New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization
Autor(a) principal: | |
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Data de Publicação: | 2002 |
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/10316/10282 https://doi.org/10.1021/jp013678p |
Resumo: | Halogenated phenylbacteriochlorins are synthesized with high yields in a two-step procedure. They have strong absorbances in the red and are very stable to air and light at room temperature. Flash photolysis measurements show that the triplet states of these bacteriochlorins have 30 μs lifetimes in deaerated toluene, that are quenched with diffusion-controlled rate constants by molecular oxygen. Time-resolved photoacoustic measurements, with nanosecond and nanocalorie resolution, show that these bacteriochlorins sensitize the formation of singlet oxygen with nearly unity quantum yield. However, singlet-oxygen phosphorescence measurements indicate that physical quenching occurs before the singlet-oxygen molecules diffuse into solution, and nearly half of the sensitized singlet states are lost. |
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New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen SensitizationHalogenated phenylbacteriochlorins are synthesized with high yields in a two-step procedure. They have strong absorbances in the red and are very stable to air and light at room temperature. Flash photolysis measurements show that the triplet states of these bacteriochlorins have 30 μs lifetimes in deaerated toluene, that are quenched with diffusion-controlled rate constants by molecular oxygen. Time-resolved photoacoustic measurements, with nanosecond and nanocalorie resolution, show that these bacteriochlorins sensitize the formation of singlet oxygen with nearly unity quantum yield. However, singlet-oxygen phosphorescence measurements indicate that physical quenching occurs before the singlet-oxygen molecules diffuse into solution, and nearly half of the sensitized singlet states are lost.American Chemical Society2002-04-18info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/10282http://hdl.handle.net/10316/10282https://doi.org/10.1021/jp013678pengThe Journal of Physical Chemistry A. 106:15 (2002) 3787-37951089-5639Pineiro, MartaGonçalves, A. M. d'A. RochaPereira, Mariette M.Formosinho, Sebastião J.Arnaut, Luís G.info: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:RCAAP2020-05-25T13:12:52Zoai:estudogeral.uc.pt:10316/10282Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:01:11.277767Repositório 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 |
New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization |
title |
New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization |
spellingShingle |
New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization Pineiro, Marta |
title_short |
New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization |
title_full |
New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization |
title_fullStr |
New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization |
title_full_unstemmed |
New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization |
title_sort |
New Halogenated Phenylbacteriochlorins and Their Efficiency in Singlet-Oxygen Sensitization |
author |
Pineiro, Marta |
author_facet |
Pineiro, Marta Gonçalves, A. M. d'A. Rocha Pereira, Mariette M. Formosinho, Sebastião J. Arnaut, Luís G. |
author_role |
author |
author2 |
Gonçalves, A. M. d'A. Rocha Pereira, Mariette M. Formosinho, Sebastião J. Arnaut, Luís G. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Pineiro, Marta Gonçalves, A. M. d'A. Rocha Pereira, Mariette M. Formosinho, Sebastião J. Arnaut, Luís G. |
description |
Halogenated phenylbacteriochlorins are synthesized with high yields in a two-step procedure. They have strong absorbances in the red and are very stable to air and light at room temperature. Flash photolysis measurements show that the triplet states of these bacteriochlorins have 30 μs lifetimes in deaerated toluene, that are quenched with diffusion-controlled rate constants by molecular oxygen. Time-resolved photoacoustic measurements, with nanosecond and nanocalorie resolution, show that these bacteriochlorins sensitize the formation of singlet oxygen with nearly unity quantum yield. However, singlet-oxygen phosphorescence measurements indicate that physical quenching occurs before the singlet-oxygen molecules diffuse into solution, and nearly half of the sensitized singlet states are lost. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-04-18 |
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/10316/10282 http://hdl.handle.net/10316/10282 https://doi.org/10.1021/jp013678p |
url |
http://hdl.handle.net/10316/10282 https://doi.org/10.1021/jp013678p |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
The Journal of Physical Chemistry A. 106:15 (2002) 3787-3795 1089-5639 |
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 |
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1799133904316137472 |