期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 920, 期 1-3, 页码 40-44出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2008.10.016
关键词
Pt4+; The local structure; XANES; EXAFS
资金
- National Natural Science Foundation of China [90206032]
- Outstanding Youth Fund [10125523]
- Chinese Academy of Sciences [KJCX2-SW-N11, KJCX2-SW-H12-02]
The noble metal ions play an important role in many chemical reactions, but at the present time they represent also potentially new environmental contaminants. There is relatively little information available to adequately assess the potential health hazards, so that to evaluate the potential hazards and identify the necessary actions to reduce the risks associated with exposure to these metals and their compounds it is important to understand the local structure around noble metal ions. In this contribution, the local coordination around platinum (IV) ions e.g., Pt4+ in aqueous solution, has been investigated by using X-ray absorption spectroscopy (XAS). X-ray absorption near-edge spectra (XANES) of both (PtCl6](2-) and [PtCl4(OH)(2)](2-) in an aqueous solution have been calculated using FEFF8.2 and both are characterized by an octahedral geometry. From these calculations, we may also assign a characteristic post-edge feature to a contribution of Cl cl-states. From the EXAFS analysis we also determined the corresponding Pt bond distances, e.g., 2.33 angstrom for the Pt-Cl distance and 2.03 angstrom for the Pt-O distance in these aqueous solutions. The same analysis provides evidence that the peaks in the Fourier transform at about 4.0 angstrom are due to multiple scattering collinear Cl-Pt-Cl contributions. (C) 2008 Elsevier B.V. All rights reserved.
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