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Application of bisphenol as a coupler in the synthesis of azo dyes and its assessments on vegetable tanned leather

O.B.Agho, A.I.Okele, D.A.Adams, J.Obadahun, C.Enyeribe

Bisphenol-A has successfully been used as a coupler in the synthesis of some azo dyes with P-phenylenediamine and 4-aminophenol as the diazo components. The dyes exhibited a wide range of visible absorptions ranging from maroon to orange with characteristic absorption bands at 640.00 nm and 490.00 nm respectively. The results obtained from the calculation of the RF value indicates that the dye synthesized from 4-aminophenol is heavier with RF value 0.78 the dye synthesized from p-phenylenediamine serving as the diazo components has the least RF values 0.72 and 0.76 respectively. The fastness properties on dyed vegetable tanned leather showed very good fastness indicative of a great potential in future application of these dyes in colour technology.