Synthesis, characterization and biological studies of transition metal complexes of Mn(II), Cu(II) and Zn(II) with an azo dye (E)-4-((2, 6-dihydroxyphenyl) diazenyl)benzoic acid

The present work includes the synthesis and characterization of complexes of (E)-4-((2, 6-dihydroxyphenyl)diazenyl)benzoic acid with metal ions Mn(II), Cu(II) and Zn(II) and characterized by elemental analysis, spectroscopic data including FT-IR, 1H-NMR and electronic spectra. It has been found that the azodye behaves as a neutral bidentate N, O donor which chelates with the metal ions Cu(II) and Mn(II) in 1: 2 and with Zn(II) in 1: 1 stoichiometry. Magnetic moment and electrolytic conductance data confirms this. The azodyes and complexes were screened for antimicrobial activity. The ligand and the complexes show better antimicrobial activity.