Synthesis and characterization of mixed ligand complexes of cobalt(II) with some nitrogen and sulfur donors

Mixed ligand complexes of Co(II) with nitrogen and sulfur donors, Co(OPD)(S-S) · 2H2O and Co(OPD)(S-S)L2 [OPD = o-phenylenediamine; S-S = 1,1-dicyanoethylene-2,2-dithiolate (i-MNT2-) or 1-cyano-1-carboethoxyethylene-2,2-dithiolate (CED2-); L = pyridine (py), α-picoline (α-pic), -picoline (-pic), or -picoline (-pic)], have been isolated and characterized by analytical data, molar conductance, magnetic susceptibility, electronic, and infrared spectral studies. The molar conductance data reveal non-electrolytes in DMF. Magnetic moment values suggest low-spin and high-spin complexes. The electronic spectral studies suggest distorted octahedral stereochemistry around Co(II) in these complexes. Infrared spectral studies suggest bidentate chelating behavior of i-MNT2-, CED2-, or OPD while other ligands are unidentate in their complexes.