Synthesis and Characterization of mixed ligand complexes of Co(II) ion with some N and S donor

Abstract

Mixed ligand complexes of Co(II) ion with some heterocyclic nitrogen donors and 1,1-dicyanoethylene-2,2-dithiolate of the compositions, Co(N-N) 2 (i-MNT), Co(N-N)(i-MNT).2H 2 O and Co(N-N)(i-MNT)L 2 [N-N = 1,10-phenanthroline, 2,2'-bipyridine ; i-MNT 2-= 1,1-dicyano-ethylene -2,2-dithiolate ; L = pyridine(py), -picoline (-pic), -picoline (-pic) or -picoline (-pic) have been isolated and characterized on the basis of analytical data, molar conductance, magnetic susceptibility, electronic and infrared spectral studies. The molar conductance data reveal non-electrolytic nature of the complexes in DMF. Magnetic moment values suggest low spin complexes. The electronic spectral data suggest distorted octahedral stereochemistry around Co(II) ion in these complexes. Infrared spectral studies suggest bidentate chelating behaviour of i-MNT 2-, 1,10-phenanthroline and 2,2'-bipyridine while other ligands show unidentate behaviour in their complexes. Keywords: Cobalt(II), 1,1-dicyanoethylene-2,2-dithiolate, Nitrogen donors, Mixed ligand complexes.