Thermodynamics of Copper(II) Complexes of Diamino Diamides in Aqueous Solution

Abstract

Abstract The equilibria occurring in aqueous solutions of N,N′‐bis(β‐carbamoylethyl)ethylenediamine, N,N′‐bis(β‐carbamoylethyl)trimethylenediamine, N,N′‐bis(β‐carbamoylethyl)‐1,2‐propylenediamine, and N,N′‐bis(β‐carbamoylethyl)‐2‐hydroxytrimethylenediamine with protons and copper(II) ions as well as the deprotonation reactions of the copper (II) complexes of these four ligands have been studied by calorimetry at T=25.0°C and I=0.10 mol dm −3 (NaClO 4 ). The enthalpy changes and the entropy changes for these reactions are reported and discussed.