Thermodynamic Property Study on the Complexes of Rare- Earth Elements with Amino Aids

Abstract

In this chapter, the following three rare-earth complexes with amino acids, Eu(Glu) (Im) 5 (ClO 4) 3 Á3HClO 4 Á 6H 2 O, Nd(Gly) 2 Cl 3 Á3H 2 O, and La(Glu)(Im) 6 (ClO 4) 3 Á4HClO 4 Á4H 2 O, are synthesized and characterized by element analysis, infrared (IR) spectrum, and x-ray diffraction (XRD) analysis. The thermodynamic property studies on these complexes are performed. For the first one, Eu(Glu)(Im) 5 (ClO 4) 3 Á3HClO 4 Á6H 2 O, the low temperature heat capacity, phase transition, and thermodynamic functions are determined by adiabatic calorimetry. For the second one, Nd(Gly) 2 Cl 3 Á3H 2 O, the molar dissolution enthalpy and standard molar enthalpy of formation are determined by isoperibol solution reaction calorimetry. For the third one, La(Glu)(Im) 6 (ClO 4) 3 Á4HClO 4 Á4H 2 O, the microcalorimetry is used to investigate the interaction between the complex and the Escherichia coli DH5α to elucidate the biological effects of the complex.