Synthesis of Monoazo Dyes From Halogenated Arylamines and Fastness Properties on Cotton and Nylon
Keywords:
azo dyes; solvatochromism; fastness properties; wavelength.Abstract
Some varieties of monoazo disperse dyes derived from halogenated arylamines were synthesized by simple diazotization and coupling to 1 and 2-naphthols. The impure dyes were recrystallized from ethanol solvent. Interestingly, all the dyes synthesized have colouristic properties. The purity and structural identities of the dyes obtained were confirmed by melting point, UV and IR spectrometry. The UV spectra of all the dyes synthesized revealed solvatochromism in solvent of different polarities and also halochromism. Fastness properties showed that all the dyes had better fastness properties on cotton than on nylon fabric, although deep dyeing was obtained on nylon fabric.
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