocatalyst and a [Co(bpy)3](3+/2+) electron mediator.
May 23, 2017: Chemical Communications: Chem Comm
Dong Yeon Kim, Jenica Marie L Madridejos, Miran Ha, Jun-Hyeong Kim, David ChangMo Yang, Chunggi Baig, Kwang S Kim
Diatomic halogen molecules X2 (X = Cl/Br) favor the edge-to-face conformation on benzene with significant electrostatic interaction via halogen bonding. In contrast, they favor the stacked conformation on graphene with negligible electrostatic interaction. As the aromatic ring expands, the inner facial side becomes almost electrostatically neutral. On coronene, the two conformations are compatible.
May 23, 2017: Chemical Communications: Chem Comm
Liubi Wu, Lulu Li, Bolong Li, Chen Zhao
A novel one-pot approach selects a hydrothermally synthesized Cu/SiO2 catalyst (consisting of Cu2O·SiO2 and Cu(0) surface species) to catalyze the reduction of a series of fatty esters, fatty acids, and coconut oil to fatty alcohols at 240 °C in methanol without extraneous hydrogen, attaining around 85% conversion and 100% selectivity.
May 23, 2017: Chemical Communications: Chem Comm
Khushbu Singh, Swati Singh, Payal Srivastava, Sri Sivakumar, Ashis K Patra
Two highly luminescent water-soluble heterometallic LnPt2 complexes, [{cis-PtCl(NH3)2}2Ln(L)(H2O)](NO3)2 (Ln = Eu (1), Tb (2)), have been designed for their selective nucleoli staining through formation of Pt-DNA crosslinks. The complexes showed significant cellular uptake and distinctive nucleoli localization through intrinsic emission from Eu(III) or Tb(III) observed through confocal fluorescence microscopy.
May 23, 2017: Chemical Communications: Chem Comm
Wei Hu, Guang-Xia Li, Jian-Jun Chen, Fu-Jin Huang, Yang Wu, Shan-Dong Yuan, Lin Zhong, Yao-Qiang Chen
A supported PdO nanocatalyst prepared by a facile in situ reduction process followed by an oxidation step showed significantly enhanced activity for the removal of pollutants from natural gas vehicles. The excellent catalytic performance is mainly due to high dispersion of the uniform PdO nanoparticles generated during the novel two-step method.
May 23, 2017: Chemical Communications: Chem Comm
R Frisenda, E Giovanelli, P Mishra, P Gant, E Flores, C Sánchez, J R Ares, D Perez de Lara, I J Ferrer, E M Pérez, A Castellanos-Gomez
Liquid-phase exfoliation is a technique capable of producing large quantities of two-dimensional materials in suspension. Despite many efforts in the optimization of the exfoliation process itself, not much has been done towards the integration of liquid-phase-exfoliated materials in working solid-state devices. In this article, we use dielectrophoresis to direct the assembly of liquid-phase-exfoliated TiS3 nanoribbons between two gold electrodes to produce photodetectors working in the visible region. Through electrical and optical measurements we characterize the responsivity of the device and we find values as large as 3...
May 23, 2017: Chemical Communications: Chem Comm
E Kozma, G Estrada Girona, G Paci, E A Lemke, P Kele
A series of double-fluorogenic siliconrhodamine probes were synthesized. These tetrazine-functionalized, membrane-permeable labels allowed site-specific bioorthogonal tagging of genetically manipulated intracellular proteins and subsequent imaging using super-resolution microscopy.
May 22, 2017: Chemical Communications: Chem Comm
Zoë Hearne, Chao-Jun Li
Conjugated (E,E)-dienals are versatile synthetic intermediates owing to their trifunctional, electrophilic nature and the prevalence of the (E,E)-diene in a wide range of functional molecules. It is shown herein that (E,E)-dienals can be readily prepared in two palladium-catalysed steps from simple, unactivated starting materials; terminal acetylenes and acrolein can be coupled via conjugate addition, followed by alkyne isomerisation. This procedure provides a highly atom-economical, redox-neutral and practical method to prepare a range of conjugated (E,E)-dienals in good yields and diastereoselectivities...
May 22, 2017: Chemical Communications: Chem Comm
Jingwei Zheng, Jiajia Ding, Dongliang Jin, Guanghua Ye, Kake Zhu, Xinggui Zhou, Weimin Yang, Weikang Yuan
Phenyltrimethoxysilane as a Si source can significantly slow down the crystallization process for SAPO-34 synthesis, leading to the formation of agglomerated nanocrystals (<100 nm). The obtained nanosized SAPO-34 shows enhanced catalytic stability in methanol-to-olefin conversion under industrially relevant conditions.
May 22, 2017: Chemical Communications: Chem Comm
Dongsong Zheng, Qiankun Zhao, Xiaoying Hu, Tanyu Cheng, Guohua Liu, Wei Wang
A chiral (mesitylene)RuCl(monosulfonated diamine) catalysed dynamic kinetic resolution (DKR)-asymmetric transfer hydrogenation (ATH) process is developed for highly enantio- (up to 99% ee) and diastereo- (up to 98 : 2 dr) selective reduction of challenging racemic α-aryl-γ-keto malononitriles. A spontaneous cyclization reaction of the hydrogenation products delivers a cascade process for efficient synthesis of useful enantioenriched 3,4-dihydro-2H-pyran-carbonitriles.
May 22, 2017: Chemical Communications: Chem Comm
V Chabert, M Hologne, O Sénèque, A Crochet, O Walker, K M Fromm
Using model peptides, each of the nine MX2H or HXnM (n = 1, 2) motifs of the silver resistance protein SilE has been shown to coordinate to one Ag(+) ion by its histidine and methionine residues with Kd in the μM range. This suggests an Ag(+) buffering role for SilE in the case of high Ag(+) overload.
May 22, 2017: Chemical Communications: Chem Comm
Mayeul Collot, Flavien Ponsot, Andrey S Klymchenko
Fluorescent calcium probes are essential tools for studying the fluctuation of calcium ions in cells. Herein, we developed Ca-NIR, the first ratiometric calcium probe emitting in the near infrared region. This probe arose from the fusion of a BAPTA chelator and a dihydroxanthene-hemicyanine fluorophore. It is efficiently excited with common 630-640 nm lasers and displays two distinct emission bands depending on the calcium concentration (Kd = ∼8 μM). The physicochemical and spectroscopic properties of Ca-NIR allowed for ratiometric imaging of calcium distribution in live cells...
May 22, 2017: Chemical Communications: Chem Comm
Yifan Chen, Yangfan Lin, Ning Du, Yaguang Zhang, Hui Zhang, Deren Yang
A novel Si/SiOx porous structure with a SiOx coating layer of varying thicknesses was prepared via a simple annealing and acid washing process. When used as an anode material for lithium-ion batteries, the Si/SiOx porous structure with an ∼9 nm SiOx coating layer demonstrates significantly improved electrochemical performance with a high reversible discharge capacity of over 915 mA h g(-1) after 500 long cycles at 1 A g(-1). The lithiation mechanism of a SiOx layer of different thicknesses has also been investigated...
May 22, 2017: Chemical Communications: Chem Comm
Guido Orlandini, Giulio Ragazzon, Valeria Zanichelli, Andrea Secchi, Serena Silvi, Margherita Venturi, Arturo Arduini, Alberto Credi
We describe the active template effect of a calix[6]arene host towards the alkylation of a complexed pyridylpyridinium guest. The acceleration of the reaction within the cavity is significant and rim-selective, enabling the efficient preparation of rotaxanes with full control of the mutual orientation of their nonsymmetric components.
May 22, 2017: Chemical Communications: Chem Comm
Christine Schies, Abraham B Alemayehu, Hugo Vazquez-Lima, Kolle E Thomas, Torsten Bruhn, Gerhard Bringmann, Abhik Ghosh
An inherently chiral metallocorrole has been resolved for the first time by means of HPLC on a chiral stationary phase. For the compound in question, a homoleptic tungsten biscorrole, the absolute configurations of the enantiomers were assigned using online HPLC-ECD measurements in conjunction with time-dependent CAM-B3LYP calculations, which provided accurate simulations of the ECD spectra.
May 22, 2017: Chemical Communications: Chem Comm
Hyo Won Lee, Myoung Ki Cho, Hye-Ri Kim, Chang Su Lim, Chulhun Kang, Hwan Myung Kim
We report an amidine-based small molecule two-photon fluorescent probe (ELP1) for monitoring vesicle transport from the ER to lysosome in live cells. Two-photon microscopy imaging studies indicated that this probe initially localized in the ER and subsequently transferred to lysosomal compartments through vesicular transport. These results may provide an effective tool for studying trafficking-related biology and pathology in real-time.
May 22, 2017: Chemical Communications: Chem Comm
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