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 Ni^II ion with 1,1-dicarboethoxyethylene-2,2-dithiolate [DED^2- = {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 Ni^II ion in its complexes. Infrared spectral studies suggest bidentate chelating behaviour of DED^2- ion and OPD while other ligands show unidentate behaviour in their complexes. These complexes show fluorescence at room temperature in solid state.