Thermochemical Study of a Mixed Ligand Complex of Neodymium Perchlorate with Glycine and L-Alanine

The Mixed ligand complex of Neodymium Perchlorate with Glycine and L-Alanine has been synthesized. Though the DTA,TG,chemistry analysis and comparing with literature, its form is {Nd 2(Gly) 5(Ala) 3(ClO 4) 62H 2O } n, and its purity is 98.75%. The dissolution enthalpies of the reactants and products in 2 mol·L -1 HCl solution (298.15 K) have been measured by using the isoperibol reaction calorimetry respectively. Δ rH m was calculated by a designed thermochemical cycle of the coordination reaction. From the results and other auxiliary quantities, the standard molar enthalpy formation of Nd 2(Gly) 5(Ala) 3(ClO 4) 6·2H 2O has been obtained to be Δ fH ○ -- m{ Nd 2(Gly) 5(Ala) 3(ClO 4) 6·2H 2O } =-7 020.46 kJ·mol -1.