Silver(I)–polyamine systems in dimethyl sulphoxide. A thermodynamic and spectroscopic investigation

Abstract

The thermodynamic parameters ΔG°, ΔH° and ΔS° of complexes of silver(I) with 3,3′-diaminopropylamine(DPT) as well as the heats of formation of silver(I) with 1,2-diaminoethane (EN), 1,3-diaminopropane (TN), and diethylenetriamine (DIEN) have been measured in dimethyl sulphoxide (DMSO) at 25 °C and in a medium of ionic strength 0.1 mol dm^–3. N.m.r. spectra of solutions of silver(I) and ligands investigated have also been performed. From a combination of thermodynamic and spectroscopic data conclusions are drawn about the nature and structure of the complexes formed in solution. The silver(I) complexes are all stronger in DMSO than in water, reflecting the higher solvation of the ligands in water, through stronger hydrogen bonds, than in DMSO.