Thermochemistry of gadolinium chloride hydrate with diethylammonium diethyldithiocarbamate

The complex of gadolinium chloride lower hydrate with diethylammonium diethyldithiocarbamate (D-DDC) has been synthesized in absolute alcohol under a N2 atmosphere. Chemical analyses showed that the complex had a general formula Et2NH2[Gd(S2CNEt2)4]. It was characterized by Infra-red (IR) spectroscopy. The enthalpies of solution of gadolinium chloride hydrate and D-DDC in absolute alcohol at T=298.15 K and the enthalpy of formation of Et2NH2[Gd(S2CNEt2)4] as a function of temperature were determined by microcalorimetry. On the basis of experimental results, three thermodynamic parameters, the activation enthalpy, the activation entropy and the activation free energy, the rate constant and three kinetic parameters, the apparent activation energy, the pre-exponential constant and the reaction order of liquid phase reaction of formation were obtained.