Thermodynamic study on complex of neodymium with glycine

Neodymium complex with glycine, Nd(Gly) 2 Cl 3 ·3H 2 O, was synthesized and characterized by IR spectra. The thermal stability of the complex was tested through TG and DTG and a possible mechanism of thermal decomposition was proposed. The heat capacities of the complex were measured by using an automated adiabatic calorimeter over the temperature range from T   =   (80 to 380)   K, the thermodynamic functions, [ H T   −   H 298.15 ] and [ S T   −   S 298.15 ], were calculated based on the heat capacity measurements. Two (solid   +   solid) phase transitions in the ranges of T   =   (170 to 247)   K were observed with the peak temperatures of 184.896   K and 231.217, respectively. The standard molar enthalpy of formation of [Nd(Gly) 2 Cl 3 ·3H 2 O] was determined to be (−3081.3   ±   1.1)   kJ   ·   mol −1 in terms of an isoperibol solution-reaction calorimeter.