Thermal analysis of heterocyclic thione donor complexes. Part III. Cobalt(II) complexes of imidazolidine-2-thione

The thermal decomposition of the cobalt(II) complexes of imidazolidine-2-thione (Imdt), Co(Imdt)₂X₂ (X = Cl, Br, and I) have been studied in air and argon by means of TG and DTG as well as in nitrogen by DTA. Decomposition schemes have been proposed for the complexes in both air and inert atmospheres. Reaction enthalpies have been derived from the melting and decomposition endotherms by means of quantitative DTA. A mean coordinate bond dissociation energy, D?, has been estimated for the Co-Imdt bond in the chloro complex. Reaction products in air have been identified by X-ray powder diffraction.