Synthesis, characterization and thermodecomposition kinetics of Sm(III) complex with unsymmetrical Schiff base zwitterion ligand

A new unsymmetrical Schiff base zwitterion (LLi) was synthesized using L-lysine, salicylaldehyde and 2-hydroxy-1-naphthaldehyde. Samarium(Ell) complex of this ligand [SmL(NO3)]NO3 center dot 2H(2)O has 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 d alpha/dt= 3/2Ae(-E/RT)(1-alpha)(2/3)[1 -(1 -alpha)(1/3)](-1). The kinetic parameters (E, A), activation entropy Delta S-not equal and activation free-energy Delta G(not equal) were also gained.