Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution
Autor(a) principal: | |
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Data de Publicação: | 2003 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/10446 https://doi.org/10.1021/ja037254f |
Resumo: | The lowest triplet state of tris(8-hydroxyquinoline)aluminium(III) (Alq3) has been prepared by pulse radiolysis/energy transfer from appropriate donors in benzene solutions and has an absorption maximum around 510 nm with a lifetime of about 50 μs. It is quenched by molecular oxygen, leading to singlet oxygen formation. From flash photolysis and singlet oxygen formation measurements, a quantum yield of triplet formation of 0.24 was determined for direct photolysis of the complex. A value of 2.10 ± 0.10 eV was determined for the energy of the lowest triplet state by energy transfer studies and was confirmed by phosphorescence measurements on Alq3, either in the heavy atom solvent ethyl iodide or photosensitized by benzophenone in benzene. Dexter (exchange) energy transfer was observed from triplet Alq3 to platinum(II) octaethylporphyrin. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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7160 |
spelling |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene SolutionThe lowest triplet state of tris(8-hydroxyquinoline)aluminium(III) (Alq3) has been prepared by pulse radiolysis/energy transfer from appropriate donors in benzene solutions and has an absorption maximum around 510 nm with a lifetime of about 50 μs. It is quenched by molecular oxygen, leading to singlet oxygen formation. From flash photolysis and singlet oxygen formation measurements, a quantum yield of triplet formation of 0.24 was determined for direct photolysis of the complex. A value of 2.10 ± 0.10 eV was determined for the energy of the lowest triplet state by energy transfer studies and was confirmed by phosphorescence measurements on Alq3, either in the heavy atom solvent ethyl iodide or photosensitized by benzophenone in benzene. Dexter (exchange) energy transfer was observed from triplet Alq3 to platinum(II) octaethylporphyrin.American Chemical Society2003-12-17info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/10446http://hdl.handle.net/10316/10446https://doi.org/10.1021/ja037254fengJournal of the American Chemical Society. 125:50 (2003) 15310-153110002-7863Burrows, Hugh D.Fernandes, MarianaMelo, J. Seixas deMonkman, Andrew P.Navaratnam, Suppiahinfo: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:RCAAP2021-09-29T09:54:46Zoai:estudogeral.uc.pt:10316/10446Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:01:30.833012Repositório 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 |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution |
title |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution |
spellingShingle |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution Burrows, Hugh D. |
title_short |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution |
title_full |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution |
title_fullStr |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution |
title_full_unstemmed |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution |
title_sort |
Characterization of the Triplet State of Tris(8-hydroxyquinoline)aluminium(III) in Benzene Solution |
author |
Burrows, Hugh D. |
author_facet |
Burrows, Hugh D. Fernandes, Mariana Melo, J. Seixas de Monkman, Andrew P. Navaratnam, Suppiah |
author_role |
author |
author2 |
Fernandes, Mariana Melo, J. Seixas de Monkman, Andrew P. Navaratnam, Suppiah |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Burrows, Hugh D. Fernandes, Mariana Melo, J. Seixas de Monkman, Andrew P. Navaratnam, Suppiah |
description |
The lowest triplet state of tris(8-hydroxyquinoline)aluminium(III) (Alq3) has been prepared by pulse radiolysis/energy transfer from appropriate donors in benzene solutions and has an absorption maximum around 510 nm with a lifetime of about 50 μs. It is quenched by molecular oxygen, leading to singlet oxygen formation. From flash photolysis and singlet oxygen formation measurements, a quantum yield of triplet formation of 0.24 was determined for direct photolysis of the complex. A value of 2.10 ± 0.10 eV was determined for the energy of the lowest triplet state by energy transfer studies and was confirmed by phosphorescence measurements on Alq3, either in the heavy atom solvent ethyl iodide or photosensitized by benzophenone in benzene. Dexter (exchange) energy transfer was observed from triplet Alq3 to platinum(II) octaethylporphyrin. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-12-17 |
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 |
http://hdl.handle.net/10316/10446 http://hdl.handle.net/10316/10446 https://doi.org/10.1021/ja037254f |
url |
http://hdl.handle.net/10316/10446 https://doi.org/10.1021/ja037254f |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of the American Chemical Society. 125:50 (2003) 15310-15311 0002-7863 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
American Chemical Society |
publisher.none.fl_str_mv |
American Chemical Society |
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 |
institution |
RCAAP |
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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1799133906391269376 |