Synthesis,Characterization,Thermal Decomposition Mechanism and Non—Isothermal Kinetics of the Pyruvic Acid—Salicylhydrazone and Its Complex of Prasseodymium（Ⅲ）

摘要

The pyruvic acid-salicylhydrazone and its new complex of Pr(Ⅲ） were synthesized.The formulae C10H10N2O4(mark as H3L)and [Pr2(L)2(H2O)2]·3H2O(L=the trad from of the pyruvic acid salicylhydrazone[C10H7N2O4]3-)were determined by elemental and EDTA volumetric analysis.Molar conductance,IR,UV,X-ray and 1H NMR were carried out for the characterizations of the complex and the ligand.The thermal decompositions of the ligand and the complex with the kinetic study were carried out by nonisothermal thermogravimetry.The Kissinger’s method and Ozawa’s method are used to calculate the activation energy value of the main step decomposition.The stages of the decompostions were identified by TG-DTG-DSC curve.The non-isothermal kinetic data were analyzed by means of integral and differential methods.The possible reaction mechanism and the kinetic equation were investigated by comparing the kinetic parameters.