Novel Naphthalimide Based Azo Disperse Dyes for Dyeing of Polyester Fabrics

A series of monoazo disperse dyes based on naphthalimide was synthesized using N-alkylcarboxylic acid-1,8-naphthalimide as diazo component and N,N-diethylaniline derivatives as a coupling components. 4-amino-N-ethanoic (propanoic) acid-1,8-naphthalimide was synthesized from 4-nitro-1,8-naphthalic anhydride by imidation and subsequent reduction reactions. These compounds were diazotized and further coupled to substituted N, N-diethylaniline to produce dyes which give red to violet hues on polyester fabrics. The prepared dyes and their corresponding intermediates were characterized by elemental analysis, DSC, FTIR, 1HNMR and UV-Vis spectroscopic techniques. The dyed polyester fabrics showed moderate light fastnesses, very good to excellent washing, rubbing and sublimation fastnesses.