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Correlation between local structure and molar ratio of Au (III) complexes in aqueous solution: An XAS investigation
Chen, X; Chu WS(储旺盛); Chen DL(陈栋梁); Wu ZH(吴忠华); Wu ZY(吴自玉); Chu, WS; Chen, DL; Wu, ZH; Marcelli, A; Wu, ZY
2009
发表期刊CHEMICAL GEOLOGY
卷号268期号:1-2页码:#REF!
通讯作者Wu, ZY (reprint author), Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230026, Peoples R China.
摘要The local and geometrical structure around gold (III) e.g., AU(3+) ions in aqueous solution with different OH(-)/Cl(-) molar ratios, has been investigated by X-ray absorption spectroscopy (XAS). X-ray absorption near-edge structure (XANES) spectra of [AuCl(n)(OH)(4-n)](-) solutions have been calculated and the multiple-scattering ectral features have been attributed to Cl d-states, axial water molecules and the replacement of Cl(-) ligands by OH(-) ligands. A square-planar geometry for [AuCl(n)(OH)(4-n)](-) with two axial water molecules has been identified. Moreover, a spectral correlation between XANES features and the type of planar atoms has been identified. By extended X-ray absorption fine structure spectra (EXAFS), the planar Au bond distances in the solutions have also been determined, e.g., 2.28 angstrom for Au-Cl and 1.98 angstrom for Au-O, respectively. The same EXAFS analysis provides evidence that the peak at about 4.0 angstrom in solutions with the lowest OH(-)/Cl(-) molar ratio arises from collinear Cl-Au-Cl multiple-scattering contributions. For the first time, a complete detailed reconstruction of the hydration structure of an Au ion at different pH values has been achieved. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
文章类型Article
关键词Au(3+) OH(-)/Cl(-) molar ratio The local structure XANES EXAFS
学科领域Geochemistry & Geophysics
DOI10.1016/j.chemgeo.2009.07.012
收录类别SCI
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000271367200009
引用统计
被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225961
专题多学科研究中心
推荐引用方式
GB/T 7714
Chen, X,Chu WS,Chen DL,et al. Correlation between local structure and molar ratio of Au (III) complexes in aqueous solution: An XAS investigation[J]. CHEMICAL GEOLOGY,2009,268(1-2):#REF!.
APA Chen, X.,储旺盛.,陈栋梁.,吴忠华.,吴自玉.,...&Wu, ZY.(2009).Correlation between local structure and molar ratio of Au (III) complexes in aqueous solution: An XAS investigation.CHEMICAL GEOLOGY,268(1-2),#REF!.
MLA Chen, X,et al."Correlation between local structure and molar ratio of Au (III) complexes in aqueous solution: An XAS investigation".CHEMICAL GEOLOGY 268.1-2(2009):#REF!.
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