Near-infrared absorbing delocalized cationic azo dyes

abstract

Novel, delocalized, cationic azo dyes derived from benzothiazole, benzoselenazole, indole and quinoline, displaying strong absorption around 700-800 nm, have been prepared in moderate to good yields. The synthesis involved the Knoevenagel condensation of an intermediate azo compound, possessing a 4-chloro-5-formylthiazole moiety, with methylenic bases generated in situ from benzoazolium and quinolinium salts. (C) 2009 Elsevier Ltd. All rights reserved.

keywords

DERIVATIVES

subject category

Chemistry; Engineering; Materials Science

authors

Salvador, MA; Almeida, P; Reis, LV; Santos, PF

our authors

acknowledgements

Fundacao para a Ciencia e a Tecnologia (Portugal), POCI 2010 and FEDER are greatly acknowledged for the funding of the Project

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