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Synthesis and spectroscopic studies of alkali clearable azo dye of 3-amino-5-nitrophthalic acid.

Mallikarjuna Rajappa Halli, J.Keshavayya, K.M.Mahadevan, M.N.K.Harish, K.Venugopal Reddy

The present work describes the synthesis of alkali clearable azo dye stuffs (6a-c) derived fromnaphthanilides. The dyes (6a-c) were synthesized from 3-amino-5-nitro-phthalic acid (3,5-ANPA) as diazo component and 3- carboxy-2-hydroxy naphthanilides (5a-c) as coupling agent, under suitable experimental conditions. The dyes were characterized by using FT-IR, 1H and 13C NMR,UV-Visible, fluorescent and LC-MS techniques. The thermal behavior of compounds have been determined by means of differential thermal analysis (DTA) and thermo gravimetric analysis (TGA). The electrochemical properties of dyes were studied by cyclic voltametry.