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Pt-195 NMR and Molecular Dynamics Simulation Study of the Solvation of [PtCl6](2-) in Water-Methanol and Water-Dimethoxyethane Binary Mixtures
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Stellenbosch University, South Africa; University of Cagliari, Italy.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Uppsala University, Sweden.
Number of Authors: 42018 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 57, no 19, p. 12025-12037Article in journal (Refereed) Published
Abstract [en]

The experimental Pt-195 NMR chemical shift, delta((195) Pt), of the [PtCl6](2-) anion dissolved in binary mixtures of water and a fully miscible organic solvent is extremely sensitive to the composition of the mixture at room temperature. Significantly nonlinear delta(Pt-195) trends as a function of solvent composition are observed in mixtures of water-methanol, or ethylene glycol, 2methoxyethanol, and 1,2-dimethoxyethane (DME). The extent of the deviation from linearity of the delta((195) Pt) trend depends strongly on the nature of the organic component in these solutions, which broadly suggests preferential solvation of the [PtCl6](2-) anion by the organic molecule. This simplistic interpretation is based on an accepted view pertaining to monovalent cations in similar binary solvent mixtures. To elucidate these phenomena in detail, classical molecular dynamics computer simulations were performed for [PtCl6](2-) in water-methanol and water-DME mixtures using the anionic charge scaling approach to account for the effect of electronic dielectric screening. Our simulations suggest that the simplistic model of preferential solvation of [PtCl6](2-) by the organic component as inferred from nonlinear delta(Pt-195) trends is not entirely accurate, particularly for water-DME mixtures. The delta(Pt-195) trend in these mixtures levels off for high DME mole fractions, which results from apparent preferential location of [PtCl6](2-) anions at the borders of water-rich regions or clusters within these inherently micro-heterogeneous mixtures. By contrast in water-methanol mixtures, apparently less pronounced mixed solvent micro-heterogeneity is found, suggesting the experimental delta(Pt-195) trend is consistent with a more moderate preferential solvation of [PtCl6](2-) anions. This finding underlines the important role of solvent-solvent interactions and micro-heterogeneity in determining the solvation environment of [PtCl6](2-) anions in binary solvent mixtures, probed by highly sensitive Pt-195 NMR. The notion that preferential solvation of [PtCl6](2-) results primarily from competing ion-solvent interactions as generally assumed for monatomic ions, may not be appropriate in general.

Place, publisher, year, edition, pages
2018. Vol. 57, no 19, p. 12025-12037
National Category
Chemical Sciences
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URN: urn:nbn:se:su:diva-162020DOI: 10.1021/acs.inorgchem.8b01554ISI: 000446413200021PubMedID: 30215514OAI: oai:DiVA.org:su-162020DiVA, id: diva2:1263295
Available from: 2018-11-15 Created: 2018-11-15 Last updated: 2018-11-15Bibliographically approved

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