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Chemistry, An Asian Journal

Ya Guo, Tianjun Sun, Yiming Gu, Xiaowei Liu, Quanli Ke, Shudong Wang
Zeolite FAU with tunable SiO₂/Al₂O₃ molar ratio has been successfully synthesized in the absence of organic structure-directing agents (OSDA). Specifically, the addition of zinc species contributes to the feasible and effective adjustment of the framework SiO₂/Al₂O₃ molar ratio between ca. 4 and ca. 6 depending on the amount of zinc species added in the batch composition. In contrast, typical OSDA such as tetramethylammonium hydroxide (TMAOH) has a limited effect on the SiO₂/Al₂O₃ molar ratio of the zeolite...
March 15, 2018: Chemistry, An Asian Journal
Xiaojun Wang, Chang Gu, Hongzhi Zheng, Yu-Mo Zhang, Sean Xiao-An Zhang
A multi-state and multi-stimuli-responsive oxazine molecular switch combining electro-base property and sensitively base/acid responsive properties was designed and synthesized. The multi-state structures of the molecular switch with different colors were speculated by comparison the optical properties with reference molecules and confirmed by NMR. The color switching mechanism under the stimulation of acid and base was investigated by DFT calculation. Three single states can be obtained and the switching is unidirectional under the stimulation of acid and base...
March 15, 2018: Chemistry, An Asian Journal
Jing Zhang, Xitao Liu, Xianfeng Li, Shiguo Han, Kewen Tao, Yuyin Wang, Chengmin Ji, Zhihua Sun, Junhua Luo
Organic-inorganic hybrid perovskites, with the formula ABX3 (A=organic cation, B=metal cation, and X=halide; for example, CH3 NH3 PbI3 ), have diverse and intriguing physical properties, such as semiconduction, phase transitions, and optical properties. Herein, a new ABX3 -type semiconducting perovskite-like hybrid, (hexamethyleneimine)PbBr3 (1), consisting of one-dimensional inorganic frameworks and cyclic organic cations, is reported. Notably, the inorganic moiety of 1 adopts a perovskite-like architecture and forms infinite columns composed of face-sharing PbBr6 octahedra...
March 15, 2018: Chemistry, An Asian Journal
Shuli You, Wen Shao, Ye Wang, Ze-Peng Yang, Xiao Zhang
Copper-catalyzed intermolecular asymmetric propargylic alkylation of 4-hydroxypyridines has been realized for the first time. In the presence of Cu complex derived from Pybox ligand, the N-propargylated 4-pyridones were obtained under mild reaction conditions with up to 99% yield and 95% ee. The Pybox ligand bearing 4-F-phenyl substituent plays a key role for the high enantioselectivity. The products can be easily transformed to the core structure of quinolizidine alkaloids.
March 15, 2018: Chemistry, An Asian Journal
Shenglin Jin, Jie Liu, Jainyong Lv, Shuwang Wu, Jianjun Wang
The design and fabrication of interfacial materials for anti-icing are of great importance, since undesired ice accumulation leads to serious issues in economic, energy and safety. Substantial progresses on interfacial materials for the passive removal of ice have been achieved in the past three years. The present focus review critically summarizes and analyzes recent breakthrough in interfacial materials for anti-icing. In particular, we focus on the effect of surface textures on timely removal of water droplet, microscopic mechanism of ice formation and the effect of interfacial layer's properties on easy shedding off formed ice towards the design of high-performance and durable interfacial materials for anti-icing beyond superhydrophobic materials...
March 13, 2018: Chemistry, An Asian Journal
Yuuki Komoto, Yasuomi Yamazaki, Yusuke Tamaki, Madoka Iwane, Tomoaki Nishino, Osamu Ishitani, Manabu Kiguchi, Shintaro Fujii
Single molecular junctions have been of particular interest in molecular electronics. To realize molecular electronic devices, it is crucial that functional single molecular junctions are connected each other using joint units on the atomic scale. However, the good joint units are not reported because controlling the charge transport directions through the junctions is not trivial. Here we report the joint unit that control and change charge transport directions through the junctions, by using Ruthenium-tris-bipyridine (RuBpy) complex...
March 12, 2018: Chemistry, An Asian Journal
Wenzhuo Wu, Cong Wei, Xiangcheng Lin, Qun Xu
As a promising non-precious metal photoelectrochemical (PEC) catalyst, MoS2 exhibits high electrocatalytic activity and stability, while the weak light absorption efficiency and low photoresponse current limit its practical application. Herein, a facile coassembly approach was proposed to construct the porphyrin-MoS2 composite photoelectrocatalysts. The as-prepared photoelectro-catalysts show significantly enhanced photocurrent response as high as 16 μA cm-2, which is about 2 times higher than that of bare MoS2...
March 12, 2018: Chemistry, An Asian Journal
Ruipeng Ren, Jing Ren, Yongkang Lv
Carbon nanomaterials, especially graphene and carbon nanotube, with high specific surface area, electrical conductivity and excellent mechanical flexibility have been considered as favorable alternatives to graphite anodes in Li-ion batteries. However, the limited Li ion storage sites within the sp2 carbon hexahedrons leads to the low storage capacity. Thus, the rational structure design is essential to prepare the high performance carbon-based anode materials. Here, we have used flexible single-wall carbon nanotubes (SWCNT) with ultra-high electrical conductivity to wrap the three-dimensional graphene foam (GF) by a facile dip-coating process to form the binary network structure...
March 10, 2018: Chemistry, An Asian Journal
Katsuhiko Ariga, Taizo Mori, Waka Nakanishi
In 2016, the Nobel Prize in Chemistry was awarded for pioneering work of molecular machines. Half a year later in Touluse, a world-wide nanocar race competition was held as the first molecular car race using the tip of scanning tunneling microscope as an electrical remote control. We are on the trek at the current frontier of research, nanospace with molecular machines and nanocars. In this short review, we focus on current frontier research in molecular machines at interfaces. In the first part, the science behind the nanocar race is shortly explained, which is followed by some recent research examples on controls of molecules at surfaces...
March 9, 2018: Chemistry, An Asian Journal
Madoka Yamaguchi, Kazuo Tanaka, Yoshiki Chujo
Introduction of heavy atoms often induces red shift in the emission spectra with conjugated molecules. Conversely, we report here the blue-shifting effect on the absorption and emission band by employing a heavier atom in the same element group based on the conjugated organic dye. The boron complexes having the oxygen- and sulfur-bridged structures in the ligand moiety were synthesized, and their optical properties were compared. It was observed that significant optical bands were observed in the shorter wavelength region from the sulfur-bridged complex than those from the oxygen one in the absorption and luminescence spectra...
March 8, 2018: Chemistry, An Asian Journal
Tomoki Yoneda, Daiki Mori, Tyuji Hoshino, Saburo Neya
A meso-aryl and β-alkyl substituted new sapphyrin 1 and its rhodium(I) and silver complexes were synthesized. Sapphyrin 1 was so stable that the non-inverted and warped structure could be analyzed by X-ray crystallography even in its neutral state. The bis-rhodium(I) comlex 1Rh2 has a more planar structure than 1 with enhanced aromaticity over the conjugation circuit. On the other hand, silver metalation into 1 caused a marked core rearrangement into neo-confused sapphyrin 1Ag with a C(α)-N bond and a twisted macrocycle...
March 7, 2018: Chemistry, An Asian Journal
Cancan Wang, Dan Xu, Juewen Zhang, Muzi Chen, Feng Yan, Jiangna Guo
This study describes a self-doping and additive-free strategy for the synthesis of metal-nitrogen-doped porous carbon materials (CMs) via carbonizing the well-tailored precursors, metal-containing ionic liquids (M-ILs). The organic skeleton in M-ILs serves as both carbon and nitrogen sources, while metal ions acts as porogen and metallic dopants. High nitrogen content, appropriate content of metallic species and hierarchical porosity synergistically possess the resultant CMs (MIBA-M-T) effective electrocatalysts for oxygen reduction reaction (ORR)...
March 7, 2018: Chemistry, An Asian Journal
Cheng-Xing Cui, Chunhui Shan, Yu-Ping Zhang, Xiao-Lan Chen, Ling-Bo Qu, Yu Lan
Organocatalysis has emerged as an effective strategy for chemical synthesis. Within this area, phosphine-catalyzed coupling reactions have attracted considerable attention because of their versatility and wide range of applications in the construction of new C-C bonds. Recently, various experimental studies on phosphine-catalyzed coupling reaction of allenes have been reported, and mechanistic and computational studies have also progressed considerably. As a nucleophile, phosphine can react with allene to form a zwitterionic phosphoniopropenide intermediate...
March 7, 2018: Chemistry, An Asian Journal
Bo Jiang, Xiao-Tong Zhu, Tian-Shu Zhang, Qi Zhao, Pei-Jun Cai, Wen-Juan Hao, Shu-Jiang Tu
A new sulfinate salt-mediated radical relay for the completion of C(sp3)-H bond indenylation of cyclic ethers with readily available 2-alkynylbenzonitriles by combining silver/tert-butyl peroxide (TBHP) was established, providing a wide range of 3-alkylated 1-indenones with generally good yields. Interestingly, the current reaction system can tolerate two different S-centered radical and C-centered radical in a one pot, in which S-centered radical promoted the formation C-centered radical to induce the radical cascades without disturbing the reaction process...
March 7, 2018: Chemistry, An Asian Journal
Hua-Jin Zhai, Rui Li, Xue-Rui You, Kang Wang
Bowl-shaped C6v B36 cluster with a central hexagon hole is considered an ideal molecular model for low-dimensional boron-based nanosystems. Owing to electron-deficiency of boron, chemical bonding in B36 cluster is intriguing and complicated and has remained elusive despite a couple of papers in literature. Herein we shall offer an in-depth bonding analysis via canonical molecular orbitals (CMOs) and adaptive natural density partitioning (AdNDP), further aided with natural bond orbital (NBO) analysis and orbital composition calculations...
March 7, 2018: Chemistry, An Asian Journal
Hiroki Sawada, Masamichi Yamanaka
The successful development of stiff supramolecular gels is an important goal toward their practical application. One approach to stiffen supramolecular gels is to introduce covalent cross-link. The bis-urea dimer 2, having a structure similar to that of the low-molecular-weight gelator 1, was synthesized. Supramolecular hydrogels were formed from mixtures of 1 and 2 in appropriate ratios, with 2 acting as a covalent cross-linker to connect the fibrous aggregates formed by the self-assembly of 1. The introduction of these covalent cross-links greatly influenced the dynamic viscoelasticity of the supramolecular hydrogels...
March 7, 2018: Chemistry, An Asian Journal
Robert Häner, Hao Yu, Mattia Sabetti
The assembly of supramolecular polymers from a phosphodiester-linked dimeric anthracene is described. AFM and TEM images reveal that the supramolecular polymers self-assemble into nanotubes in water. Subsequent photodimerization experiments indicate that the supramolecular polymerization occurs via end-to-end stacking rather than an interdigitation arrangement of the building blocks.
March 7, 2018: Chemistry, An Asian Journal
Yingchun Yang, Shuai Hao, Ninghua Chen, Qin Liu, Ying Xie, Honggang Fu
Cost-effective and high-efficient electrocatalysts for the oxygen evolution reaction are crucial for electrolytic hydrogen production. In this communication, we report core-shell NiO@Ni-P nanosheet array as a high-performance 3D catalyst for water oxidation electrocatalysis. Such nanoarray demands overpotentials of 292 and 350 mV to drive geometrical catalytic current densities of 10 and 100 mA cm-2, respectively, with much superior activity to its NiO and Ni-P counterparts. Notably, this catalyst also shows high long-term electrochemical durability with Faradaic efficiency of 98...
March 6, 2018: Chemistry, An Asian Journal
Darshika Wanigarathna, Jiajian Gao, Bin Liu
Fluorocarbon has important applications in industry, but is environmentally unfriendly, which can cause ozone depletion and contribute to the global warming with long atmospheric lifetime and high global warming potential. In this work, the metal-organic framework UiO-66(Zr) is demonstrated to have excellent performance characteristics to separate fluorocarbon mixtures at room temperature. Adsorption isotherm measurements of UiO-66(Zr) display high fluorocarbon sorption uptakes of 5.0 mmol g-1 for R22 (CHClF2), 4...
March 6, 2018: Chemistry, An Asian Journal
Lingyun Wang, Fuyong Wu, Hao Tang, Derong Cao, Xiaofang Jiang
Two diketopyrrolopyrrole derivatives (DPP1 and DPP2) are utilized for generating multiple luminescent colors (yellow-orange-red-deep red) in solution, nanoparticle, aggregate and solid states through AIE coupled ESIPT process. They are potentially useful for bioimaging due to its good biocompatibility and large Stoke shifts.
March 5, 2018: Chemistry, An Asian Journal
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