Some Metal(II) Complexes of O-Aminoacetophenone Benzoylhydrazone (Aabh): Their Preparation, Characterization and Antimicrobial Activity

Abstract

The synthesis and characterization of some complexes of Cu(II), Co(II), Ni(II), and Cd(II) with o-aminoacetophenone benzoyl hydrazone (AABH) were prepared. Elemental analyses, molar conductivities, pH-titrations, magnetic measurements and spectral (IR, UV, NMR and MS) studies have been used to elucidate the structure of the metal complexes. The IR spectra show that the ligand coordinates in the keto and/or enol forms. The formation constants of the Cu(II), Co(II), Ni(II) and Cd(II) complexes in solution were studied potentiometrically and spectrophotometrically. Spectral studies in solution show that the ligand could be used for the microdetermination of Cu(II), Co(II) and Ni(II) ions within a concentration up to 44.4, 34.7 and 53.2 ppm of metals, respectively. The antimicrobial activity of AABH and its Cu(II), Co(II), Ni(II), and Cd(II) complexes illustrates that all of the complexes have antimicrobial activity except the complexes of Cu(II) and Co(II) which seemed inert against Escherichia coli.