Thermal properties of solid complexes with biologically important heterocyclic ligands

Abstract

The stoichiometry of thermal decomposition of the complexes Co(NCS) 2 (fpy) 4 (I), Co(NCS) 2 (Mefpy) 4 (II) and Co(NCS) 2 (bfpy) 4 (III) (where fpy = furo[3,2-c]pyridine, Mefpy = methylfuro[3,2-c]pyridine, bfpy = benzo-[2, 3]furo[3,2-c]pyridine) have been investigated in nitrogen atmosphere from room temperature (RT) to 800 °C by means of TG and DTA. The results revealed that release of heterocyclic ligands occurs in one step. Infrared data suggested that fpy, Mefpy and bfpy were coordinated to Co(II) through the nitrogen atom of the respective heterocyclic ring and anionic ligands through nitrogen atom of the NCS groups.