Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution
Autor(a) principal: | |
---|---|
Data de Publicação: | 2003 |
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=S0103-50532003000500007 |
Resumo: | Solutions of atactic poly(methacrylic acid), PMAA, with molecular weights in the range of (1.6 to 3.4) x 10(5) g mol-1, and labeled with the fluorescent dyes 9-aminoacridine or Nile blue were studied by photophysical measurements as a function of solvent viscosity and polarity. The conformational behavior of the PMAA chain segments around the fluorescent probe was reported by the change in the rotational diffusion of the dyes. Ethylene glycol swells the polymer chain compared with the more contracted conformation of PMAA in 50% water/ethylene glycol. The change in the rotational relaxation time of the dye bound to PMAA with the decrease of water content in the solvent mixture indicates a progressive expansion of polymer chain to a more open coil form in solution. |
id |
SBQ-2_1c30ddea33f33769b91c134d4e21f7e1 |
---|---|
oai_identifier_str |
oai:scielo:S0103-50532003000500007 |
network_acronym_str |
SBQ-2 |
network_name_str |
Journal of the Brazilian Chemical Society (Online) |
repository_id_str |
|
spelling |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solutiondyespolyelectrolytesPMAArotational diffusionsolvent frictionSolutions of atactic poly(methacrylic acid), PMAA, with molecular weights in the range of (1.6 to 3.4) x 10(5) g mol-1, and labeled with the fluorescent dyes 9-aminoacridine or Nile blue were studied by photophysical measurements as a function of solvent viscosity and polarity. The conformational behavior of the PMAA chain segments around the fluorescent probe was reported by the change in the rotational diffusion of the dyes. Ethylene glycol swells the polymer chain compared with the more contracted conformation of PMAA in 50% water/ethylene glycol. The change in the rotational relaxation time of the dye bound to PMAA with the decrease of water content in the solvent mixture indicates a progressive expansion of polymer chain to a more open coil form in solution.Sociedade Brasileira de Química2003-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532003000500007Journal of the Brazilian Chemical Society v.14 n.5 2003reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0103-50532003000500007info:eu-repo/semantics/openAccessOliveira,Hueder Paulo M. deGehlen,Marcelo Henriqueeng2004-02-04T00:00:00Zoai:scielo:S0103-50532003000500007Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2004-02-04T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution |
title |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution |
spellingShingle |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution Oliveira,Hueder Paulo M. de dyes polyelectrolytes PMAA rotational diffusion solvent friction |
title_short |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution |
title_full |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution |
title_fullStr |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution |
title_full_unstemmed |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution |
title_sort |
Time resolved fluorescence anisotropy of basic dyes bound to poly(methacrylic acid) in solution |
author |
Oliveira,Hueder Paulo M. de |
author_facet |
Oliveira,Hueder Paulo M. de Gehlen,Marcelo Henrique |
author_role |
author |
author2 |
Gehlen,Marcelo Henrique |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Oliveira,Hueder Paulo M. de Gehlen,Marcelo Henrique |
dc.subject.por.fl_str_mv |
dyes polyelectrolytes PMAA rotational diffusion solvent friction |
topic |
dyes polyelectrolytes PMAA rotational diffusion solvent friction |
description |
Solutions of atactic poly(methacrylic acid), PMAA, with molecular weights in the range of (1.6 to 3.4) x 10(5) g mol-1, and labeled with the fluorescent dyes 9-aminoacridine or Nile blue were studied by photophysical measurements as a function of solvent viscosity and polarity. The conformational behavior of the PMAA chain segments around the fluorescent probe was reported by the change in the rotational diffusion of the dyes. Ethylene glycol swells the polymer chain compared with the more contracted conformation of PMAA in 50% water/ethylene glycol. The change in the rotational relaxation time of the dye bound to PMAA with the decrease of water content in the solvent mixture indicates a progressive expansion of polymer chain to a more open coil form in solution. |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-10-01 |
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=S0103-50532003000500007 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532003000500007 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-50532003000500007 |
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.14 n.5 2003 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_ |
1750318165361950720 |