Synthesis and spectral characterization of metal complexes of 1-(2-hydroxy-4-methylphenylazo)-2-naphthol

Abstract

The o,o'-dihydroxyazo dye, 1-(2-hydroxy-4-methylphenylazo)-2-naphthol (HMPAN), and its metal complexes (chromium, cobalt, and iron) having the ligand to metal ratio 2: 1 have been synthesized, but manganese forms a 1: 1 complex. The spectral characterization of HMPAN and its complexes by IR, UV-VIS, H-1 and C-13 NMR spectroscopic techniques, and elemental analyses are reported.