Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 34, Pages 15423-15427Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1cp20527g
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Funding
- Helmholtz-Gemeinschaft [VH-NG-635]
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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.
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