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1 Polish Journal of Chemistry

1 2007

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Synthesis, Characterization and Biopotency of Some Metal(II) beta-Ketoiminates and Their Mixed-ligand Complexes

Osowole A. A., Fagade O. E.

Polish Journal of Chemistry

2007

Vol. 81, nr 12

2039-2048

VO(IV), Co(II) and Cu(II) complexes of beta-ketoimine [C6H5COH:CH(CH3)C:N(C6H4)Cl] and their mixed-ligand complexes with 2,2c- bipyridine (bipy) and 1,10-phenanthroline (phen) have been syn the sized and characterizedby elemental analysis, magnetic susceptibility, conductance, infrared and electronic spectral measurements. The ligand is bidentate, coordinating via the imine N and enolic O atoms. The magnetic moments and electronic spectra measurements corroborate a tetrahedral and square planar geometry for Ni(II) and Cu(II) complexes, the VO(IV) complex is five-coordinate square pyramidal while the Co(II) complex and the mixed- ligand complexes are six-coordinate, octahedral. The compounds are magnetically dilute and none is an electrolyte. The antimicrobial properties of these compounds against S. aureus, Bacilus subtilis, Bacillus cereus, Proteus sp, Klebsiella sp, Pseudomonas sp, and Salmonella spp are found to be generally good. The compounds, [VO(L)2], [VO(L)2(phen)] and [Co(L)2(bipy)] have comparable activity to Ciprofloxacin, a broad spectrum antibiotic. The minimum inhibitory concentrations (MICs) of the sen si tive compounds are between 3.0 and 9.0 mg/mL.