5-Acceptor-substituted 4-amino-2-arylazothiazoles. A unique black monoazo chromophoric system

Abstract

Replacement of the chlorine substituent in blue dyes of the 5-acceptor-4-chloro-2-(4-N,N-dialkylaminophenylazo)thiazole type by a tertiary amino group produces a black monoazo chromophoric system with three π → π* bands spanning the whole of the visible spectrum.

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