XAFS study of Cu2+ in aqueous solution of CuBr2

被引：0

作者：

Dai Binbin ^{[1
]}

Wang Qian ^{[1
]}

Ma Jingyuan ^{[1
]}

Li Jiong ^{[1
]}

Zhang Shuo ^{[1
]}

Huang Yuying ^{[1
]}

Huang Wei ^{[1
]}

Wu Guozhong ^{[1
]}

Zou Yang ^{[1
]}

Jiang Zheng ^{[1
]}

Xu Hongjie ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China

来源：

NUCLEAR SCIENCE AND TECHNIQUES | 2012年 / 23卷 / 03期

基金：

中国国家自然科学基金;

关键词：

CuBr2; Aqueous solution; XAFS; coordination; FIVEFOLD COORDINATION; FINE-STRUCTURE; AQUA ION; COPPER; XANES; CU(II); SHELL; EXAFS; SITE; DISTORTION;

D O I：

暂无

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

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.

引用

页码：129 / 133

页数：5

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