Delocalized cationic azo dyes containing a thiazole moiety |
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| Authors: | Maria A Salvador Paulo Almeida |
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| Institution: | a Departamento de Química, Centro de Química—Vila Real, Universidade de Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
b Departamento de Química and Unidade de I&D de Materiais Têxteis e Papeleiros, Universidade da Beira Interior, 6201-001 Covilhã, Portugal |
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| Abstract: | Several new delocalized cationic azo dyes incorporating a bathochromic thiazole moiety have been prepared in moderate to good yields. The synthesis involved the Knoevenagel condensation of an intermediate azo compound, bearing a terminal formyl group, with methylenic bases generated in situ from benzoazolium and quinolinium salts. All dyes display strong absorption around 700 nm and have shown negative solvatochromic behaviour. |
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| Keywords: | Cationic azo dyes Thiazole PDT Solvatochromism |
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