Preparation, Characterization and Antibacterial Activity of Some Metal ion Complexes

The Schiff base complexes derived from Salicylaldehyde and o- pheneylenediamine have been prepared and characterized using several physical techniques, in terms; elemental analysis, molar conductance measurements, thermogravimetric analysis, magnetic moment measurements, infrared, electronic and electron paramagnetic resonance spectra. The elemental analysis data exhibit the formation of 1:1[M: L] complexes. The molar conductance values reveal a non- electrolytic nature. The thermogravimetric analysis data of Cr(VI) complex show the presence of water molecules. The obtained magnetic moment values exhibit the existence of three unpaired electrons in the Cr(III) complex and a diamagnetic phenomenon for the other three complexes. The infrared spectral data display the coordination behavior of the Schiff base towards Cr(VI), Cr(III), Pb(II)) and TiO(IV) ions. The electronic absorption spectra of the Schiff base and its complexes show π→π* (phenyl ring), n→π* (HC=N) and the expected geometrical structure for the prepared complexes. The electron paramagnetic resonance spectral data satisfy the presence of a paramagnetic phenomenon and support the expected geometrical structure of Cr(III) complex. The Schiff base and its new complexes were tested for antibacterial activity against gram positive bacteria; Staphylococcus aureus and gram negative bacteria; Salmonella, Escherichia coli including the resistance bacteria Pseudomonas aeruginosa.