Synthesis, characterization and luminescent properties of mixed ligand complexes of nickei(II) with 1,1-dicarboethoxyethylene-2,2-dithiolate and some nitrogen donors

Department of Chemistry, Tripura University, Suryamaninagar-799 022, Tripura, India E-mail : maheshkumar _ singh@rediffmail.com Department of Chemistry, Govt. General Degree College, Dharmanagar, Tripura (N), India Manuscript received 25 February 2011, revised 05 May 2011, accepted 20 June 2011 Mixed ligand complexes of NiII ion with 1,1-dicarboethoxyethylene-2,2-dithiolate [DED2- = {S2C=C(COOC2H5)2}2-) as a primary ligand and a-phenylenediamine (OPD), pyridine (py), α-picoline (α-pic), β-picoline (β-pic) or y-picoline (y-pic) as secondary ligands have been isolated and characterized by analytical data, molar conductance, magnetic susceptibility, electronic, infrared and fluorescence spectral studies. The molar conductance data reveal that the complexes have non-electrolytic nature in DMF solution. Magnetic and electronic spectral studies suggest distorted octahedral stereochemistry around NiII ion in its complexes. Infrared spectral studies suggest bidentate chelating behaviour of DED2- ion and OPD while other ligands show unidentate behaviour in their complexes. These complexes show fluorescence at room temperature in solid state