Shaanxi key laboratory of Physico-Inorganic Chemistry Department of Chemistry, Northwest University Xi'an Shaanxi 710069 People's Republic of China E-mail Xi'an Shaanxi 710069 People's Republic of China E-mail
The reaction thermodynamic and kinetic equations for the non-reversible reactions are established. The enthalpy change of
formation reaction of manganese(II) histidine (His) complex in water has been determined by microcalorimetry, using manganese
chloride with L-a-histidine at 298.15-323.15 K. The standard enthalpy of formation of Mn(His)22+(aq) has been calculated. On the basis of experimental and calculated results, three thermodynamics parameters (the activation
enthalpy, the activation entropy and the activation free energy), the rate constants, along with three kinetic parameters
(the apparent activation energies, the pre-exponential constant and the reaction order) are obtained. The results show that
the reaction easily takes place over the studied temperature range. The solid complex Mn(His)2Cl24H2O was prepared and characterized by IR and TG-DTG.