Abstract

CAIFENG, BI et al. SYNTHESIS AND THERMAL DECOMPOSITION KINETICS OF LANTHANUM(III) COMPLEX WITH UNSYMMETRICAL SCHIFF BASE. J. Chil. Chem. Soc. [online]. 2007, vol.52, n.4, pp.1291-1293. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072007000400004.

A new unsymmetrical solid Schiff base (LLi) was synthesized using L-lysine, salicylaldehyde and furfural. Solid lanthanum(III) complex of this ligand [LaL(NO₃)]NO₃-2H₂0 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 : da/dt = A · e^-ElRT. (1-a)² y The kinetic parameters(Δ, A), activation entropy ΔS* and activation free-energy ΔG* were also gained, E = 212.7 kJ/molΔlnLA =44.12, ℘S*=116.8 J/mol-KΔΔG*=148.1 kJ/mol

Keywords : Unsymmetrical Schiff base; La(III) complex; Thermal decomposition; Non-isothermal kinetics.