Dependence of enthalpies of formation of the Cu2+ complexes with glycinate ions on the composition of water-dimethylsulfoxide solvent

作者：Mikheev C V^*; Spichko A V; Sharnin V A

来源：Russian Journal of Physical Chemistry, 2012, 86(2): 215-218.

DOI：10.1134/S0036024412010220

• titration calorimeter
• enthalpies of formation of complexes
• glycinate ion
• dimethylsulfoxide
• solvation

Enthalpies of the complexing reactions of copper (II) with glycinate ions in mixtures of water with dimethylsulfoxide (DMSO) containing up to 0.9 mole parts of organic component (298 K) were obtained using a titration calorimeter. It was established that upon an increase in the DMSO content, the exothermicity of complexing increases at the first and second steps of the coordination. The obtained results were analyzed from the viewpoint of the solvation approach, based on the thermodynamic characterization of all reagents. It was shown that the main origin of the increase in the exothermicity of the complexing reactions is a weakening of ligand solvation when the DMSO concentration increases.

• 出版日期2012-2