Synthesis, characterization, luminescent properties and biological activity studies of mixed ligand complexes of nickei(II) with sulphur and some nitrogen donors

Department of Chemistry, Tripura University, Suryamaninagar-799 022, Tripura, India

Department of Microbiology, Agartala Govt. Medical College, Agartala-799 006, Tripura (West), India Department of Chemistry, Govt. Degree College, Dharmanagar-799 251, Tripura (North), India

E-mail : arijitdas_chem@rediffmail.com

Manuscript received online 23 March 2012, revised 18 April 2012, accepted 19 April 2012

Mixed ligand complexes of Ni^ll ion with 1-cyano-1-carboethoxyethylene-2,2-dithiolate {CED²- = [S₂C=C(COOC₂H₅)(CN)]^2-} and heterocyclic nitrogen bases such as pyridine (py), α-picoline (α-pic),β picoline (β-pic) or ϒ-picoline (ϒ-pic) have been isolated and characterized by analytical data and physico-chemical techniques such as molar conductance, magnetic susceptibility, electronic, infrared and fluorescence spectral studies. The complexes do not decompose up to 300 °C and are only soluble in coordinating solvents such as DMF and DMSO. The molar conductance data of complexes in DMF solution show its non electrolytic nature. The magnetic moment values of the complexes indicate paramagnetic character corresponding to two unpaired electrons. Distorted octahedral stereochemistry around Ni^ll ion in these complexes have been proposed on magnetic and electronic spectral studies. Infrared spectral studies suggest bidentate chelating behaviour of CED^2- ion and unidentate behavior of nitrogen donors in these complexes.

Fluorescence study of the complexes show the binding of ligand to metal. These complexes also show antibacterial and antifungal activity in vitro.