Authors:Marleen L. B. F. Hereygers and H. O. Desseyn
Oxathioamidates (CSNR1R2COOKR1=R2=H (A),R1=H andR2=CH3 (B),R1,=R2=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 MA2(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.
Authors:K. Chrissafis, M. Lalia-Kantouri, and P. Aslanidis
The interaction of heterocyclic thiones with many transition metals has been an intense area of study for the last few decades, as certain of these thioamides have shown interesting biochemical properties or are
Authors:P. Aslanidis, K. Chrissafis, and M. Lalia-Kantouri
, recorded in the range 4,000–250 cm −1 contain the characteristic four “thioamide bands” (1,562, 1,825, 985, and 732 cm −1 ), required by the presence of the heterocyclic thione ligands, with shifts due to coordination indicative of an exclusive S
Authors:P. Aslanidis, V. Gaki, K. Chrissafis, and M. Lalia-Kantouri
the C=S bond of the thiones [ 6 , 7 , 16 ].
The infrared spectra, recorded in the range 4,000–250 cm −1 , contain the characteristic four “thioamide bands” (1562, 1825, 985, and 732 cm −1 ), required by the presence of the heterocyclic
Authors:Viorel Cîrcu, Ana S. Mocanu, Constantin Roşu, Doina Manaila-Maximean, and Florea Dumitraşcu
groups (carbonyl and thioamide), reacting with transition metals mostly in monoanionic and bidentate form by deprotonation resulting neutral complexes with S,O-coordination [ 13 – 15 ]. Only few other studies concerning liquid crystals incorporating N