Solute–solvent and solvent–solvent interactions in binary solvent mixtures. Part 3. The ET(30) polarity of binary mixtures of hydroxylic solvents

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Abstract
Solvent exchange models have been applied to the transition energy of the Dimroth–Reichardt ET(30) solvatochromic indicator in binary hydroxylic solvents at 25 °C. The models tested have been critically evaluated to show the simplifications and limitations inherent to each model. A general five-parameter model [two preferential solvation and three ET(30) parameters] has been selected as the most appropriate. This model fits well the 51 binary systems tested in this work and 19 different ones previously studied. It also allows a quantitative interpretation of the ET(30) behaviour of the binary systems in terms of solute–solvent and solvent–solvent interactions.

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