Abstract
Abstract A relatively simple method is developed for studying preferential solvation in nonelectrolyte solutions based on the Nearly Ideal Binary Solvent (NIBS) and Extended NIBS model mathematical representation for how solute chemical potential varies with solvent composition. Expressions are derived for estimating the extent of preferential solvation around a nonelectrolyte solute from measured solubilities in binary solvent mixtures containing nonspecific and specific interactions. The computational method is illustrated with published data for anthracene, pyrene and carbazole dissolved in mixtures containing dibutyl ether plus n-octane and isooctane. Numerical values based on the derived expressions show the dissimilar preferential solvation behavior expected in mixtures containing the two noncomplexing polycyclic aromatic hydrocarbon solutes as compared to the complexing carbazole solute, which is believed to form a 1:1 molecular complex with dibutyl ether.
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