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Effect of the trifluoromethylsulphonyl group on the colour of dimethylaminoazo dyes

Authors
Journal
Dyes and Pigments
0143-7208
Publisher
Elsevier
Publication Date
Volume
3
Issue
1
Identifiers
DOI: 10.1016/0143-7208(82)80009-0

Abstract

Abstract The comparison of the electronic spectra of mono- and di-substituted dimethylaminoazo dyes with electron-withdrawing substituents CF 3SO 2 and NO 2 shows that in para-substituted dyes the chromophore chain length plays the main role whereas in ortho-substituted dyes steric effects are essential. In di-substituted dyes account must be taken of the positions of both substituents in the benzene ring. The halochromity indices of dyes are directly dependent on the electronic effects of substituents.

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