Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (08): 753-756.doi: 10.3866/PKU.WHXB20010818

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Thermochemical Study of Mixed-ligands Complexes of L-glutamic Acid and L-arginine Acid with Copper Ions

Qu Jing-Nian;Liu Yi;Li Lin-Wei;Qu Song-Sheng   

  1. Department of Chemistry, Heng Yang Teacher′s College, Hengyang 421008;School of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072
  • Received:2001-01-20 Revised:2001-03-26 Published:2001-08-15
  • Contact: Liu Yi

Abstract: The Mixedligands complexes of Lglutamic acid and Larginine with Cu(Ⅱ) was synthesized. The composition of the complex was determined by chemical analysis, element analysis and thermal gravity analysis. By solution calorimetry in a reaction calorimeter at 298.2 K,the dissolution enthalpy for the reactant, CuSO4 5H2O(s), LGlutamic acid(s) and LArginine(s), and the product, Cu稧lu稟rg稴O4 5H2O(s), were determined. They were dissolved in 2 mol稬-1 H2SO4 solution, respectively. A themochemistry cycle was designed, to obtain the coordinate reaction enthalpy change,=(19.745 0.033) kJ穖ol-1, and the standard formation enthalpy of the mixedligands complex was calculated,=(-3923.145 3.768)kJ穖ol-1. This result offers a basic thermochemistry parameter for the further research of this kind of compounds.

Key words: Amino acids, Mixed-ligands complexes, Calorimetry, Thermochemistry