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Chemistry, An Asian Journal

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https://www.readbyqxmd.com/read/29356387/-18-crown-6-k-fe-1-cl-1-4-0-5-fe-2-cl-2-4-0-5-a-multifunctional-molecular-switch-of-dielectric-conductivity-and-magnetism
#1
Yuan-Bo Tong, Zheng-Fang Tian, Hai-Bao Duan, Zhong-Peng Zhu, Wei He, Tian-Yu Hong, Gui Yu, Yu-Jian He, Jing-Kui Yang
Multifunctional materials that exhibit different physical properties in a single phase have potential for use in multifunctional devices. Herein, we reported an organic-inorganic hybrid compound [(18-crown-6)K][Fe(1)Cl(1)4]0.5[Fe(2)Cl(2)4]0.5 (1) by incorporating KCl and FeCl3 into the 18-crown-6 molecular which acts as a host of the six O atoms affording lone-pair electrons to anchor the guest potassium cation, and [FeCl4]- as a counter ion for charge balance to construct a complex salt. This salt exhibited a one-step reversible structural transformation to give two separate high and low temperature phases at 373 K, which was confirmed by systematic characterizations including differential scanning calorimetry (DSC) measurements, variable-temperature structural analyses, and dielectric, impedance, variable-temperature magnetic susceptibility measurements...
January 22, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29349866/amorphous-materials-for-enhanced-localized-surface-plasmon-resonances
#2
Chuanhui Zhu, Qun Xu
The discovery of localized surface plasmon resonances (LSPR) in semiconductor nanocrystals has initiated a new field in plasmonics. And plasmonic nanocrystals of crystal materials have gained rapid development in the past years with a class of materials with unique photoelectronic properties. Present now a growing number of amorphous plasmonic materials are steadily capturing scientific interest of people, though only a few are well-characterized. Here, we focus on the recent development in state-of-the art experiments, and explore the vast library of plasmonic properties in amorphous materials, including their application fields and optical spectral range...
January 19, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29345861/ruthenium-catalyzed-aerobic-oxidation-of-amines
#3
Debabrata Maiti, Goutam Kumar Lahiri, Ritwika Ray, Arijit Singha Hazari
Amine oxidation is one of the fundamental reactions in organic synthesis since it leads to a variety of value-added products like oximes, nitriles, imines and amides among many others. These products comprise the key N-containing building blocks in modern chemical industry, and such transformations when achieved in presence of molecular oxygen without using stoichiometric oxidants, are much preferred since they circumvent the production of unwanted wastes. In parallel, versatility of ruthenium catalysts in various oxidative transformations is well-documented...
January 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29345854/-ch3nh3-4ga4sbs9s0-28o0-72h-a-three-dimensionally-open-framework-heterometallic-chalcogenidoantimonate-exhibiting-ni2-ion-exchange-property
#4
Bo Zhang, Wei-An Li, Yi-Yu Liao, Chen Zhang, Mei-Ling Feng, Xiao-Ying Huang
An open-framework chalcogenidoantimonate, namely, [CH3NH3]4Ga4SbS9S0.28O0.72H (1), has been solvothermally synthesized and structurally characterized. Interestingly, 1 showed Ni2+ ion-exchange properties and wide pH resistance, with a maximum exchange capacity of 76.9 mg/g. To the best of our knowledge, this is the first example of amine-directed three-dimensional (3D) heterometallic chalcogenidometalates for the highly selective Ni2+ ion capture with the high distribution coefficient (Kd = 1.65 × 105 mL/g)...
January 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29345421/synthesis-of-histidine-containing-oligopeptides-via-histidine-promoted-peptide-ligation
#5
Kai-Jin Huang, Yi-Chen Huang, Yuya Angel Lin
Histidine-containing peptides are valuable therapeutic agents for treatment of neurodegenerative diseases. However, the synthesis of histidine-containing peptides is not trivial due to the potential of imidazole sidechain of histidine to act as a nucleophile if unprotected. A peptide ligation method utilizing the imidazole sidechain of histidine has been developed. The key imidazolate intermediate that acts as an internal acyl transfer catalyst during ligation is generated by deprotonation. Transesterification with amino acids or peptides tethered with C-terminal thioester followed by N to N acyl shifts led to the final ligated products...
January 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29345418/welcome-to-the-new-editorial-board-members
#6
EDITORIAL
(no author information available yet)
We warmly welcome our new Editorial Board members Matthias Bickelhaupt, Sally Brooker, Xiaoming Feng, Mikiko Sodeoka, and Takafumi Ueno.
January 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29345104/a-self-growing-strategy-for-large-scale-crystal-assembly-tubes
#7
Huizeng Li, Mingzhu Li, Qiang Yang, Xiaoli Sun, Bo Guan, Yanlin Song
Assembled tubular materials have attracted widespread attention due to their potential applications in catalysis, bionics, and optic-electronics. Many versatile methods, including template-assistance and self-assembly, have been developed for tubular materials fabrication. Here we demonstrate a self-growing strategy to prepare large-scale crystal assembly tubes. Addition of the template and the need for the sophisticated equipment are avoided with this method. The sidewall of the tubes composes of a layer of polyhedral crystals that are connected together through grain coalescence...
January 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29345067/supramolecular-gels-derived-from-the-salts-of-variously-substituted-phenylacetic-acid-and-dicyclohexyl-amine-design-synthesis-structures-and-dye-adsorption
#8
Parthasarathi Dastidar, Rajdip Roy, Tapas Kumar Adalder
A well-studied supramolecular synthon namely secondary ammonium monocarboxylate (SAM) was exploited to generate a new series of organic salts derived from variously substituted phenylacetic acid (PA) and dicyclohexyl amine (DCA) as potential low molecular weight gelators (LMWGs). As much as 25% of the SAM salts under study were gelators. The gels were characterized by rheology and the morphology of the gel networks was studied by high resolution electron microscopy. Single crystal and powder X-ray diffraction data were employed to study structure-property (gelation) correlation...
January 18, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29342324/different-atomic-terminations-associated-photocatalytic-nitrogen-fixation-of-bismuth-oxybromide-a-first-principles-study
#9
Hongxian Liu, Zhenxing Fang, Yongfei Su, Yuanli Suo, Shuping Huang, Yongfan Zhang, Kaining Ding
We have systematically investigated the electronic structures and activation capacities of BiOBr {001} facets with different atomic terminations by means of DFT methods. Our calculations reveal that oxygen vacancies (OVs) give a significant boost in band edges of the O-terminated BiOBr {001} facets, and excess electrons induced by OVs could exceed the reduction potentials of high-energy N2 intermediates. Interestingly, the Bi-terminated BiOBr {001} facets may be good candidates for photocatalytic nitrogen fixation due to the stronger activation ability of N2 molecules comparing with O-terminated BiOBr {001} facets with OVs...
January 17, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29341435/bifunctional-fluorescent-probe-for-sequential-sensing-thiols-and-primary-aliphatic-amines-in-distinct-fluorescence-channels
#10
Lingliang Long, Meiyu Huang, Ning Wang, Xiangqi Yuan, Siyu Cao, Aihua Gong, Kun Wang
Thiols and primary aliphatic amines (PAA) are ubiquitous and extremely important species in biological system. They have performed significant interplaying roles in complex biological events. A single fluorescent probe differentiating both thiol and PAA can contribute to understanding the intrinsic inter-relationship of thiols and PAA in biological processes. Herein, we rationally constructed the first fluorescent probe that can respond to thiols and PAA in different fluorescence channels. The probe exhibited high selectivity and sensitivity to thiols and PAA...
January 17, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29337436/integrating-tempo-or-its-analogues-with-visible-light-photocatalysis
#11
Xianjun Lang, Jincai Zhao
Visible light has risen to be a very important facilitator for selective radical reactions enabled by well-cognized photocatalysts. The renaissance of visible light photocatalysis on this matter partly relies on integrating it with other area of catalysis. In parallel, TEMPO, a quintessential persistent radical, has a wide range of uses due to its exceptional redox behavior, giving rise to its latest prominence in catalysis. Therefore, integrating the catalysis of TEMPO with photocatalysis to carry out visible light-induced selective reactions becomes very convenient marriage of merits...
January 16, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29336528/synthesis-of-functionalized-%C3%AE-5-indenyl-rhodium-iii-complexes-and-their-application-to-c-h-bond-functionalization
#12
Jyunichi Terasawa, Yu Shibata, Yuki Kimura, Ken Tanaka
It has been established that reductive complexation of functionalized benzofulvenes, which are readily prepared from commercially available indene and 2-methylindene, with RhCl3 in ethanol affords the corresponding indenyl-rhodium(III) dichlorides bearing substituents at the 1- (H or CO2Et), 2- (H or Me), and 3- [CH2Ph or CH2(2-MeOC6H4)] positions. The thus obtained indenyl-rhodium(III) complexes bearing one ethoxycarbonyl group showed higher thermal stability and regioselectivity than our previously reported CpERhIII complex toward the oxidative [3+2] annulation of acetanilides with internal alkynes...
January 16, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29336117/prussian-blue-derived-fep-nanoparticles-in-porous-graphene-aerogel-as-efficient-electrocatalysts-for-hydrogen-evolution-reaction
#13
Narendra Kumar Alam Venugopal, Shuli Yin, Yinghao Li, Hairong Xue, You Xu, Xiaonian Li, Hongjing Wang, Liang Wang
Tailoring of new hydrogen evolution reaction (HER) electrocatalyst with earth abundant elements is important for large scale water splitting and hydrogen production. In this work, we present a simple synthetic method for incorporating iron phosphide (FeP) particles into three-dimensional (3D) porous graphene aerogel (GA) structure. The FeP formed in porous 3D GA (FeP/GA) is derived from electroactive Fe hexacyanoferrate (FeHCF). The advantage of incorporating FeP, in the porous 3D graphene network enables high accessibility for HER...
January 16, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29333699/pomegranate-structured-silica-sulfur-composite-cathodes-for-high-performance-lithium-sulfur-batteries
#14
Soojin Park, Sinho Choi, Dawei Su, Myoungsoo Shin, Guoxiu Wang
Porous materials have many structural advantages for energy storage and conversion devices such as rechargeable batteries, supercapacitors, and fuel cells. When applied as a host material in lithium-sulfur batteries, porous silica materials with a pomegranate-like architecture can not only act as a buffer matrix for accommodating a large volume change of sulfur, but also suppress the polysulfide shuttle effect. The porous silica/sulfur composite cathodes exhibit excellent electrochemical performances including a high specific capacity of 1450 mA h g-1, a reversible capacity of 82...
January 14, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29331094/solvent-impedes-co2-cycloaddition-on-metal-organic-frameworks
#15
Dan Shao, Jinbiao Shi, Jianling Zhang, Xiuniang Tan, Tian Luo, Xiuyan Cheng, Bingxing Zhang, Buxing Han
The catalytic performance of metal-organic frameworks (MOFs) for the synthesis of cyclic carbonate from carbon dioxide and epoxides has been explored in solvent and solvent-free conditions, respectively. It was found that MOF catalysts have significantly improved catalytic activities in solvent-free CO2 cycloaddition reactions than those in solvent. The mechanism was discussed from the competition of solvent with substrate to adhere MOF catalysts during reaction process.
January 13, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29330925/in-situ-growth-of-mno2-nanosheets-on-n-doped-carbon-nanotubes-derived-from-polypyrrole-tubes-for-supercapacitors
#16
Xu Ou, Qi Li, Dan Xu, Jiangna Guo, Feng Yan
Nitrogen-doped porous carbon nanotubes@MnO2 (N-CNTs@MnO2) nanocomposites are prepared through the in situ growth of MnO2 nanosheets on N-CNTs derived from polypyrrole nanotubes (PNTs). Benefiting from the synergistic effects between N-CNTs (high conductivity and N doping level) and MnO2 nanosheets (high theoretical capacity), the as-prepared N-CNTs@MnO2-800 nanocomposites show a specific capacitance of 219 F g-1 at a current density of 1.0 A g-1, which is higher than that of pure MnO2 nanosheets (128 F g-1) and PNTs (42 F g-1) in 0...
January 13, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29328555/syntheses-and-properties-of-meso-substituted-porphyrin-mesogens-with-triazole-linkages-and-peripheral-alkyl-chains
#17
Ruilin Zhang, Hongfei Gao, Yanming Ren, Yulong Xiao, Jinliang Hu, Xiaohong Cheng
Novel discotic mesogens P/n-M (n = 12, 16, 18, M = 2H, Zn and Cu) bearing a porphyrin core, triazole linkages and peripheral 3,4,5-trialkoxybenzyl units have been synthesized by "click chemistry" approach. The thermal behavior, photophysical properties and morphologies of these compounds were investigated by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), UV and PL spectra, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). These compounds can self-assemble into hexagonal columnar phases in their pure states and form organogels in 1,4-dioxane with unusually flower-like sphere morphology...
January 12, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29328550/synthesis-of-hollow-mesoporous-tio2-microspheres-with-single-and-double-au-nanoparticles-layers-for-enhanced-visible-light-photocatalysis
#18
Zia Ur Rahman, Ning Wei, Yange Feng, Xiaolong Zhang, Daoai Wang
A facile method was used to prepare hollow mesoporous TiO2 and Au@TiO2 spheres using polystyrene (PS) templates. Au nanoparticles (NPs) were simultaneously synthesized and attached on the surface of PS spheres by reducing AuCl4- ions using sodium citrate which resulted in the uniform deposition of Au NPs. The outer coating of titania via sol-gel produced PS@Au@TiO2 core-shell spheres. Removing the templates from these core-shell spheres through calcination produced hollow mesoporous and crystalline Au@TiO2 spheres with Au NPs inside the TiO2 shell in a single step...
January 12, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29328548/copper-catalyzed-oxidative-reaction-of-%C3%AE-keto-sulfones-with-alcohols-via-c-s-bond-cleavage-reaction-development-and-mechanism-study
#19
Bingnan Du, Wenmin Wang, Yang Wang, Zheng-Hang Qi, Jiaqi Tian, Jie Zhou, Xiaochen Wang, Jianlin Han, Jing Ma, Yi Pan
A Cu-catalyzed cascade oxidative radical process of β-keto sulfones with alcohols has been achieved by using oxygen as an oxidant. In this reaction, β-keto sulfones were converted into sulfinate esters under the oxidative conditions via cleavage of C-S bond. Experimental and computational studies demonstrate that a new pathway is involved in this reaction, which proceeds through the formation of the key four-coordinated Cu(II) intermediate, O-O bond homolysis induced C-S bond cleavage and Cu-catalyzed esterification to form the final products...
January 12, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29327427/aerobic-photooxidative-synthesis-of-%C3%AE-alkoxy-mono-hydroperoxides-using-an-organo-photoredox-catalyst-controlled-by-a-base
#20
Yuya Asano, Yoshitomo Nagasawa, Eiji Yamaguchi, Akichika Itoh
In the proposed study, transition-metal-free synthesis of β-alkoxy monohydroperoxides via aerobic photooxidation using an acridinium photocatalyst was developed. This method enables the synthesis of some novel hydroperoxides. The peroxide source is molecular oxygen, which is cost-effective and is atomically efficient. Magnesium oxide plays an important role as a base in the catalytic system.
January 12, 2018: Chemistry, An Asian Journal
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