Thermodynamic study on complex of neodymium with glycine |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde, Hunan 41500, PR China;2. Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China;1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Material Science, Northwest University, Xi’an 710127, PR China;2. College of Pharmacy, Institute of Medicine, Xi’an Medical University, Xi’an, 710021, PR China;1. CICECO – Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal;2. CESAM – Centre for Environmental and Marine Studies, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal;3. Instituto Politécnico de Coimbra, ESTESC-Coimbra Health School, Complementary Sciences, 3046-854 Coimbra, Portugal;1. Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia;2. Pharmacy Australia Centre of Excellence, School of Pharmacy, The University of Queensland, Brisbane, QLD 4102, Australia |
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| Abstract: | 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. |
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| Keywords: | Rare-earth complex Low temperature heat capacity Standard molar enthalpy of formation Solution-reaction calorimetry |
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