Temperature dependence of ion association constants in nonaqueous solutions of metal perchlorates

The ion association constants in nonaqueous solutions of singly and doubly charged metal perchlorates in organic solvents in a wide range of temperatures have been calculated by integrating the ligand distribution density function. The standard Gibbs energies, entropies, and enthalpies of formation of ion pairs have been calculated. Comparison with experimental data have shown that diluted solutions of doubly charged metal perchlorates are dominated by solvent-separated ion pairs, whereas such pairs coexist with contact ion pairs in solutions of alkali metal perchlorates. It has been demonstrated that the dielectric continuum approximation satisfactorily predicts the temperature dependence of ion association constants.