Thin layer chromatography (TLC), elemental tests, magnetic moment, conductivity measurements, UV-Vis., IR and ESI-MS spectral studies were synthesised and characterised by a new Schiff base Co(II) complex and - peroxo complex. The cobalt ion during the single pot reaction was involved in direct complexation with the Schiff base (SB) ligand derived from o-aminobenzoic acid and cinnamaldehyde. IR spectral data showed that the Schiff base ligand was coordinated by azomethine group nitrogen and carboxyl group oxygen to the metal ion (COO-). The values of molar conductance showed that both complexes are of a non-electrolytic nature. Four pathogenic bacteria, namely Staphylococcus aureus, Bacillus cereus, Escherichia coli & Shigella dysenteriae with standard Kanamycin-30, were tested for the antibacterial activity of the complexes. The findings showed that both forms of complexes have moderate to heavy antibacterial activity and that all studied species have a comparatively greater capacity for the peroxo complex.
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