Delocalized cationic azo dyes derived from 2-aminoselenazole-5-carbaldehyde

abstract

Several delocalized cationic azo dyes incorporating a selenazole ring have been prepared by Knoevenagel condensation of an intermediate azo compound bearing a 5-formylselenazole group with methylene bases derived from indolenine, benzothiazole, benzoselenazole, and quinoline. All dyes display a strong absorption at around 700 nm, bathochromically shifted relative to their thiazole analogues, and show a negative solvatochromic behavior.

keywords

DERIVATIVES; PRECURSORS; SULFUR

subject category

Chemistry

authors

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

our authors

acknowledgements

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

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