Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
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=S0103-50532014000800017 |
Resumo: | The photophysical behaviour of the dye pseudoisocyanine (PIC) was studied in macromolecular (sodium alginate) and hydrotropic (sodium toluenesulphonate and sodium styrenesulphonate) solutions. It was found that the placement of the dye in these media affected the spectroscopic properties and the lifetimes of its excited states. The effects are traced down to the interactions of the dye molecules with the macromolecules or their placement in the hydrotropic aggregates, inducing the formation of J-aggregates of the dye or constraining its internal movements reducing the rate of internal conversion. The lifetimes of the triplet state of the dye in alginate were of the order of 20-30 ns in freshly prepared solutions, whereas when leaving the solution to rest for some hours the decay became biexponential with the growing of a species with lifetime around 150 ns. The latter is assigned to dye molecules placed in the alginate network. |
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Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutionspseudoisocyaninehydrotropesalginateJ-aggregatesThe photophysical behaviour of the dye pseudoisocyanine (PIC) was studied in macromolecular (sodium alginate) and hydrotropic (sodium toluenesulphonate and sodium styrenesulphonate) solutions. It was found that the placement of the dye in these media affected the spectroscopic properties and the lifetimes of its excited states. The effects are traced down to the interactions of the dye molecules with the macromolecules or their placement in the hydrotropic aggregates, inducing the formation of J-aggregates of the dye or constraining its internal movements reducing the rate of internal conversion. The lifetimes of the triplet state of the dye in alginate were of the order of 20-30 ns in freshly prepared solutions, whereas when leaving the solution to rest for some hours the decay became biexponential with the growing of a species with lifetime around 150 ns. The latter is assigned to dye molecules placed in the alginate network.Sociedade Brasileira de Química2014-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532014000800017Journal of the Brazilian Chemical Society v.25 n.8 2014reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.5935/0103-5053.20140128info:eu-repo/semantics/openAccessMenegussi,Lukese R.Valandro,Silvano R.Poli,Alessandra L.Schmitt,Carla C.Neumann,Miguel G.eng2014-08-04T00:00:00Zoai:scielo:S0103-50532014000800017Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2014-08-04T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions |
title |
Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions |
spellingShingle |
Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions Menegussi,Lukese R. pseudoisocyanine hydrotropes alginate J-aggregates |
title_short |
Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions |
title_full |
Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions |
title_fullStr |
Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions |
title_full_unstemmed |
Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions |
title_sort |
Behaviour of pseudoisocyanine in macromolecular and hydrotropic solutions |
author |
Menegussi,Lukese R. |
author_facet |
Menegussi,Lukese R. Valandro,Silvano R. Poli,Alessandra L. Schmitt,Carla C. Neumann,Miguel G. |
author_role |
author |
author2 |
Valandro,Silvano R. Poli,Alessandra L. Schmitt,Carla C. Neumann,Miguel G. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Menegussi,Lukese R. Valandro,Silvano R. Poli,Alessandra L. Schmitt,Carla C. Neumann,Miguel G. |
dc.subject.por.fl_str_mv |
pseudoisocyanine hydrotropes alginate J-aggregates |
topic |
pseudoisocyanine hydrotropes alginate J-aggregates |
description |
The photophysical behaviour of the dye pseudoisocyanine (PIC) was studied in macromolecular (sodium alginate) and hydrotropic (sodium toluenesulphonate and sodium styrenesulphonate) solutions. It was found that the placement of the dye in these media affected the spectroscopic properties and the lifetimes of its excited states. The effects are traced down to the interactions of the dye molecules with the macromolecules or their placement in the hydrotropic aggregates, inducing the formation of J-aggregates of the dye or constraining its internal movements reducing the rate of internal conversion. The lifetimes of the triplet state of the dye in alginate were of the order of 20-30 ns in freshly prepared solutions, whereas when leaving the solution to rest for some hours the decay became biexponential with the growing of a species with lifetime around 150 ns. The latter is assigned to dye molecules placed in the alginate network. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-08-01 |
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=S0103-50532014000800017 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532014000800017 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.5935/0103-5053.20140128 |
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.25 n.8 2014 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 |
_version_ |
1750318176190595072 |