Synthesis, characterization and antibacterial studies of tetradentate schiff base and their metal (II) complexes derived from 4-(Benzeneazo salicylaldehyde and ethylenediamine)

A tetradentate Schiff base was synthesized by the reaction of 4-(Benzeneazo) Salicylaldehyde and Ethylenediamine in their ethanolic solutions. The corresponding metal (II) complexes of the synthesized Schiff base were obtained by refluxing the ethanolic solutions of CoCl2, CrCl2, and MnCl2 salts. The physical properties of the Schiff base and its corresponding metal (II) complexes were investigated. The melting point temperature of the Schiff base was 200oC, while the decomposition temperatures of the complexes were 230 oC, 210 oC and 220 oC for Co (II), Cr (II), and Mn (II) complexes respectively. The magnetic susceptibility measurement reveals that all the complexes are paramagnetic in nature; the conductivity measurement shows that all the complexes are non-electrolytic in nature. The formation of the Schiff base and its metal (II) complexes were confirmed using FTIR spectroscopy. Both the Schiff base and its metal (II) complexes were found active against Staphylococcus aureus and Escherichia coli.Key words: Schiff base, metal complexes, magnetic susceptibility, conductivity, antibacterial.