Thermodynamic study on complex of neodymium with glycine

•Nd(Gly)2Cl3·3H2O was synthesized and characterized by IR spectra.•Thermal stability was tested and mechanism of thermal decomposition was proposed.•Heat capacities were measured at T = (80 to 330) K and thermodynamic functions were calculated.•Standard molar enthalpy of formation was determined.

Neodymium complex with glycine, Nd(Gly)2Cl3·3H2O, 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, [HT − H298.15] and [ST − S298.15], 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)2Cl3·3H2O] was determined to be (−3081.3 ± 1.1) kJ · mol−1 in terms of an isoperibol solution-reaction calorimeter.

Graphical abstractNeodymium complex with glycine, Nd(Gly)2Cl3·3H2O, 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 (80 to 380) K, the thermodynamic functions, [HT − H298.15] and [ST − S298.15], were calculated based on the heat capacity measurements. The standard molar enthalpy of formation of [Nd(Gly)2Cl3·3H2O] was determined to be (−3081.3 ± 1.1) kJ · mol−1 in terms of an isoperibol solution-reaction calorimeter.Figure optionsDownload full-size imageDownload as PowerPoint slide