Journal
TETRAHEDRON LETTERS
Volume 47, Issue 22, Pages 3711-3714Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2006.03.125
Keywords
photochromism; heterocyclic azo dyes; thienylpyrroles; aggregation
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Funding
- Fundação para a Ciência e a Tecnologia [PD/BD/52602/2014, POCTI/QUI/37816/2001] Funding Source: FCT
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The photochromic behaviour of thienylpyrrole azo dyes in THF Solutions was Studied for the first time. The photochromic properties are strongly dependent on the substitution pattern on the dyes. Nitro-substituted thienylpyrrole azo dyes are particularly interesting since they exhibit very fast colouration/decolouration processes. The activation energies of these compounds are among the lowest values reported for heterocyclic azo dyes. These compounds show aggregation phenomena in freshly prepared solutions of THF. which lead to variable photochromic behaviours. Only after 1-5 h the solutions reach equilibrium and then reproducible photochromic behaviour can be observed. (c) 2006 Elsevier Ltd. All rights reserved.
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