Synthesis, Characterization, Thermal Decomposition Mechanism and Non‐Isothermal Kinetics of the Pyruvic Acid‐Salicylhydrazone and Its Complex of Praseodymium (HE)

Abstract

Abstract The pyruvic add‐salicylhydrazone and its new complex of Pr(III) were synthesized. The formulae C 10 H 10 N 2 O 4 (mark as H 3 L) and [Pr 2 (L) 2 (H 2 O) 2 ]·3H 2 O (L= the triad form of the pyruvic acid‐salicylhydrazone [C 10 H 7 N 2 O 4 ] 3‐ ) were determined by elemental and EDTA volumetric analysis. Molar conductance, IR, UV, X‐ray and 1 H 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 non‐isothermal 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 decompositions 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.