Synthesis And Application Of Heterocyclic Disperse And Acid Dyes Derived From 2-Aminothiophene And Conventional Amines As The Diazo Components

Heterocyclic disperse and acid dyes of low molecular weights derived from 2-aminothiophene and conventional amines as diazo components were successfully synthesized. The identity of these dyes and intermediate were investigated using spectroscopic analysis such as Uv-visible spectrometry Fourier Transform Infrared Spectrometry and GC-MS. The 2-aminothiophene intermediate and heterocyclic disperse dyes were synthesized using the method of Alaa and Tarek 2006 and the molar mass of the synthesized intermediate was 257 while that of the synthesized dyes ranges from 305 to 586 respectively. All the synthesized dyes absorbed within the visible region of the electromagnetic spectrum but the heterocyclic disperse dyes were more bathochromic than those of the conventional azo acid dyes. The dyes gave good exhaustion ranging from 70 to 85 on polyester fibre and chrome tanned leather. The dyes gave deep pink to orange shades on dyed substrates and exhibited good to excellent wash fastness properties and moderate to good light fastness on the dyed substrates.