摘要:
Complexes [MLH6(NO3)(2)] (M = Cd, Hg) (1 and 2), [MLH4] (M = Hg, Zn) (3 and 5) and [ZnLH5NO3] (4) have been synthesised by reaction of benzilbisthiosemicarbazone LH6 with cadmium, mercury and zinc nitrates in ethanol. The X-ray diffraction study of cadmium complex 1 shows that the azomethine nitrogen atoms, the sulfur atoms and the nitrate groups are bonded to the cadmium atom giving, the first time for this kind of ligands, a distorted octahedral geometry. Complexes have been characterised by elemental analyses and mass spectra as well as by IR, H-1, C-13 and Cd-113 NMR and C-13 and Cd-113 CP/MAS NMR spectroscopies. In all complexes LH6 acts as a tetradentate N2S2 ligand. The electrochemical behaviour of complexes, studied by cyclic voltammetry, shows metal centred and ligand reduction processes for all of them. (C) 2001 Elsevier Science B.V. All rights reserved.