Solubility of potassium cyanide in mixed aqueous and non-aqueous media; Gibbs free energies of transfer of the cyanide ion

Abstract

Solubilities of potassium cyanide in a variety of non-aqueous solvents and binary aqueous solvent mixtures are reported. From these results and from published data on Gibbs free energies of transfer of the potassium ion, Gibbs free energies have been estimated for transfer of the cyanide ion from water into a selection of mixed aqueous and non-aqueous media. With the aid of these transfer parameters, reactivity trends for the reaction of the [Fe(bipy)₃]²⁺ cation (bipy = 2,2′-bipyridyl) with cyanide ion in mixed aqueous solvents are analysed for initial-state and transition-state contributions.