THE EFFECT OF SUBSTITOENTS ON PROPERTIES OF MONOAZO DYES DERIVED FROM H-ACID
THE EFFECT OF SUBSTITOENTS ON PROPERTIES OF MONOAZO DYES DERIVED FROM H-ACID
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Date
1994-05
Authors
OWETE, VALERIE OBIAJULU
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Abstract
A variety of azo dyes were synthesized based on H- acid (1-
amino,8- naphthol, 3,6- disulphonic acid ) coupled to diazotised
aniline and its substituted derivatives.
Electron releasing substituents - acetyl, benzoyl and
paratoluene sulphonyl groups - were introduced into the amine group
of the coupling component and aniline derivatives containing
various electron withdrawing groups were used as the diazo
components.
The structural features of the dyes synthesized were
ascertained by the analysis of their individual I.R. (infrared)
spectra, measured in paraffin.
The effect of different substituent groups on the colour of
the dyes synthesized were studied by measuring the relative change
of wavelength of maximum absorption in distilled water, and the
solvatochromic effects in dimethyl formamide.
The fastness properties of the dyes on Nylon 6.6 (woven) were
also investigated.
Results obtained showed the N- paratoluene sulphonyl groups as
having the highest electron releasing strength resulting in marked
bathochromic shifts. Marked trends were not observed for the
various diazo ring substituents due to the interplay of steric
hindrance and non-planarity of dyes formed.
N- benzoylated H- acid dyes showed high wash, perspiration
and light fastness properties due to intra molecular aggregation. viii
N- acetylated H- acid favoured high perspiration and light fastness
properties due to weak electron releasing strength which increases
the dye's inherent stability.
Description
Being a Thesis submitted to post graduate school
in partial fulfilment of the
requirements for the
award of Master of Science (M.Sc) Degree in
Textile Science and Technology,
Ahmadu Bello University,
ZARIA,
Department of Textile Science & Technology,
Faculty of Science,
Ahmadu Bello University,
Zaria.
MAY 1994
Keywords
SUBSTITOENTS,, MONOAZO,, DYES,, DERIVED FROM H-ACID