The solubilities of hexaamminecobalt(III) and tris(ethylenediamine) cobalt(III) hexacyanoferrates(III) were measured in water as well as in binary mixtures of water with tert-butyl alcohol and acetonitrile as a function of temperature. The Gibbs energies, enthalpies and entropies of transfer have been evaluated from experimental data. The contribution of [Co(NH3)(6)](3+), [Co(en)(3)](3+) and [Fe(CN)(6)](3-) ions to the Gibbs energies of transfer of the investigated salts have been calculated using the TATE reference electrolyte assumption.