NDLI: Composition and structure of Pt chloride complexes in hydrothermal solutions, according to X-ray absorption spectroscopy

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Russian Journal of Physical Chemistry : Volume 91, Issue 1, January 2017

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Composition and structure of Pt chloride complexes in hydrothermal solutions, according to X-ray absorption spectroscopy

Content Provider	Springer Nature Link
Author	Tagirov, B. R. Trigub, A. L. Selivav, P. V. Koroleva, L. A.
Copyright Year	2017
Abstract	The local atomic environment of Pt in chloride solutions is studied at 25 and 300–350°C via X-ray absorption spectroscopy. A comparison of the Pt L $_{3}$-edge XANES spectra for aqueous chloride solutions and reference compounds (K$_{2}$PtCl$_{4}$ and K$_{2}$PtCl$_{6}$) shows that platinum is in oxidation state +2 at all temperatures, and the complex composition remains unchanged in the experimental range of temperatures (25–350°С) and solution compositions (m(Cl$_{tot}$) > 0.4 mol kg$^{−1}$ of H$_{2}$O). Based on EXAFS spectral analysis, the composition of the complex being dominant in chloride solutions is found to be PtCl$_{4}$ $^{2-}$ with interatomic Pt–Cl distances of 2.31 ± 0.01 Å, regardless of the temperature. It is concluded that the local environments of Pt and Pd in hydrothermal solutions are similar, and the main form of transfer for these metals is a square-planar complex with four Cl ligands and identical interatomic distances.
Starting Page	543
Ending Page	548
Page Count	6
File Format	PDF
ISSN	00360244
Journal	Russian Journal of Physical Chemistry
Volume Number	91
Issue Number	3
e-ISSN	1531863X
Language	English
Publisher	Pleiades Publishing
Publisher Date	2017-02-28
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	platinum chloride complexes hydrothermal solutions X-ray absorption spectroscopy EXAFS XANES Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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