Synthesis and application of 2-nitro-2',4'-dihydroxyazobenzene, 4-nitro-2',4' -dihydroxyazobenzene and 2 -carboxy -2' -hydroxyazonaphthol for dyeing of jute fabric

: The following three azo dyes namely, 2-nitro-2',4'-dihydroxyazobenzene (I), 4-Nitro-2',4'-dihydroxyazobenzene (II) and 2-carboxy-2'-hydroxyazonaphthol (III) have been synthesized and characterized. These three azo dyes have been successfully applied for dyeing of bleached jute fabric in alkaline medium following the conventional exhaust method. The performance of the dyes are evaluated by evaluating the colour yield and wash fastness of the dyed fabric samples.