A.A. Osowole, S.A. Balogun
European Journal of Applied Sciences 4 (1): 06-13, 2012
ISSN 2079-2077 © IDOSI Publications, 2012
Abstract
The Schiff base, 2-(Indan-4-yliminomethyl)-6-methoxy-phenol and its Mn(II), Co(II), Ni(II), Cu(II),
Zn(II) and Pd(II) complexes were synthesized and characterized by microanalysis, magnetic susceptibility, conductance, thermal, infrared and electronic spectral measurements. The ligand was bidentate, coordinating through the phenolic O and imine N atoms. The Mn(II), Co(II) and Zn(II) complexes were formed as [ML(NO )] 3 while Ni(II), Cu(II) and Pd(II) complexes were isolated as [ML ]. Spectroscopic and magnetic data were 2 consistent with the adoption of tetrahedral/square planar geometry for the Cu(II), Zn(II), Ni(II) and Pd(II) complexes. The complexes were all magnetically diluted and monomeric with exceptions of the Mn(II) and Co(II)
complexes which were magnetically concentrated. They were isolated as air-stable powdery solids with high melting points, which decomposed on programmed heating mostly to the metals. The antibacterial activities of the ligand and its complexes against five Gram negative (Enterobacter cloacae, Salmonella arizonae, Serratia sp. Escherichia coli and Pseudomonas sp.) and three Gram positive (Staphylococcus aureus, Chromobacter violaceum and Bacillus sp.) bacteria were reported. The Cu(II) and Co(II) complexes had broad-spectrum activity like gentamycin (17.0-50.0 mm), although much lower, with inhibitory zones range of 7.0-14.0 and 7.0-20.0 mm respectively.