Synthesis and performance studies of novel bisazo reactive dyes on various fibres

A demand for novel reactive dyes with improved properties have led to synthesis of cold brand reactive dyes by coupling tetrazotised 4,4'-methylene bis-2,5-dimethoxy aniline with various cyanurated coupling components such as H-acid, Chicago acid, K-acid, J-acid, N-methyl J-acid, N-phenyl J-acid, Gamma acid, N-methyl Gamma acid, Peri acid, N-phenyl peri acid, Tobias acid, Sulpho tobias acid, Laurent acid, Bronner's acid, Koch acid and their dyeing performance as reactive dyes has been assessed on cotton, wool and silk fibres. The purity of dyes was checked by Thin Layer Chromatography. The IR spectra showed all characteristic bands and H-1 NMR spectra of representative dye showed all the expected signals. The percentage dye bath exhaustion on different fibres was good. The dyed fibres showed moderate to very good fastness to light, washing and rubbing.