Shared solvation of sodium ions in alcohol-water solutions explains the non-ideality of free energy of solvation

Kathrin M. Lange, Ulf Bergmann, Kai F. Hodeck, René Könnecke, Ulrich Schade, Emad F. Aziz

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4 Citations (Scopus)


In order to explain the discrepancies between theories and experiments regarding the non-ideality in the free energy of solvation, here we present a microscopic picture of sodium ions dissolved in water-alcohol mixed solvents. We used X-ray absorption spectroscopy to probe the K-edge of sodium ions in mixed solvents of water and alcohols (methanol, ethanol) and in the respective pure solvents. In the mixed solvents a shared solvation of the sodium ions is observed. We find that specifically the water component plays a key role in stabilizing the solvation shell in mixed solvents, which was revealed by a selective photochemical process occurring only in the pure alcohol solvents. This journal is

Original languageEnglish
Pages (from-to)15423-15427
Number of pages5
JournalPhysical Chemistry Chemical Physics
Issue number34
Publication statusPublished - 14 Sep 2011
Externally publishedYes

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