Synthesis,spectroscopic, magnetic,conductometric and electro-chemical investigations of nickel(II)-1-phenyl-4,6-dimethylpyrimidine-2-thione complexes |
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Authors: | Gianantonio Battistuzzi Marco Borsari Daniela Dallari Raffaele Battistuzzi |
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Affiliation: | (1) Department of Chemistry, University of Modena, 41100 Modena, Italy |
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Abstract: | Summary Tris-, bis- and mono-ligand complexes of NiII with 1-phenyl-4, 6-dimethylpyrimidine-2-thione (L) having the general formulae NiL3X2·2H2O (X = ClOinf4p–, BFinf4p–), NiL2X2 (X = Cl–, Br–, SCN– or NOinf3p–), NiL2X2·EtOAc (X = Br– or I–), NiL2X2·H2O·EtOH (X = I– or NOinf3p–) and NiLCl2·3H2O, were synthesized and their structures deduced from i.r. and electronic spectra, and magnetic properties. The combined evidence is consistent with an octahedral coordination for the NiII ion in all the complexes, with the ligand acting as a bidentate N,S-chelating agent. Spectral evidence, conductivity data and electro-chemical results in DMF solution show that the complexes undergo solvolysis readily. Polarographic and c.v. data for the [NiL3](ClO4)2·2H2O complex and for the [Ni-(DMF)6](ClO4)2-L systems, at increasing ligand concentrations, have shown that in DMF solution the [Ni(DMF)6]2+ cation prevails and that the thiopyrimidine-containing species, [NiL(DMF)5]2+ (L = N-monodentate ligand) , can be formed only in the presence of a large excess of free ligand.Author to whom all correspondence should be directed. |
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