Spectroscopic Investigation of New Schiff Base Metal Complexes

New transition metal complexes of Ni(II), Cu(II), Zn(II), and Ce(IV) with tetradentate (N2O2) Schiff base, CIP-o-phdn, (N,N'-o-phenylene (bis 1-cyclopropyl-6-fluoro-4-oxo-7-(piperazine-1-yl)-quinoline-3-carboxylic acid) have been prepared. Characterization of the ligand and its complexes is also reported. Their bonding and structures of the newly prepared were identified by elemental analysis, IR, UV-Vis, 1H NMR, mass spectra, magnetic moment measurements, conductivity as well as thermal analysis. The metal ions complete their six coordination with two coordinated water molecules forming a distorted octahedral geometry. The prepared compounds have antibacterial activity against two gram-negative bacteria; Escherichia coli and Pseudomonas aeruginosa and also against two gram-positive bacteria; Staphylococcus aureus and Bacillus subtilis. The activity data showed that the complexes are more potent antibacterial than the parent Schiff base and also the Schiff base more active than free ciprofloxacin.