Preferential Solvation of a Dipolar Solute in Mixed Binary Solvent. A Study by UV-Visible Spectroscopy

Article abstract of DOI:10.1021/j100161a064

The preferential solvation in mixed binary solvent, e.g., ethanol + acetonitrile, ethanol + propionitrile, and ethanol + butyronitrile, has been studied by monitoring the solvatochromic charge-transfer band of N-alkylpyridinium iodide.It appears that alcohols are preferred over the nitriles.A model for describing the preferential solvation of a dipolar solute in binary solvent mixture has been developed and discussed in relation to other existing approaches.The role of (a) solvent-solvent interaction and (b) difference in size of the component solvent molecules in determining the preferential solvation has also been discussed.