Synthesis and Spectroscopic properties of New Azo dyes extended conjugation with malononitrile

Synthesis and Spectroscopic properties of New Azo dyes extended conjugation with malononitrile
Issue Date
대한화학회 추계 학술대회
VOL 108, P-143
Dyes used for fabric such as cotton, wool, and silk are complex organic molecules that contain what is known as a chromophore group, that is, they contain some type of conjugated, alternating double and single bonds in part of the molecule. These molecules can absorb certain wavelengths of visible light and reflect the remaining light and, thus, give a fabric its color. As a consequence of π-delocalization, aryl azo compounds containing a -N=N- structure in the molecule have vivid colors, especially reds, oranges, and yellows. Therefore, they are used as dyes, and are commonly known as azo dyes. Disperse dyes are the water insoluble dyes dyeing polyester fibers at high pressure and high temperature. Among Disperse dyes, Disperse Orange 30 is one of the most widely used dyes. But, this dye contains penta chloro phenol (PCP) and tetra chloro phenol (TeCP) in the molecule structure representative environmental hazardous substance. Therefore, The development of eco-friendly disperse dyes without PCP and TeCP for replacing Disperse Orange 30 has attracted much attention in the environmental concern. In this study, we prepared several azo-compounds substituted by carbonyl group, and its malononitrile derivatives were prepared by Knoevenagel condensation with malononitrile to investigate the effects of extended conjugation at the para position. And we studied UV-Visible characteristics for each of azo-compounds.
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