Novel photochromic 2,2′-bithiophene azo dyes

The photochromic properties and colour constancy of two series of 2,2′-bithiophene azo dyes in THF solution were strongly dependent on the substitution pattern of the dyes. Under visible irradiation (>420 nm) while some dyes exhibited a significant change in colour intensity others exhibited an a...

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Bibliographic Details
Published in:Dyes and pigments 2009-08, Vol.82 (2), p.130-133
Main Authors: Coelho, Paulo J., Carvalho, Luis M., Moura, João C.V.P., Raposo, M. Manuela M.
Format: Article
Language:English
Subjects:
Azo dyes
Bithiophene
Heterocyclic azo dyes
Photochromism
UV/vis spectroscopy
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Summary:The photochromic properties and colour constancy of two series of 2,2′-bithiophene azo dyes in THF solution were strongly dependent on the substitution pattern of the dyes. Under visible irradiation (>420 nm) while some dyes exhibited a significant change in colour intensity others exhibited an almost stable absorption. The photokinetic parameters of the systems are also described.
ISSN:0143-7208
1873-3743
DOI:10.1016/j.dyepig.2008.12.005