SYNTHESIS AND PROPERTIES OF MONOAZO DYES DERIVED FROM ARYAMINES
SYNTHESIS AND PROPERTIES OF MONOAZO DYES DERIVED FROM ARYAMINES
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Date
1997-11
Authors
JULIANA, CHINEZE OBI
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Abstract
vi
ABSTRACT
The synthesis of azo dyes derived from different diazo components and
coupling components was undertaken and their spectroscopic properties in
different solvents (ethanol, toluene and acetone) were measured. The results
show that substituents have a marked effect on the colour of the azo dyes.
Some of the subtituents shift the max of the dyes bathochromically while
others cause a significantly hypsochromic shift in the max observed. The
max of the dyes in ethanol is higher compare to other solvents (i.e acetone
and toluene) due to high dielectric constant and hence more polar character of
the former.
Analysis of the synthesised dyes by i,r, comfirmed the different groups
present in the molecule. The effect of halochromism on the colour of the dyes
syntheised were examined and protonation of azo dyes occurs readily.
Finally, all the dyes synthesised were applied to polyester and nylon
fabric and their fastness characteristics assessed. It was found generally, that
the dyes are very resistant to wash fastness and are also found suitable for
transfer printing.
Description
BEING A THESIS SUBMITTED TO THE POSTGRATUATE
SCHOOL, IN PARTIAL FULFILLMENT OF THE REQUIREMENTS
FOR THE AWARD OF MASTER OF SCIENCE (M.Sc.) DEGREE IN
ORGANIC CHEMISTRY. AHMADU BELLO UNIVERSITY, ZARIA.
DEPARTMENT OF CHEMISTRY
FACULTY OF SCIENCE,
AHMADU BELLO UNIVERSITY,
ZARIA
NOVEMBER,
Keywords
SYNTHESIS, PROPERTIES, MONOAZO DYES, ARYAMINES