Abstract
The charge transfer (CT) band maximum of N-alkyl pyridinium iodide (NAPI) has been studied as a function of the composition of binary mixed dipolar aprotic solvents. The deviation from linearity of the energy maximum (E12) and the mole fraction (of a component solvent) plot is explained as due to a preferential solvation by the more polar cosolvent in the binary mixture. The extent of preferential solvation has been observed to vary with the composition, the maximum being towards the less-polar end. The role of hydrogen bond donating ability of a solvent in preferential solvation is discussed.
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Chatterjee, P., Medda, K. & Bagchi, S. A study of preferential solvation of N-alkyl pyridinium iodides in mixed solvents containing acetonitrile. J Solution Chem 20, 249–255 (1991). https://doi.org/10.1007/BF00649533
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DOI: https://doi.org/10.1007/BF00649533