Synthesis and Characterization of a Novel Benziloxime Ligand and Its Iron(III) and Nickel(II) Complexes

The synthesis of a novel benziloxime ligand, 4,4'-dibromobenzilmonoxime (DBBOH) (1) and its complexes [Fe(DBBO)(3)] (2) and Na[Ni(DBBO)(3)] (3) are described. The ligand (DBBOH) was prepared in MeOH from the reaction of 4,4'-dibromobenzil with hydroxylamine hydrochloride in the presence of sodium acetate. Reaction of sodium salt of 4,4'-dibromobenzilmonoxime (DBBONa) in MeOH with Fe(NO(3))(3) 9H(2)O and Ni(NO(3))(2) 6H(2)O yielded [Fe(DBBO)(3) (2) as yellow and Na[Ni(DBBO)(3)] (3) as brown precipitates respectively. The ligand, 4,4'-dibromobenzilmonoxime (DBBOH) (1) and its complexes [Fe(DBBO)(3) (2) and Na[Ni(DBBO)(3)] (3) were characterized by elemental analysis, (1)H-NMR and (13)C-NMR, IR, and electronic spectral studies The analysis of IR, (1)H- and (13)C-NMR spectral data of Fe(III) and Ni(II) complexes suggest that 4,4'-dibromobenzilmonoximate is bonded to iron(III) and nickel(II) ions through the oxygen atom of the carbonyl, and the nitrogen atom of the imine groups The electronic spectral data of the complexes in CHCl(3) are in good agreement with the octahedral coordination of Fe(III and Ni(II) ions. The ligand field parameters for these complexes, i.e splitting energy and Racah parameter were calculated to be 21560 cm(-1) and 707 cm(-1) for [Fe(DBBO)(3)] (2), 13440 cm(-1) and 610 cm(-1) for Na[Ni(DBBO)(3)] (3) respectively.