2004•Chemical Research and ApplicationRequires access

Thermochemistry of L-cysteine complex Zn(II) sodium

QU Jing-nian, Liu Yi, Qu Song-Sheng

Abstract

A complex Na_2[Zn(Cys)_2]·5H_2O was synthesized and the composition of the complex was determined by chemical and thermogravimatric and infrared analysis. The molar dissolution enthalpy of the reactants and products were measured by classical solution calorimetry, the calorimetric solvent is 4 mol·L~(-1)HCl,at 298.2 K. Using a thermochemistry cycle, the standard molar formation enthalpy of complex Na_2[Zn(Cys)_2]·5H_2O has been calculated to be △_fHmNa_2[Zn(Cys)_2]·5H_2O(s)=-2828.323 kJ·mol~(-1).The result supplies a basic thermochemistry parameter for the further research of the complex.

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Available abstract

Key concepts: Thermochemistry, Calorimetry, Chemistry, Thermochemical cycle, Standard enthalpy of formation, Enthalpy, Reaction calorimeter, Enthalpy change of solution