Abstract
The influence of the composition of acetonitrile-dimethyl sulfoxide solvent on shifting complexation equilibrium between silver(I) and ethylenediamine was studied potentiometrically at 298.15 K. The stability of the monoethylenediamine complex with silver(I) was found to increase with increasing acetonitrile content in the mixed solution, while the stability of bis-complexes changes only insignificantly. A decrease in the Gibbs energy of formation of [AgEn]+ ion was found to be caused by resolvation of the monoligand ion and a reduced stability of the solvation complex of silver(I). The Gibbs energy for the second coordination step remained constant due to the mutual compensation for the solvation contributions from all reagents.
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