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In this work, we synthesized and characterized an azo dye of amino pyridine namely 6-[3- pyridylazo]-2,4-dichlorophenol (PADCP) furthermore its complexes of cobalt, nickel and copper divalent ions. The infrared spectra refereed that PADCP ligand coordinates by oxygen and nitrogen atoms to the metals in the complexes as bidentate ligand. The synthesized complexes have general formula [M(PADCP) 2 ] which confirmed by elemental analysis, magnetic moments, molar conductivity and electronic spectra. The synthesized complexes of PADCP have tetrahedral shape and non-ionic. The PADCP dye exhibit clear color changes under pH changes. The PADCP ligand and its complexes shown notable biological activity against  E.coli, Staph.aureus and Aspergillus Niger

Synthesis and characterization and biological study of pyridylazo ligand and its compounds of Co, Ni and Cu divalent ions