Study of the Azo Hydrazone Tautomerism in the 4-(9-Anthrylazo) Phenol

Abstract

The spectroscopic study on 4-(9-anthrylazo) phenol has revealed that the azo dye under study exists in two tautomeric forms which are azo phenol and hydrazo keto forms in ratio of almost (1:1). The azo hydrazone tautomerism was confirmed by the use of IR spectroscopy and HNMR in which the characteristic absorption bands and chemical shifts for both tautomers were assigned. Keywords—Spectroscopic, tautomeric forms, azo hydrazone tautomerism, IR spectroscopy, HNMR.