A ternary solid complex Eu(Et(2)dtc)(3)(phen) has been obtained from the reaction of sodium diethyldithiocarbamate (NaEt(2)dtc), 1,10-phenanthroline (phen) and hydrated europium chloride in absolute ethanol. The title complex was described by chemical and elemental analyses, TG-GTG and IR spectrum. The enthalpy change of liquid-phase reaction of formation of the complex, Delta(t)H(m)(theta) (1), was determined as -(13.481 +/- 0.0314) kJ (.) mol(-1) at T = 298.15 K by a RD-496 III heat conduction microcalorimeter. The enthalpy change of the solid-phase reaction of formation of the complex, Delta(t)H(m)(theta) (s), was calculated as (152.317 +/- 0.542) kJ (.) mol(-1) on the basis of a designed thermochemical cycle and other auxiliary thermodynamic qualities. The thermodynamics of reaction of formation of the complex was investigated by changing the temperature of liquid-phase reaction. Fundamental parameters, the apparent reaction rate constant (k), the apparent activation energy (E), the pre-exponential constant (A), the reaction order (n), the activation enthalpy (Delta H-not equal(0)), the activation entropy (Delta S-not equal(0)), the activation free energy (Delta G(not equal)(0)) and the enthalpy (Delta(r)H(not equal)(0)), were obtained combination the reaction thermodynamic and kinetic equations with the data of thermokinetic experiments. The constant-volume combustion energy of the complex, Delta(c)U, was determined as -(17410.63 +/- 8.95) kJ (.) mol(-1) by a RBC-Pi rotating-bomb calorimeter at T = 298.15 K. Its standard enthalpy of combustion, Delta(c)H(m)(0), and standard enthalpy of formation, Delta(f)H(m)(0), were calculated to be -(17429.84 +/- 8.95) kJ (.) mol(-1) and -(1231.76 +/- 9.92) kJ (.) mol(-1), respectively. (c) 2004 Elsevier Ltd. All rights reserved.