THE EFFECT OF SUBSTITUENTS O N T H E S P E C T R O S C O P I C A N D DYEING PROPERTIES OF M O N O A Z O A N D METHINE DYES
THE EFFECT OF SUBSTITUENTS O N T H E S P E C T R O S C O P I C A N D DYEING PROPERTIES OF M O N O A Z O A N D METHINE DYES
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Date
1991-09
Authors
Adamu Kari, ISUWA
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Abstract
The synthesis of azo dyes derived from 2-aminothiazole
derivatives was undertaken and their spectroscopic properties in
different solvents examined. From the results of the
investigation, the incorporation of electron withdrawing group in
the acceptor ring of the chromogen gives a bathochromic shift of
the visible absorption band, while the incorporation of electron
donating group in the same position of the chromogen results in
hysochromic effect. The dyes were applied to polyester and nylon
fabrics and their fastness characteristics assessed. It was
found generally that the dyes are very resistant to alkaline
washing and are also suitable for transfer printing.
Series of me-thine dyes were also synthesized by condensing
highly electronegative active methylene compounds with formerly
group of aromatic compounds and the dyes obtained were applied on
polyester and nylon fabrics. The co lours obtained are very
brilliant, ranging from yellow to green with good resistance to
alkaline hydrolysis.
Description
Being a Thesis submitted to the Postgraduate 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.
September, 1991.
Keywords
EFFECT,, SUBSTITUENTS,, S P E C T R O S C O P I C A N D,, DYEING,, PROPERTIES,, M O N O A Z O,, METHINE,, DYES