Photochromic properties of thienylpyrrole azo dyes in solution

Detalhes bibliográficos
Autor(a) principal: Coelho, Paulo J.
Data de Publicação: 2006
Outros Autores: Carvalho, Luís H. Melo de, Fonseca, A. Maurício C., Raposo, M. Manuela M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://hdl.handle.net/1822/7903
Resumo: 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.
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spelling Photochromic properties of thienylpyrrole azo dyes in solutionPhotochromismHeterocyclic azo dyesThienylpyrrolesAggregationScience & TechnologyThe 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.Fundação para a Ciência e Tecnologia (FCT)To FCT (Portugal’s Foundation for Science and Technology) and FEDER for financial support to the research units Centro de Química-Vila Real (POCTI-SFA-3-616) and Centro de Química-Universidade do Minho (POCTI/QUI/37816/2001). We also thank Dr. Kevin Yager (McGill University) for the helpful suggestions and the group of University of Minho is also grateful to Professor G. Kirsch (University of Metz).ElsevierUniversidade do MinhoCoelho, Paulo J.Carvalho, Luís H. Melo deFonseca, A. Maurício C.Raposo, M. Manuela M.20062006-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/7903engCoelho, P. J., Carvalho, L. M., Fonseca, A. M. C., & Raposo, M. M. M. (2006). Photochromic properties of thienylpyrrole azo dyes in solution. Tetrahedron Letters, 47(22), 3711-3714. doi: https://doi.org/10.1016/j.tetlet.2006.03.1250040-403910.1016/j.tetlet.2006.03.125https://www.sciencedirect.com/science/article/pii/S0040403906006071info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:47:16Zoai:repositorium.sdum.uminho.pt:1822/7903Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:45:21.798415Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Photochromic properties of thienylpyrrole azo dyes in solution
title Photochromic properties of thienylpyrrole azo dyes in solution
spellingShingle Photochromic properties of thienylpyrrole azo dyes in solution
Coelho, Paulo J.
Photochromism
Heterocyclic azo dyes
Thienylpyrroles
Aggregation
Science & Technology
title_short Photochromic properties of thienylpyrrole azo dyes in solution
title_full Photochromic properties of thienylpyrrole azo dyes in solution
title_fullStr Photochromic properties of thienylpyrrole azo dyes in solution
title_full_unstemmed Photochromic properties of thienylpyrrole azo dyes in solution
title_sort Photochromic properties of thienylpyrrole azo dyes in solution
author Coelho, Paulo J.
author_facet Coelho, Paulo J.
Carvalho, Luís H. Melo de
Fonseca, A. Maurício C.
Raposo, M. Manuela M.
author_role author
author2 Carvalho, Luís H. Melo de
Fonseca, A. Maurício C.
Raposo, M. Manuela M.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Coelho, Paulo J.
Carvalho, Luís H. Melo de
Fonseca, A. Maurício C.
Raposo, M. Manuela M.
dc.subject.por.fl_str_mv Photochromism
Heterocyclic azo dyes
Thienylpyrroles
Aggregation
Science & Technology
topic Photochromism
Heterocyclic azo dyes
Thienylpyrroles
Aggregation
Science & Technology
description 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.
publishDate 2006
dc.date.none.fl_str_mv 2006
2006-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://hdl.handle.net/1822/7903
url https://hdl.handle.net/1822/7903
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Coelho, P. J., Carvalho, L. M., Fonseca, A. M. C., & Raposo, M. M. M. (2006). Photochromic properties of thienylpyrrole azo dyes in solution. Tetrahedron Letters, 47(22), 3711-3714. doi: https://doi.org/10.1016/j.tetlet.2006.03.125
0040-4039
10.1016/j.tetlet.2006.03.125
https://www.sciencedirect.com/science/article/pii/S0040403906006071
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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