Singlet oxygen reactivity in water-rich solvent mixtures

Detalhes bibliográficos
Autor(a) principal: Sousa,Cristina
Data de Publicação: 2008
Outros Autores: Rego,Ana Maria Botelho do, Sá e Melo,Teresa
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000600022
Resumo: The 3-methylindole (3MI) oxygenation sensitized by psoralen (PSO) has been investigated in 100%, 20% and 5% O2-saturated water/dioxane (H2O/Dx) mixtures. The lowering of the ¹O2* chemical rate when water (k chem∆3MI = 1.4 × 109 M-1 s-1) is replaced by deuterated water (k chem∆3MI = 1.9 × 108 M-1 s-1) suggests that hydrogen abstraction is involved in the rate determining step. A high dependence of the chemical rate constant on water concentration in H2O/Dx mixtures was found showing that water molecules are absolutely essential for the success of the 3MI substrate oxidation by ¹O2* in water-rich solvent mixtures.
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spelling Singlet oxygen reactivity in water-rich solvent mixturessinglet oxygenpsoralensolvent effectsThe 3-methylindole (3MI) oxygenation sensitized by psoralen (PSO) has been investigated in 100%, 20% and 5% O2-saturated water/dioxane (H2O/Dx) mixtures. The lowering of the ¹O2* chemical rate when water (k chem∆3MI = 1.4 × 109 M-1 s-1) is replaced by deuterated water (k chem∆3MI = 1.9 × 108 M-1 s-1) suggests that hydrogen abstraction is involved in the rate determining step. A high dependence of the chemical rate constant on water concentration in H2O/Dx mixtures was found showing that water molecules are absolutely essential for the success of the 3MI substrate oxidation by ¹O2* in water-rich solvent mixtures.Sociedade Brasileira de Química2008-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000600022Química Nova v.31 n.6 2008reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422008000600022info:eu-repo/semantics/openAccessSousa,CristinaRego,Ana Maria Botelho doSá e Melo,Teresaeng2008-10-10T00:00:00Zoai:scielo:S0100-40422008000600022Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2008-10-10T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Singlet oxygen reactivity in water-rich solvent mixtures
title Singlet oxygen reactivity in water-rich solvent mixtures
spellingShingle Singlet oxygen reactivity in water-rich solvent mixtures
Sousa,Cristina
singlet oxygen
psoralen
solvent effects
title_short Singlet oxygen reactivity in water-rich solvent mixtures
title_full Singlet oxygen reactivity in water-rich solvent mixtures
title_fullStr Singlet oxygen reactivity in water-rich solvent mixtures
title_full_unstemmed Singlet oxygen reactivity in water-rich solvent mixtures
title_sort Singlet oxygen reactivity in water-rich solvent mixtures
author Sousa,Cristina
author_facet Sousa,Cristina
Rego,Ana Maria Botelho do
Sá e Melo,Teresa
author_role author
author2 Rego,Ana Maria Botelho do
Sá e Melo,Teresa
author2_role author
author
dc.contributor.author.fl_str_mv Sousa,Cristina
Rego,Ana Maria Botelho do
Sá e Melo,Teresa
dc.subject.por.fl_str_mv singlet oxygen
psoralen
solvent effects
topic singlet oxygen
psoralen
solvent effects
description The 3-methylindole (3MI) oxygenation sensitized by psoralen (PSO) has been investigated in 100%, 20% and 5% O2-saturated water/dioxane (H2O/Dx) mixtures. The lowering of the ¹O2* chemical rate when water (k chem∆3MI = 1.4 × 109 M-1 s-1) is replaced by deuterated water (k chem∆3MI = 1.9 × 108 M-1 s-1) suggests that hydrogen abstraction is involved in the rate determining step. A high dependence of the chemical rate constant on water concentration in H2O/Dx mixtures was found showing that water molecules are absolutely essential for the success of the 3MI substrate oxidation by ¹O2* in water-rich solvent mixtures.
publishDate 2008
dc.date.none.fl_str_mv 2008-01-01
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=S0100-40422008000600022
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000600022
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0100-40422008000600022
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 Química Nova v.31 n.6 2008
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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