Synthesis and thermal decomposition kinetics of Er(III) complex with unsymmetrical Schiff-base ligand

A new unsymmetrical, solid, Schiff base (H2LLi) was synthesized using L-lysine, o-vanillin and salicylaldehyde. An Er(III) complex of this ligand [Er(H2L)(NO3)](NO3) center dot 2H(2)O was prepared and characterized by elemental analysis, IR, UV and molar conductance. The thermal decomposition kinetics of the complex for the second stage was studied under non-isothermal conditions by TG and DTG methods. The kinetic equation may be expressed as, d alpha/ dt = A . e(-E/RT) . 1/2(1 - alpha)[ - ln(1 - alpha)](-1). The kinetic parameters (E, A), activation entropy S-not equal and activation free-energy G(not equal) were also determined.