Preferential Solvation of Single Ions

The standard free energies of transfer for the U+4, UÜ2+2, UCU-2 and UOäCU-2 ions from water to various mixed aqueous-ethanol solvents are determined by the extraction equilibrium study. The distribution equilibria of metal ions between water and nonpolar solvent and between mixed solvent and nonpolar solvent provide the hypothetical distribution equilibrium between water and mixed solvent, for which the nonpolar phase plays the complementary solvent for experimental convenience. From this relationship, the medium effects myi for the extracted complex species i as well as the ratio of their formation constants in water and in mixed solvent are also determined with the help of the medium effect for the chloride ligand ion from the literature. The formation constant of a complex species ML„ in water (w) and in mixed solvent (s) has the relation:

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