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 M2L′2L″2;ML′2L″2 (M=Fe, Cu, Zn; L′=2-oxocyclopentane dithiocarboxylate; L″=pyridine, morpholine) and CuL′2H2O was prepared afresh. Except the iron complex, all are dimer and complexation is through the dithio moiety of the ligand L′. Their thermal decomposition was carried out in air at heating rate 10°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-oxocyclopentanedithiocarboxylato 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

Keywords:

• Zinc
• Dimer
• Pyridine
• Copper
• Morpholine
• Inorganic chemistry
• Ligand
• Thermogravimetric analysis
• Thermal decomposition
• Chemistry

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