Abstract
Absorption spectra of a flavonoid (morin hydrate) were studied in pure water, methanol, ethanol, 1-propanol, and 2-propanol and also in their aqueous binary mixtures at 25.0°C. Spectral changes were interpreted in terms of specific and non-specific solute-solvent interactions. The molar transition energy (ET) in the maximum absorption as a solvatochromic probe was measured in each binary mixture. The local mole fraction of each solvent composition calculated in the cybotactic region of the probe. The extent and importance of each solute-solvent interaction to ET was analyzed in the framework of the linear solvation energy relationships. Preferential solvation was detected as a non-ideal behavior of ET curve respective to the mole fraction of the alcohols in all the binary mixtures. The preference of morin hydrate to be solvated by one of the solvating species relative to the others was discussed in terms of solvent-solvent and solute-solvent interactions.
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