UV and IR Characterization of Monoazo Disperse Dyes Synthesized from Aminobenzene and its Derivatives

Abstract

The potential of amino benzene and its derivatives in the synthesis of monoazo disperse dyes was studied. The dyes were synthesized by the diazotization of amino benzene and its derivatives and subsequent coupling with salicylic acid. The synthesized dyes were subjected to UV and IR characterization and the UV-VIS absorption spectra of the dyes in methanol, ethanol and ethyl acetate revealed that the dyes have absorption bands within the visible region of the electromagnetic spectrum and that the λmax of the dyes increases with increase in polarity of the solvents. The FTIR characterization of the dyes revealed the presence of C – O from phenol, C – N and N – H from amines, C – H from alkane, N = O from nitro compounds and – OH from alcohol and the proposed structures of the dyes revealed the presence of chromophoric, auxochromic and azodic groups which may help to explain why the dyes have excellent colourations. The dyeing and fastness properties of the dyes on nylon, wool, polyester and cotton revealed that the dyes will have commercial importance within the textile industries.