Solute-solvent and solvent-solvent interactions in binary solvent mixtures .4. Preferential solvation of solvatochromic indicators in mixtures of 2-methylpropan-2-ol with hexane, benzene, propan-2-ol, ethanol and methanol

The Dimroth-Reichardt E(T)(30) betaine dye, 4-nitroanisole, 4-nitroaniline and N,N-diethyl-4-nitroaniline have been used to study preferential solvation in binary mixtures of 2methylpropan-Zol with hexane, benzene, propan-2-ol, ethanol and methanol at 30 degrees C over the whole range of solvent compositions. A theoretical equation which takes into account the solute-solvent and the solvent-solvent interactions has been successfully employed to correlate the experimental values with solvent composition. The indicators have been used to compute the Dimroth-Reichardt E(T)(30), and Kamlet-Taft pi*, alpha and beta solvatochromic parameters of the mixtures.