Publisher: Chemical Society of Nigeria

Dyeing and Ultraviolet Spectroscopic Properties of Heterocyclic Dyes

N. S. Gin, K. A. Bello, D. E. A. Boryo, C. G. Akubuilo, O. Elesho
KEYWORDS: Monoazo disperse dyes, Diazotization, exhaustion, extinction coefficient

ABSTRACT:

,  . Six  mono  disperse  dyes  were  synthesized  using  heterocyclic  amines  by  the  process  of  diazotization  and  coupling. The  mono  disperse  dyes  based  on  2-amino-6-methane  sulphony-benzothiazole  and  2-amino-5ethylthiol-1,3,4thiadiazole  were  synthesized  using  1-naphthol,  2-naphthol  and  N,N-bis-[2-cynoethyl]  aniline  as  the  coupling components.  The  different  properties  of  the  dyes  such  as  yield,  melting  point,  molecular  weight,  and  molar extinction  coefficient,  degree  of  exhaustion  and  wash  fastness  properties  on  nylon  were  analyzed.  A  gamut  of colour  shades  ranging  from  pink  to  purple  were  obtained  by  applying  the  variously  substituted  dyes  on  a  nylon fabric.  The  effects  of  application  conditions  such  as  temperature  and  time  on  dye  exhaustion  were  also investigated.  The  result  shows  that  the  dyes  have  very  good  extinction  coefficient  and  excellent  wash-fastness  and therefore  can  be  of  commercial  significance.


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