In-Depth XANES and EXAFS Characterization of the Ag+ Ion Coordination in Dimethyl Sulfoxide Solution

X-ray absorption near-edge structure (XANES) spectroscopy has been used, in conjunction with extended X-ray absorption fine structure (EXAFS), to determine the coordination structure of the Ag+ ion in a dimethyl sulfoxide (DMSO) solution. From the EXAFS data analysis, the Ag–O first shell distance i...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2024-08, Vol.128 (33), p.8065-8073
Main Authors: Tofoni, Alessandro, Busato, Matteo, Colella, Andrea, Melchior, Andrea, D’Angelo, Paola
Format: Article
Language:English
Subjects:
B: Liquids
Chemical and Dynamical Processes in Solution
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Summary:X-ray absorption near-edge structure (XANES) spectroscopy has been used, in conjunction with extended X-ray absorption fine structure (EXAFS), to determine the coordination structure of the Ag+ ion in a dimethyl sulfoxide (DMSO) solution. From the EXAFS data analysis, the Ag–O first shell distance in DMSO was found to be 2.31(3) Å, with 4.1(5) oxygen atoms surrounding the Ag+ ion, in fair agreement with previous results. This technique did not allow us to determine the geometry of the 4-fold coordination complex and a quantitative analysis of the XANES region was carried out to shed light on this issue. The XANES data analysis confirmed the presence of a four-coordinated complex, unambiguously showing that a regular tetrahedral [Ag­(DMSO)4]+ complex is formed when silver triflate is dissolved in DMSO solution.
ISSN:1520-6106
1520-5207
1520-5207
DOI:10.1021/acs.jpcb.4c04001