Thermal decomposition study of platinum(II) and palladium(II) thiosaccharinate complexes with supporting diphosphine or bipyridine ligands

The thermal behavior of mixed ligand complexes of platinum (ii) and palladium(ii) thiosaccharinate (tsac) with diphosphine or bipyridine ligands was studied by thermogravimetry,tg,and differential thermal analysis,dta. the platinum complexes showed higher thermal stability than the corresponding palladium complexes. platinum complexes start decomposition in the molten phase and undergo decomposition in two distinct steps where the tsac ligands are lost first followed by the diphosphine ligand which needed higher temperatures. for the corresponding palladium complexes,the two processes are overlapped. the decomposition was exothermic in general with few exceptions. the coordination of palladium with bipyridine (bpy) ligand gives a unique thermal behavior where only one tsac ligand is lost first followed by half tsac. such a behavior suggested a dimerization process. the dimer may comprise of two palladium ions with two bpy groups and one tsac group,which finally decomposes into pdo,in a highly exothermic process. the tg data was used for the study of chemical kinetics of the decomposition reactions with the aid of the most recently available formulae. the method is based on plotting a function of the weight loss extent against reciprocal temperature and the plot of the highest correlation coefficient is considered for the optimum reaction order and the activation energy. both reaction order and the activation energy can be estimated for the studied complexes. © 2017,university of mohammed premier oujda morocco.