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
刊名CHEMICAL GEOLOGY
2009
卷号268期号:1-2页码:#REF!
关键词Au(3+) OH(-)/Cl(-) molar ratio The local structure XANES EXAFS
学科分类Geochemistry & Geophysics
DOI10.1016/j.chemgeo.2009.07.012
通讯作者Wu, ZY (reprint author), Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230026, Peoples R China.
文章类型Article
英文摘要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.
类目[WOS]Geochemistry & Geophysics
收录类别SCI
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
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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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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