Preparation, properties and structural characterization of 2-oxathioamidate complexes
作者:Marleen L.B.F. Hereygers、Herman O. Desseyn、John C. Plakatouras、Spyros P. Perlepes、Koen A.F. Verhulst、Albert T.H. Lenstra
DOI:10.1016/s0277-5387(00)83039-9
日期:1994.3
The reactions of potassium 2-thiooxamate (K+HL-) and potassium N-methyl-2-thiooxamate (K+HA-) with divalent metal ions yield a variety of products. The anions HL- and HA- behave as O,S bidentate chelating ligands, while L2- and A2- act as O,N/O,S bis-bidentate bridging ligands yielding polymeric complexes. The crystal structures of trans-[Mn(HL)2(H2O)2], trans-[Cd(HL)2(H2O)2] and cis-[Mn(HA)2(H2)2].H2O have been solved. Some properties of the complexes prepared are also described.
Thermal analysis of oxathioamidate complexes
作者:Marleen L. B. F. Hereygers、H. O. Desseyn
DOI:10.1007/bf01982694
日期:1996.7
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 ring systems with divalent metals (M(II)=Mn, Fe, Co, Ni, Cu, Zn). Vibrational spectra and thermal analysis provide information on the amount and 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. (crystal field stabilization energy) for weak field octahedral complexes. The complexes with ligand A and B decompose to form polymers by deprotonation on the thioamide group. The proposed structures are confirmed by the vibrational spectra. For ligand C no stable intermediates are formed during heating, degradation proceeds until metal sulphide remains.