Synthesis, characterisation and antimicrobial studies of nickel (II) mixed ligand complexes of ?-diketones with nitrogen-containing ligands

Abstract

A series of mixed-ligand Nickel (II) complexes of ?-diketones (dibenzoylmethane (dbmH), benzoylacetone (bzacH) and
acetylacetone (acacH) with 1,10-phenanthroline (phen), 2,2’-bipyridine (bipy) and Tetramethylethylenediamine (Tmen)
associated with NO3
– counter ion has been synthesised and characterised by conductance measurement, magnetic
susceptibility measurement, infrared spectroscopy, electronic spectroscopy and antimicrobial studies. The electronic
spectra studies are consistent with the adoption of probable octahedral geometry while the infrared spectra showed
characteristic NO3
– bands in all the complexes. Conductance measurement of the mixed ligand complexes indicated that
they were all non-electrolytes, with the ligands and anions within the coordination sphere. The complexes showed good
activity in most of the organisms but few were resistant in P. notatum, R Stolonifer and K. pneumonae.