Solute–solvent and solvent–solvent interactions in binary solvent mixtures. Part 5. Preferential solvation of solvatochromic indicators in mixtures of propan-2-ol with hexane, benzene, ethanol and methanol

Abstract

The solvatochromic shifts of several indicators {2,6-diphenyl-4-(2,4,6-triphenyl-1-pyridinio)-1-phenolate [Reichardt’s E_T(30) betaine dye], 4-nitroanisole, 4-nitroaniline and N,N-diethyl-4-nitroaniline} have been measured in binary mixtures of propan-2-ol with hexane, benzene, ethanol and methanol at 25 °C over the whole range of solvent composition. From the UV–VIS spectroscopic data the preferential solvation of the indicators has been studied. The solvatochromic parameters E_T(30), π*, α and β of the binary solvent mixtures studied have been calculated from the solvatochromic shifts.