Some metal(II) complexes of o-aminoacetophenone benzoylhydrazone, (AABH): Their preparation, characterization and antimicrobial activity

The synthesis and characterization of some complexes of Cu(II), Co(II), Ni( II), and Cd(II) with o-aminoacetophenone benzoyl hydrazone (AABH) were prep ared. Elemental analyses, molar conductivities, pH-titrations, magnetic mea surements and spectral (IR, UV, NMR and MS) studies have been used to eluci date the structure of the metal complexes. The IR spectra show that the lig and coordinates in the keto and/or enol forms. The formation constants of t he Cu(II), Co(II), Ni(II) and Cd(II) complexes in solution were studied pot entiometrically and spectrophotometrically. Spectral studies in solution sh ow that the ligand could be used for the microdetermination of Cu(II), Co(I I) 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 ha ve antimicrobial activity except the complexes of Cu(II) and Co(LI) which s eemed inert against Escherichia coli.