Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents

Detalhes bibliográficos
Autor(a) principal: Rodrigues,Janaina F.
Data de Publicação: 2010
Outros Autores: Silva,Francisco de Assis da, Netto-Ferreira,José Carlos
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Journal of the Brazilian Chemical Society (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010000600003
Resumo: The photoreactivity of the triplet excited state of thioxanthone (TX) was investigated employing the laser flash photolysis technique. The wavelength for the absorption maximum and the lifetime of the triplet excited state are solvent dependent. When hydrogen donor solvents were employed, a new band at 410 nm was observed in the triplet absorption spectrum, which was attributed to the ketyl radical derived from thioxantone. Quenching rate constants, k q, ranged from (1.7 ± 0.1) × 10(6) L mol-1 s-1 for toluene to ca. 10(9) L mol-1 s-1 for phenol and its derivatives containing polar substituents, as well as for indole, triethylamine and DABCO.
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spelling Laser flash photolysis study of the photochemistry of thioxanthone in organic solventslaser flash photolysistioxanthonetriplet excited statesolvent effectThe photoreactivity of the triplet excited state of thioxanthone (TX) was investigated employing the laser flash photolysis technique. The wavelength for the absorption maximum and the lifetime of the triplet excited state are solvent dependent. When hydrogen donor solvents were employed, a new band at 410 nm was observed in the triplet absorption spectrum, which was attributed to the ketyl radical derived from thioxantone. Quenching rate constants, k q, ranged from (1.7 ± 0.1) × 10(6) L mol-1 s-1 for toluene to ca. 10(9) L mol-1 s-1 for phenol and its derivatives containing polar substituents, as well as for indole, triethylamine and DABCO.Sociedade Brasileira de Química2010-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010000600003Journal of the Brazilian Chemical Society v.21 n.6 2010reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532010000600003info:eu-repo/semantics/openAccessRodrigues,Janaina F.Silva,Francisco de Assis daNetto-Ferreira,José Carloseng2010-07-19T00:00:00Zoai:scielo:S0103-50532010000600003Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2010-07-19T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents
title Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents
spellingShingle Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents
Rodrigues,Janaina F.
laser flash photolysis
tioxanthone
triplet excited state
solvent effect
title_short Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents
title_full Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents
title_fullStr Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents
title_full_unstemmed Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents
title_sort Laser flash photolysis study of the photochemistry of thioxanthone in organic solvents
author Rodrigues,Janaina F.
author_facet Rodrigues,Janaina F.
Silva,Francisco de Assis da
Netto-Ferreira,José Carlos
author_role author
author2 Silva,Francisco de Assis da
Netto-Ferreira,José Carlos
author2_role author
author
dc.contributor.author.fl_str_mv Rodrigues,Janaina F.
Silva,Francisco de Assis da
Netto-Ferreira,José Carlos
dc.subject.por.fl_str_mv laser flash photolysis
tioxanthone
triplet excited state
solvent effect
topic laser flash photolysis
tioxanthone
triplet excited state
solvent effect
description The photoreactivity of the triplet excited state of thioxanthone (TX) was investigated employing the laser flash photolysis technique. The wavelength for the absorption maximum and the lifetime of the triplet excited state are solvent dependent. When hydrogen donor solvents were employed, a new band at 410 nm was observed in the triplet absorption spectrum, which was attributed to the ketyl radical derived from thioxantone. Quenching rate constants, k q, ranged from (1.7 ± 0.1) × 10(6) L mol-1 s-1 for toluene to ca. 10(9) L mol-1 s-1 for phenol and its derivatives containing polar substituents, as well as for indole, triethylamine and DABCO.
publishDate 2010
dc.date.none.fl_str_mv 2010-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010000600003
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532010000600003
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0103-50532010000600003
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Journal of the Brazilian Chemical Society v.21 n.6 2010
reponame:Journal of the Brazilian Chemical Society (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Journal of the Brazilian Chemical Society (Online)
collection Journal of the Brazilian Chemical Society (Online)
repository.name.fl_str_mv Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv ||office@jbcs.sbq.org.br
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