The aspect on novel azo disperse dyes containingimmidazol-5-one moiety has been undertaken.The hydroxyl benzilidene containingimidazol-5-one has been prepared and use as a coupler for the novel azodisperse dyes. All the resulted novel azo disperse dyes have beencharacterized by spectral properties and the dyeing properties as disperse dyeshave been assessed on polyester and nylon fibres. These dyes have been foundto give a range of yellow to reddish orange shades with very good depth andlevelness on each fibre. The percentage dye bath exhanstion and fixation ondifferent fibres has been found to be reasonably good and acceptable. The dyedfibres show fair to good fastness to light, washing and rubbing.
Keywords: Imidazol-5-one, IR, NMR, elemental analyses, dyeing,fastness properties.
Introduction:
Azo dyes account for more than half the total of dispersedyes and now a days cover virtually the whole of the spectrum. These dyes aremostly based on aromatic amines, benzidine derivatives and naphthalene baseddiazo compound1. Recently most of the benzidine based dyes have beenbanned all over the world due to their carcinogenic and toxic nature2.Some of the dyes based on heterocyclic rings system possess high tinctorialpower and excellent fastness properties3. Certain heterocyclic whichcouple in homocyclic ring are found to the more bathochromic than thecorresponding and uncyclised compounds because of increased electron donationby the terminal nitrogen atom 4. Imidazole derivatives have been extensivelyinvestigated for both colourant and pharmaceutical end use5. Veryrecently few synthesis and application of azo disperse dye derived fromimidazole moiety have been reported6-7.
About the Authors
VishalkumarA. Patel is a correspondence author and is associated with V.P. &R.P.T.P. Science College, Chemistry Department, Gujarat .Dhirubhai J. Desai andKanuprasad D. Patel are associated with V.P. & R.P.T.P. Science College,Chemistry Department, Gujarat
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