Synthesis and thermal decomposition kinetics of Th(IV) complex with unsymmetrical Schiff base ligand

Summary

A new unsymmetrical Schiff base ligand (H₂LLi) was synthesized using L-lysine, o-vanillin and salicylaladyde. Thorium(IV) complex of this ligand [Th(H₂L)(NO₃)](NO₃)₂ ^.3H₂O have been prepared and characterized by elemental analyses, IR, UV and molar conductance. The thermal decomposition kinetics of the complex for the second stage was studied under non-isothermal condition by TG and DTG methods. The kinetic equation may be expressed as: dα/dt=A ^.e^-E/RT.1/2 (1-α)^.[-ln(1-α)]^-1. The kinetic parameters (E, A), activation entropy ΔS ^¹ and activation free-energy ΔG ^¹ were also calculated.