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Dickson Joseph, Rengarajan Baskaran, Su Geun Yang, Yun Suk Huh, Young-Kyu Han
We report a one-pot seedless green method for the synthesis of gold-silver (AuAg) spiky branched nanostars, with gold (90%) being the major component. Here, the zwitterionic surfactant lauryl sulfobetaine (LSB) is employed in the synthesis of bimetallic nanostars. The concentration of LSB plays an important role in determining the shape of nano-objects. A minimum LSB concentration of 50 mM is required for the formation of spiky branched nanostars, the size of which is controlled by increasing the LSB concentration...
February 7, 2019: Journal of Colloid and Interface Science
Bochao Su, Kei Ota, Yongxin Li, Rei Kinjo
The reactions of germylone 1 with one equivalent of [M(COD)Cl]2 (M = Ir, Rh) afforded the germylone-bridged bimetallic complexes 2 and 3, which have been spectroscopically and structurally characterized. Density functional theory (DFT) studies reveal the relatively strong interactions between the Ge atom and these metals. By the reaction of [Rh(COD)Cl]2 with CO followed by addition of 1, a complex 4 involving a Rh-Ge-Rh-Ge-Rh chain was also synthesized.
February 14, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Haoran Tang, Hua Hao, Jiahui Zhu, Xianping Guan, Baijing Qiu, Yongxin Li
Understanding of the electrocatalytic activity at single nanoparticles/nanoclusters level is extremely important. In this work, we describe a method for the electrodeposition of single Pt-Pd nanoparticles using single nanopore electrode as a template. The electrodeposition process has been investigated carefully and the results show that the process is controlled by the diffusion-controlled process and electro-crystallization process simultaneously, and the glass sheath property around nanopore has big impact on the formation of single Pt-Pd NPs due to the "edge effect"...
February 13, 2019: Chemistry: a European Journal
Lei Zhang, Zihang Wang, Xing Xu, Cheng Chen, Baoyu Gao, Xiaolong Xiao
3D self-assembled cellulose/graphene hybrids (3D cell/GO hybrids) were used as the host for encapsulating the Zr and La hydroxides, forming the Zr/La-cell/GO hybrids. After phosphate adsorption, the crystallization peaks of LaPO4 ·xH2 O in saturated Zr/La-cell/GO hybrids were observed and they were reduced with the increase in pHs. Especially, a low crystallization was observed at pH 10.0 as compared with those at pH 3.0 and 6.0; this also corresponded well to the varied adsorption capacity as a function of pHs...
February 25, 2019: Science of the Total Environment
Virender K Sharma, Christie M Sayes, Binglin Guo, Suresh Pillai, Jason G Parsons, Chuanyi Wang, Bing Yan, Xingmao Ma
Global production of engineered nanoparticles (ENPs) continues to increase due to the demand of enabling properties in consumer products and industrial applications. Release of individual or aggregates of ENPs have been shown to interact with one another subsequently resulting in adverse biological effects. This review focuses on silver nanoparticles (AgNPs), which are currently used in numerous applications, including but not limited to antibacterial action. Consequently, the release of AgNPs into the aquatic environment, the dissociation into ions, the binding to organic matter, reactions with other metal-based materials, and disruption of normal biological and ecological processes at the cellular level are all potential negative effects of AgNPs usage...
February 25, 2019: Science of the Total Environment
Haifeng Zheng, Yan Wang, Chaoran Xu, Qian Xiong, Lili Lin, Xiaoming Feng
Here we reported our strategy by combining the transition metal-catalyzed diversified cycloisomerization of 1,6-enynes with chiral Lewis acid-promoted asymmetric Diels-Alder sequence reaction, realizing the asymmetric different cycloisomerization/Diels-Alder relay reactions of 1,6-enynes with electron deficient alkenes. A broad spectrum of chiral [5,6]-bicyclic products could be acquired in high yields (up to 99%) with excellent diastereoselectivies (> 19:1 dr) and enantioselectivities (up to 99% ee).
February 13, 2019: Angewandte Chemie
Taraknath Chattopadhyay, Anju B S, Shourya Gupta, Ananya S, Jeffery A Bertke, Subrata Kundu
Nitrate and nitrite anions have multifaceted impacts on the environment and human health. We herein report selective recognition of nitrite over nitrate anion inside the cavity of bimetallic azacryptates having p-xylyl spacers. This work reveals a number of binding interactions which play pivotal roles in nitrite anion recognition by rigid metal cryptates.
February 13, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Chaolu Eerdun, Thi Hien Thuy Nguyen, Takuya Okayama, Satoshi Hisanaga, Jun-Ichiro Setsune
Hexapyrrole-α,ω-dicarbaldehydes (1a and 1b) were metallated with Cu(II), Ni(II), and Pd(II) to give bimetallic complexes where a pair of 3N+O four-coordinate metal planes are helically distorted and the central 2,2'-bipyrrole subunit adopts cis or trans conformation. X-ray crystallography of the bisCu complex revealed a closed form having a cis-2,2'-bipyrrole subunit and an open form having an trans-2,2'-bipyrrole subunit. The bisPd complexes took a closed form both in the solid state and in solution. They are regarded as single helicates of two turns and the energy barrier for interchange between M-helix and P-helix was remarkably influenced by the bulky 3,3'-substituent of the central 2,2'-bipyrrole subunit...
February 12, 2019: Chemistry: a European Journal
Xiaoxiao Chu, Jihao Jin, Bangrong Ming, Maofu Pang, Xin Yu, Chen-Ho Tung, Wenguang Wang
The synergism of the electronic properties of nickel and cobalt enables bimetallic NiCo complexes to process H2 . The nickel-cobalt hydride [(dppe)Ni(pdt)(H)CoCp*]+ ( [1H]+ ) arising from protonation of the reduced state 1 was found to be an efficient electrocatalyst for H2 evolution with Cl2 CHCOOH, and the oxidized [Ni(ii)Co(iii)]2+ form is capable of activating H2 to produce [1H]+ . The features of stereodynamics, acid-base properties, redox chemistry and reactivity of these bimetallic NiCo complexes in processing H2 are potentially related to the active site of [NiFe]-H2 ases...
January 21, 2019: Chemical Science
Qiang Wang, Yao Chen, Zhenhua Li
Fossil fuel consumption, global warming, climate change, and price fluctuation of fuels push scientists to search for alternative ways to produce fuel. From the viewpoint of CO₂ capture and utilization, using CO₂ as raw material to produce value-added products is attractive because it can not only alleviate global warming but also offers a solution to replace dwindling fossil fuels. Especially the technique of CO₂ hydrogenation to low-carbon olefins including ethylene, propylene and butylene is highly attractive...
June 1, 2019: Journal of Nanoscience and Nanotechnology
Danni Jiang, Danlian Huang, Cui Lai, Piao Xu, Guangming Zeng, Jia Wan, Lin Tang, Haoran Dong, Binbin Huang, Tianjue Hu
Bimetallic Fe/Cu nanoparticles were successfully stabilized by chitosan used for remediating hexavatlent chromium contaminated wasterwater. However, the over-loaded chitosan on the surface of Fe/Cu particles limited the Cr(VI) reduction due to the occupation of the surface reactive sites. Weighing the colloid stability and the reduction reactivity, the optimal dosage of chitosan is 2.0 wt% and the optimal Cu doping dosage is 3.0 wt%. SEM and TEM images showed that the chitosan-stabilized Fe/Cu bimetallic nanoparticles (CS-Fe/Cu nanoparticles) were uniformly dispersed, which had loose and porous surface...
December 10, 2018: Science of the Total Environment
Chuanyi Jia, Xijun Wang, Wenhui Zhong, Zhunzhun Wang, Oleg V Prezhdo, Yi Luo, Jun Jiang
The versatile properties of bimetallic nanoparticles greatly expand the range of catalyzed chemical reactions. We demonstrate that surface chemistry can be understood and predicted using a simple adsorbate-surface interaction descriptor that relates charge polarization to chemical reactivity. Our density functional theory studies of O2 activation and CO oxidation catalyzed by Au7 -Cu1 bimetallic nanoparticles supported on the TiO2 (101) surface demonstrate that the generated oxidized Cu atom (CuOx ) can efficiently inhibit the aggregation of the active Cu sites...
February 11, 2019: ACS Applied Materials & Interfaces
Elena Lalinde, Teresa Moreno, Nora Giménez, Rebeca Lara
Pentafluorophenyl benzoquinolinyl PtII [Pt(bzq)(HC^N-κN)(C6F5)] (1a-g) complexes, bearing non-metalated N-heterocyclic HC^N ligands (HC^N = Hoxd a, dfppy b, pbt c, Br-pbt d, pq e, thpy f, pypy g), and heteroleptic bis(cyclometalated) PtIV fac-[Pt(bzq)(C^N)(C6F5)Cl] (2b-g) derivatives, generated by oxidation of 1b-g with PhICl2, are reported. The oxidation reaction of 1a evolves with formation of the bimetallic PtIV complex syn-[Pt(bzq)(C6F5)Cl(µ-OH)]2 3. The crystal structures of 1a,d,f, 2b,d,e and 3 have been corroborated by X-ray crystallography...
February 11, 2019: Chemistry: a European Journal
Ting Ting Zhao, Zhong Wei Jiang, Shu Jun Zhen, Cheng Zhi Huang, Yuan Fang Li
A bimetallic organic gel was prepared by mixing the bridging ligand 2,4,6-tri(4-carboxyphenyl)-1,3,5-triazine with Cu(II) and Co(II) ions at room temperature. The resulting metal-organic gel (MOG) shows enhanced peroxidase-like activity, most likely due to the synergetic redox cycling between Co(III)/Co(II) and Cu(II)/Cu(I) pairs. These accelerate interfacial electron transfer and generation of hydroxy radicals. The MOG can catalyze the reaction of H2 O2 with terephthalic acid (TPA), producing a blue fluorescence product with the maximum excitation/emission at 315/446 nm...
February 9, 2019: Mikrochimica Acta
Javier Martínez, Felipe de la Cruz-Martínez, Miguel A Gaona, Esther Pinilla-Peñalver, Juan Fernández-Baeza, Ana M Rodríguez, José A Castro-Osma, Antonio Otero, Agustín Lara-Sánchez
New bifunctional aluminum complexes have been prepared with the aim of studying the effect of a counterion on the synthesis of cyclic carbonates from epoxides and carbon dioxide (CO2 ). Neutral ligand 1 was used as a precursor to obtain four novel mesylate, chloride, bromide, and iodide zwitterionic NNO ligands (2-5). The reaction of these ligands with 1 or 2 equiv of AlR3 (R = Me, Et) allowed the synthesis of mono- and bimetallic bifunctional aluminum complexes [AlR2 (κ2 -mbpzappe)]X [X = Cl, R = Me (6), Et (7); X = Br, R = Me (8), Et (9); X = I, R = Me (10), Et (11)] and [{AlR2 (κ2 -mbpzappe)}(μ-O){AlR3 }]X [X = MeSO3 , R = Me (12), Et (13); X = Cl, R = Me (14), Et (15); X = Br, R = Me (16), Et (17); X = I, R = Me (18), Et (19)] via alkane elimination...
February 8, 2019: Inorganic Chemistry
Yu-Ju Chen, Yi-Rui Chen, Cheng-Hsuan Chiang, Kuo-Lun Tung, Tsung-Kuang Yeh, Hsing-Yu Tuan
The slow kinetics of ethanol oxidation reaction (EOR) has limited its widespread use for fuel cells. Bimetallic catalysts with optimized surface compositions can considerably govern rate-determining steps through selectivity for CH3COOH formation or by facilitating the adsorption of OHads via the bifunctional effect of an alloy to increase the EOR's kinetic rates. Here, we reported monodisperse ordered In-Pd nanoparticles as new bimetallic high-performance catalysts for EOR. In-Pd nanoparticles, i.e., In3Pd2 and In3Pd5 were prepared using arrested precipitation in solution, and their composition, structures, phase and crystallinity were confirmed using a variety of analyses including TEM, XPS, EDS and XRD...
February 6, 2019: Nanoscale
Fan-Wei Wang, Chia-Wei Hsu, Chih-Chen Hsieh
Stimuli-responsive polymers are capable of responding to external stimuli and therefore have been widely used for sensing. However, such applications are often based on naïve designs and cannot achieve desired performance. In this study, we created a micro thermosensor with temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) hydrogel and temperature-insensitive poly(ethylene glycol) diacrylate (PEGDA) hydrogel using stop-flow lithography(SFL). The thermosensor is a bihydrogel microparticle consisting of a NIPAM-rich section and a NIPAM-poor section...
February 6, 2019: ACS Applied Materials & Interfaces
Yixuan Wang, Weijie Zhang, Xinli Guo, Kai Jin, Zhongtao Chen, Yuanyuan Liu, Liangliang Yin, Long Li, Kuibo Yin, Litao Sun, Yuhong Zhao
Transition-metal selenide electrodes have recently attracted increasing interests in supercapacitors result from their superior electrochemical performance, lower-cost and environmental friendliness. Herein, we report a novel bimetallic Ni-Co selenide nanosheets/3D graphene/nickel foam binder-free electrode (NiCo2.1Se3.3 NSs/3D G/NF) prepared via chemical vapor deposition (CVD) followed by a simple two-step hydrothermal process in this paper. The NiCo2.1Se3.3 NSs array vertically on 3D G/NF with a uniform and stable structure without using any chemical binders...
February 5, 2019: ACS Applied Materials & Interfaces
Erika M Dematteis, Claudio Pistidda, Martin Dornheim, Marcello Baricco
Binary combinations of borohydrides have been extensively investigated evidencing the formation of eutectics, bimetallic compounds or solid solutions. In this paper, the investigation was extended to ternary and quaternary systems in the LiBH4-NaBH4-KBH4-Mg(BH4)2-Ca(BH4)2 system. Possible interactions among borohydrides in equimolar composition was explored by mechanochemical treatment. Obtained phases were analysed by X-ray diffraction and the thermal behaviour of the mixtures were analysed by HP-DSC and DTA, defining temperature of transitions and decomposition reactions...
February 4, 2019: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Weixin Zou, Lixia Xu, Yu Pu, Haojie Cai, Xiaoqian Wei, Yidan Luo, Lulu Li, Haiqin Wan, Bin Gao, Lin Dong
The bimetallic AgPd nanoparticles have been synthesized, but the interfacial electronic effects of AgPd on the photocatalytic performance are less investigated. In the work, the results of hydrogen evolution suggest that bimetallic AgPd/g-C3N4 sample has superior activity than Ag/g-C3N4 and Pd/g-C3N4 photocatalysts. The UV-vis DRS, XPS, CO adsorption DRIFTS and FT-IR results demonstrate that in the AgPd/g-C3N4, the surface electronic structures of Pd and Ag are changed, which is beneficial for faster photo-generated electron transfer and more H2O molecule adsorption...
February 4, 2019: Chemistry: a European Journal
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