Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state

Detalhes bibliográficos
Autor(a) principal: Netto Ferreira, José Carlos
Data de Publicação: 2011
Outros Autores: Silva, Eliete S. Lopes da, Lucas, Nanci Camara de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/14625
Resumo: Texto completo: acesso restrito. p. 135–141
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spelling Netto Ferreira, José CarlosSilva, Eliete S. Lopes daLucas, Nanci Camara deNetto Ferreira, José CarlosSilva, Eliete S. Lopes daLucas, Nanci Camara de2014-02-17T12:08:50Z20111010-6030http://repositorio.ufba.br/ri/handle/ri/14625v. 225 n. 1Texto completo: acesso restrito. p. 135–141The steady state photolysis of thioxanthen-9-one-10,10-dioxide (1) in dichloromethane does not result in any product formation. In hydrogen donor solvents, such as 2-propanol, toluene or cyclohexane, the formation of the corresponding pinacol was readily observed. The phosphorescence spectrum of 1 in EPA, at 77 K, reveals a triplet energy of 66.3 kcal mol−1. Laser flash photolysis irradiation of a degassed acetonitrile solution of 1 led to the formation of its triplet excited state (λmax = 375 and 520 nm, τ = 11 μs) that was quenched by oxygen, β-carotene and 1,3-cycloexadiene at a diffusion controlled rate constant. The quenching rate constants for the triplet of 1 with 1,4-cyclohexadiene, methanol, ethanol, 2-propanol, cyclohexane, substituted phenols and amines were determined, ranging from 7.1 × 106 (for methanol) to 3.1 × 1010 L mol−1 s−1 (for triethylamine). From the quenching rate constants observed for the triplet excited state and from the steady state photolysis, it was concluded that the remarkable reactivity of 1 is due to the n,π* character of the carbonyl chromophore.Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2014-02-17T12:08:50Z No. of bitstreams: 1 José Carlos Netto-Ferreira.pdf: 641980 bytes, checksum: e91e322be4f05dc425b58f0f5dc10fb6 (MD5)Made available in DSpace on 2014-02-17T12:08:50Z (GMT). No. of bitstreams: 1 José Carlos Netto-Ferreira.pdf: 641980 bytes, checksum: e91e322be4f05dc425b58f0f5dc10fb6 (MD5) Previous issue date: 2011http://dx.doi.org/10.1016/j.jphotochem.2011.10.010reponame:Repositório Institucional da UFBAinstname:Universidade Federal da Bahia (UFBA)instacron:UFBALaser flash photolysisThioxanthen-9-one-10,10-dioxideTriplet excited statePhotochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited stateJournal of Photochemistry and Photobiology A: Chemistryinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article10000-01-01info:eu-repo/semantics/openAccessengORIGINALJosé Carlos Netto-Ferreira.pdfJosé Carlos Netto-Ferreira.pdfapplication/pdf641980https://repositorio.ufba.br/bitstream/ri/14625/1/Jos%c3%a9%20Carlos%20Netto-Ferreira.pdfe91e322be4f05dc425b58f0f5dc10fb6MD51LICENSElicense.txtlicense.txttext/plain1345https://repositorio.ufba.br/bitstream/ri/14625/2/license.txtff6eaa8b858ea317fded99f125f5fcd0MD52TEXTJosé Carlos Netto-Ferreira.pdf.txtJosé Carlos Netto-Ferreira.pdf.txtExtracted texttext/plain38295https://repositorio.ufba.br/bitstream/ri/14625/3/Jos%c3%a9%20Carlos%20Netto-Ferreira.pdf.txtbf1a7297c4c0a0794ae64d877388ceffMD53ri/146252022-07-05 14:02:58.576oai:repositorio.ufba.br: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Repositório InstitucionalPUBhttp://192.188.11.11:8080/oai/requestopendoar:19322022-07-05T17:02:58Repositório Institucional da UFBA - Universidade Federal da Bahia (UFBA)false
dc.title.pt_BR.fl_str_mv Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state
dc.title.alternative.pt_BR.fl_str_mv Journal of Photochemistry and Photobiology A: Chemistry
title Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state
spellingShingle Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state
Netto Ferreira, José Carlos
Laser flash photolysis
Thioxanthen-9-one-10,10-dioxide
Triplet excited state
title_short Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state
title_full Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state
title_fullStr Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state
title_full_unstemmed Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state
title_sort Photochemistry of thioxanthen-9-one-10,10-dioxide: A remarkably reactive triplet excited state
author Netto Ferreira, José Carlos
author_facet Netto Ferreira, José Carlos
Silva, Eliete S. Lopes da
Lucas, Nanci Camara de
author_role author
author2 Silva, Eliete S. Lopes da
Lucas, Nanci Camara de
author2_role author
author
dc.contributor.author.fl_str_mv Netto Ferreira, José Carlos
Silva, Eliete S. Lopes da
Lucas, Nanci Camara de
Netto Ferreira, José Carlos
Silva, Eliete S. Lopes da
Lucas, Nanci Camara de
dc.subject.por.fl_str_mv Laser flash photolysis
Thioxanthen-9-one-10,10-dioxide
Triplet excited state
topic Laser flash photolysis
Thioxanthen-9-one-10,10-dioxide
Triplet excited state
description Texto completo: acesso restrito. p. 135–141
publishDate 2011
dc.date.issued.fl_str_mv 2011
dc.date.accessioned.fl_str_mv 2014-02-17T12:08:50Z
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://repositorio.ufba.br/ri/handle/ri/14625
dc.identifier.issn.none.fl_str_mv 1010-6030
dc.identifier.number.pt_BR.fl_str_mv v. 225 n. 1
identifier_str_mv 1010-6030
v. 225 n. 1
url http://repositorio.ufba.br/ri/handle/ri/14625
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.jphotochem.2011.10.010
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instname:Universidade Federal da Bahia (UFBA)
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reponame_str Repositório Institucional da UFBA
collection Repositório Institucional da UFBA
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