SOLVATION OF FLUORIDE IONS .4. GIBBS ENERGIES OF TRANSFER FROM WATER TO AQUEOUS DIMETHYLSULFOXIDE, PROPANONE AND 2-METHYLPROPAN-2-OL MIXTURES

Solubility data are reported at 298. 15K for LiF, NaF and, to a lesser extent, KF in aqueous mixtures of dimethylsulphoxide (DMSO), propanon e, (acetone, AC) and 2-methylpropan-2-ol (tertiary butanol, t-BuOH) ov er virtually the entire solvent composition range. These data have bee n combined wherever possible with appropriate literature data to give standard Gibbs energies of transfer of the fluoride ion, Delta(t)G deg rees(F-), from water to the aqueous-organic mixtures on the basis of t he TATE assumption. Consistent with the poor acceptor properties of th e cosolvents cf: H2O all three systems show highly positive values of Delta(t)G degrees(F-). However, both DMSO and t-BuOH systems show some interesting anomalies as a function of solvent composition.