Synthesis and Dyeing Performance of Various Novel 1,3,4-Oxadiazole Based Reactive Dyes

This paper is concerned with the synthesis and evaluation of different novel bisazo reactive dyes derived from 2,5-Bis(4-aminophenyl)-1,3,4-oxadiazole by using various cyanurated coupling components. Their dyeing performance as reactive dyes has been assessed on silk, wool and cotton fibres. These dyes are found to give yellow to purple shades upon dyeing, with very good depth, levelness and brightness on the fibres. These dyes are characterized by infrared (IR) and ¹H NMR spectral studies, visible absorption spectra and an elemental analysis. The percentage dyebath exhaustion and fixation are found to be very good and acceptable. The dyed fibres show moderate to very good light fastness, and good to excellent washing and rubbing fastness properties. The absorption characteristics of the dyes in different solvents have also been examined in detail.