THERMAL-ANALYSIS OF OXATHIOAMIDATE COMPLEXES

Oxathioamidates (CSNR(1)R(2)COOK R(1)=R(2)=H (A), R(1)=H and R(2)=CH3 (B), R(1)=R(2)=CH3 (C)) can act as O, S donors and form pentaatomic ri ng systems with divalent metals (M(II)=Mn, Fe, Co, Ni, Cu, Zn). Vibrat ional spectra and thermal analysis provide information on the amount a nd nature of associated water molecules. The dehydration of MA(2)(H2O) (2) (M=Mn, Fe, Co, Ni) can be very well explained by the C.F.S.E. (cry stal field stabilization energy) for weak field octahedral complexes. The complexes with ligand A and B decompose to form polymers by deprot onation on the thioamide group. The proposed structures are confirmed by the vibrational spectra. For ligand C no stable intermediates are f ormed during heating, degradation proceeds until metal sulphide remain s.