Synthesis, characterization and thermal decomposition kinetics of Sm(III)complex with 2,4-dichlorobenzoate and 2,2′-bipyridine

The complex of [Sm(2,4-DClBA)3(bipy)]2 (2,4-DClBA, 2,4-dichlorobenzoate; bipy, 2,2′-bipyridine) was synthesized and characterized by elemental analysis, molar conductivity, IR and UV spectra. The thermal decomposition process of the complex was studied by means of TG-DTG and IR techniques. And its thermal decomposition kinetics was investigated via the analysis of the TG-DTG curves by jointly using double equal-double steps method and nonlinear integral isoconversional method. The activation energy E, the pre-exponential factor A and the most probable mechanism functions of the first decomposition stage were obtained. Meanwhile, the thermodynamic parameters (ΔH≠, ΔG≠ and ΔS≠) were also calculated. The lifetime equation at weight-loss of 10% was deduced as ln τ = −35.53 + 20200/T by isothermal thermogravimetric analysis.