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The solvation effect component of the phenomenological model of solvent effects is applied to €,(30), the molar transition energy of the Dimroth-Reichardt betaine, in binary aqueous-organic solvents. The dependence of €,(30) on x,, the mole fraction of organic cosolvent, can be quantitatively described for all 17 systems studied. New data are given for 9 of these systems. It is found that a I-parameter model suffices to describe the composition dependence of the highly polar cosolvents, whereas a 2-parameter model is needed to account for other cosolvents, which yield a nonhyperbolic composition dependence. The solvation parameters, which are exchange equilibrium constants, yield correlations suggesting their positive dependence on cosolvent hydrophobicity and electron-pair donor ability.Paper 3106277E

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