THERMAL ANALYSIS OF 2-OXOCYCLOPENTANEDITHIOCARBOXYLATO COMPLEXES OF IRON(III), COPPER(II) AND ZINC(II) CONTAINING PYRIDINE OR MORPHOLINE AS THE SECOND LIGAND

A series of ternary complexes of the types M2C'L-2 ''(2); ML'L-2 ''(2) (M=Fe, Cu, Zn; L'=2-oxocyclopentane dithiocarboxylate; L ''=pyridine, morpholine) and (CuC2H2O)-H-' was prepared afresh. Except the iron complex! all are dimer and complexation is through the dithio moiety of the ligand U. Their thermal decomposition was carried out in air at heating rate 10 degrees C min(-1) and it revealed that the dehydration of the aqua complex follows the same path as the carboxylates and the pyridine complexes have the tendency to follow one-step decomposition. The copper complexes are less thermally stable. The overall thermal stability of the 2-oxocyclo-pentanedithiocarboxylato complexes of the three metals with the volatile ligands was found to be in the order: (CuLmorph)(2)< CuL2H2O<(CuLPY)(2)<(ZnLmorph)(2)<(ZnLPY)(2)<FeL2PY2. The thermogravimetric properties of the complexes have been studied and the data were subjected to kinetic analysis. The values of n, E, A and Delta S-# have been approximated and compared. Any formation of bridged structure is not indicated in the first step case.