The direct electrocheimical synthesis of Co(II), Ni(II), and Cu(II) complexes of some pyridiniethione derivatives

Anodic oxidation of Co, Ni and Cu in an anhydrous acetone solution of pyrid ine-2-(1H)-thione-3-cyano-4,6-dimethyl-5-(phenylazo) (HL1) and its derivati ves, pyridine-2-(1H)-thione-3-cyano-4,6-dimethyl-5-(4-chlorophenylazo) (HL2 ), pyridine-2- (1H)-thione-3-cyano-4,6-dimethyl-5-(4-methylphenylazo) (HL3) pyridine-2-(1H)-thione-3-cyano-4,6-dimethyl-5-(4-bromophenylazo)(HL4), pyr idine-2-(1H)-thione-3-cyano-4-methyl-6-phenyl-5- (4-phenylazo)(HL5), pyridi ne-2-(1H)-thione-3-cyano-4, 6-dimethyl-4-methyl-6-phenyl-5-(4-chlorophenyla zo) (HL6) and (HL6) and pyridine-2-(1H)-thione-3-cyano-4-methyl-6-phenylazo ) (HL7) yields complexes of the compositions M(L)(2), [M(L)(2). (H2O)(2)] a nd M(L)(2).(acetone)(2), where M = Co(II), Ni(II) or Cu(II) and L is the li gand. Chemical and thermal analyses as well as infrared and electronic spec tral data are presented to confirm the formulation of the complexes. The sp ectral data show that the ligands are coordinated to the metal via the thio enol sulfur atom and the nitrogen atom of cyano groups.