Abstract
The formation of TI+,Na+ and K+ cryptates with the ligand (222) in 10 nonaqueous solvents has been investigated by cyclic voltammetry at 25°C. Based on the results obtained the dependencies of stability constants of resulting 1 : 1 complexes on Gutmann donor numbers (DN) of the solvents and on standard Gibbs transfer energies of the metal ions from water to given solvent have been analyzed. It was found that DN describe the medium effect far better than the corresponding ΔGt o values. It can be deduced, therefore, that the stability constant changes are essentially limited by the cation desolvation free energies, but the residual solvation of the cation encapsulated in the ligand cavity is also important.
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