The complex of lanthanum chloride lower hydrate with diethylammonium diethyldithiocarbamate (D-DDC) has been synthesized in dry N2 atmosphere and absolute alcohol. The composition of the complex Et2NH2 [ La (S2-CNEt2)4] was determined by chemical and elemental analyses. The enthalpies of solution of lanthanum chloride hydrate and D-DDC in absolute alcohol at 298.15 K and the enthalpy change of liquid-phase reaction of foimation for Et2NH2[La(S2CNEt2)4] at different temperatures were determined by a microcalorimeter. On the basis of experimental and calculated 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 foimation were obtained. The enthalpy change of solid-phase title reaction was obtained by rational thermochemical cycle.

Key words: anthanum chloride, diethylammonium diethyldithiocarbamate, ETHANOL, THERMODYNAMIC PROPERTIES, ACTIVATION ENERGY