Synthesis and Spectral Characterization of Metal Complexes of 1‐(2‐Hydroxy‐4‐methylphenylazo)‐2‐naphthol

Abstract

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, 1H and 13C NMR spectroscopic techniques, and elemental analyses are reported.