XAFS study of Cu^(2+) in aqueous solution of CuBr_2

查看全文 作　　者：DAI Binbin WANG Qian MA Jingyuan LI Jiong ZHANG Shuo HUANG Yuying HUANG Wei WU Guozhong ZOU Yang JIANG Zheng XU [1]Hongjie

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China

出　　处：《Nuclear Science and Techniques》索引2012年第23卷第3期,共5页

基　　金：Supported by National Natural Science Foundation of China (Grant No.11005148,10705046,11135008);National Basic Research Program of China (Grant No. 2010CB934501);Special Presidential Foundation of the Chinese Academy of Science (Grant No. 29);Science and Technology Commission of Shanghai Municipality (Grant No. 11JC1414900) 摘　　要：Copper ion is the essential microelement to many organisms. In this paper, the local structure of Cu2+ in CuBr2 aqueous solutions with different concentrations are investigated by using X-ray absorption fine structure (XAFS) technique. XANES (X-ray Absorption Near Edge Structure) spectra indicate that charge transfer from Br- to Cu2+ decreases with the solution concentration, which lead to a shift of the absorption edge. The shoulder appearing at the rising edge proves to be characteristic of a tetragonal distortion. The Fourier transform magnitudes of EXAFS (Extended X-ray absorption fine structure) data of Cu species suggest that more Cu-Br bonds may exist in high concentrations. A fivefold coordination configuration like a pyramid is used as the fitting parameters. From the analysis of the coordination numbers, the proportion of Cu-O and Cu-Br is 4:1 in the saturated solution. The Br atom is on the equatorial plane of the model. The fitting results agree well with the experiment data. 关键词：EXAFS 水溶液 X-射线吸收精细结构 X射线吸收精细结构 X射线吸收近边结构 XANES 傅立叶变换微量元素

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XAFS study of Cu^(2+) in aqueous solution of CuBr_2

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