Novel Schiff base and its two transition metal complexes derived from the condensation reaction of 2,6-diacetylpyridine with biguanide, characterized by 1H NMR, IR and elemental analysis. The ligand and its cobalt(II) and nickel(II) complexes showed potent DNA photo-cleavage activity. Antimicrobial activity of this Schiff base and its cobalt(II) and nickel(II) complexes against bacteria and fungi viz. S. aureus, K. pneumoniaae and A. niger, Trichophyton rubrum, respectively was evaluated in terms of zone of inhibition.

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