Thermal decomposition kinetics of lanthanum complexes of 1,2-(diimino-4′-antipyrinyl)ethane

The kinetics and mechanism of the thermal decomposition of perchlorate, nitrate and io dide complexes of lanthanum with the Schiff base 1,2-(diimino-4′-antipyrinyl)ethane (abbreviated as GA) have been studied by TG and DTG techniques. The kinetic parameters like the activation energy, the pre-exponential factor and the entropy of activation were calculated for the major decomposition stages (Stages I and II) using Coats-Redfern equation. The rate controlling process obey 'Mampel model' with random nucleation with one nucleus on each particle. The kinetic parameters indicate that the ligands are loosely bound to metal ion and the activated complex formed in the decomposition reaction is more ordered than the reactants.