Synthesis of S,S#x2032;- Bis (2-Benzimidazolylmethyl)Dithioglyoxime and Its Complexes with Nickel(II), Palladium(II), Cobalt(II), and Cobalt(III)

摘要

A new vicinal dioxiroe ligand with two 2-benzimidazolylmethyl groups, namely S,S#x2032;-bis(2-benzimidazolylroethyl)dithioglyoxime (H2L), has been prepared from cyanogen-di-N-oxide and 2-mercaptomethylbenz-imidazole in dichloromethane at -10#xB0;C. Nickel(II), palladium(II), cobalt(II) and cobalt(III) complexes of H2L have a metal : ligand ratio of 1 : 2 and the ligand coordinates through the two N atoms, as most of the vicinal dioximes. Co(HL)2(L#x2032;)Cl has been prepared with L#x2032; = pyridine, 2,6-dimethylpyridine, 2-mercaptopyridine, 2-car-boxypyridine, pyridine-2-carboxyaldehyde, triphenylphosphine, tri-phenylarsine, together with a chloride ion as axial ligands. All these complexes are slightly soluble in common organic solvents. Structures are proposed according to elemental analyses,1H,13C-NMR IR, and UV-Visible spectral data.