A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno

Detalhes bibliográficos
Autor(a) principal: Santos,Frances R. dos
Data de Publicação: 2007
Outros Autores: Silva,Mônica T. da, Netto-Ferreira,José Carlos, Lucas,Nanci C. de
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000400025
Resumo: Rate constants for the quenching of 1,3-indandione (1) triplet by olefins and by hydrogen and electron donors were obtained employing the laser flash photolysis technique in benzene solution. These rate constants ranged from 2.5x10(5) Lmol-1s-1 (for 2-propanol) to 5.9x10(9) Lmol-1s-1 (for DABCO). From the quenching rate constants by 1,3-cyclohexadiene, trans- and cis-stilbene a value between 49.3 and 52.4 kcal/mol was estimated for the energy of the triplet state of 1,3-indandione. The npi* character of this triplet state was evidenced by the quenching rate constants obtained when typical hydrogen donors were employed as quenchers. For 2-phenyl-1,3-indandione (2, R=phenyl) a fast Norrish type I reaction is operating which prevents the determination of kinetic and spectroscopic data of its triplet state.
id SBQ-3_0d7dc8831955469cf6ab6c7184ae2889
oai_identifier_str oai:scielo:S0100-40422007000400025
network_acronym_str SBQ-3
network_name_str Química Nova (Online)
repository_id_str
spelling A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno1,3-indandioneslaser flash photolysistriplet excited stateRate constants for the quenching of 1,3-indandione (1) triplet by olefins and by hydrogen and electron donors were obtained employing the laser flash photolysis technique in benzene solution. These rate constants ranged from 2.5x10(5) Lmol-1s-1 (for 2-propanol) to 5.9x10(9) Lmol-1s-1 (for DABCO). From the quenching rate constants by 1,3-cyclohexadiene, trans- and cis-stilbene a value between 49.3 and 52.4 kcal/mol was estimated for the energy of the triplet state of 1,3-indandione. The npi* character of this triplet state was evidenced by the quenching rate constants obtained when typical hydrogen donors were employed as quenchers. For 2-phenyl-1,3-indandione (2, R=phenyl) a fast Norrish type I reaction is operating which prevents the determination of kinetic and spectroscopic data of its triplet state.Sociedade Brasileira de Química2007-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000400025Química Nova v.30 n.4 2007reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422007000400025info:eu-repo/semantics/openAccessSantos,Frances R. dosSilva,Mônica T. daNetto-Ferreira,José CarlosLucas,Nanci C. depor2007-08-10T00:00:00Zoai:scielo:S0100-40422007000400025Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2007-08-10T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno
title A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno
spellingShingle A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno
Santos,Frances R. dos
1,3-indandiones
laser flash photolysis
triplet excited state
title_short A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno
title_full A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno
title_fullStr A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno
title_full_unstemmed A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno
title_sort A reatividade do estado excitado triplete de 1,3-indanodiona em benzeno
author Santos,Frances R. dos
author_facet Santos,Frances R. dos
Silva,Mônica T. da
Netto-Ferreira,José Carlos
Lucas,Nanci C. de
author_role author
author2 Silva,Mônica T. da
Netto-Ferreira,José Carlos
Lucas,Nanci C. de
author2_role author
author
author
dc.contributor.author.fl_str_mv Santos,Frances R. dos
Silva,Mônica T. da
Netto-Ferreira,José Carlos
Lucas,Nanci C. de
dc.subject.por.fl_str_mv 1,3-indandiones
laser flash photolysis
triplet excited state
topic 1,3-indandiones
laser flash photolysis
triplet excited state
description Rate constants for the quenching of 1,3-indandione (1) triplet by olefins and by hydrogen and electron donors were obtained employing the laser flash photolysis technique in benzene solution. These rate constants ranged from 2.5x10(5) Lmol-1s-1 (for 2-propanol) to 5.9x10(9) Lmol-1s-1 (for DABCO). From the quenching rate constants by 1,3-cyclohexadiene, trans- and cis-stilbene a value between 49.3 and 52.4 kcal/mol was estimated for the energy of the triplet state of 1,3-indandione. The npi* character of this triplet state was evidenced by the quenching rate constants obtained when typical hydrogen donors were employed as quenchers. For 2-phenyl-1,3-indandione (2, R=phenyl) a fast Norrish type I reaction is operating which prevents the determination of kinetic and spectroscopic data of its triplet state.
publishDate 2007
dc.date.none.fl_str_mv 2007-08-01
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=S0100-40422007000400025
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000400025
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40422007000400025
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.30 n.4 2007
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
_version_ 1750318106460291072

Registros relacionados