Phloxine B as a probe for entrapment in microcrystalline cellulose

Autores
Duarte, P.; Ferreira, D.P.; MacHado, I.F.; Ferreira, L.F.V.; Rodríguez, H.B.; Román, E.S.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The photophysical behaviour of phloxine B adsorbed onto microcrystalline cellulose was evaluated by reflectance spectroscopy and laser induced time-resolved luminescence in the picosecond-nanosecond and microsecond- millisecond ranges. Analysis of the absorption spectral changes with concentration points to a small tendency of the dye to aggregate in the range of concentrations under study. Prompt fluorescence, phosphorescence and delayed fluorescence spectral decays were measured at room temperature and 77 K, without the need of sample degassing because cellulose protects triplet states from oxygen quenching. In all cases, spectral changes with time and lifetime distribution analysis were consistent with the dye coexisting in two different environments: dyes tightly entrapped between polymer chains in crystalline regions of cellulose showed longer fluorescence and phosphorescence lifetimes and more energetic triplet states, while dyes adsorbed in more amorphous regions of the support showed shorter lifetimes and less energetic triplet states. This behaviour is discussed in terms of the different dye-support interactions in both kinds of adsorption sites.
Fil:Rodríguez, H.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
Fuente
Molecules 2012;17(2):1602-1616
Materia
Delayed fluorescence
Heterogeneous systems prompt fluorescence
Microenvironmental effects
Phloxine B
Phosphorescence
cellulose
eosine blue
article
chemistry
luminescence
molecular probe
spectrofluorometry
Cellulose
Eosine I Bluish
Luminescence
Molecular Probes
Spectrometry, Fluorescence
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/2.5/ar
Repositorio
Biblioteca Digital (UBA-FCEN)
Institución
Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
OAI Identificador
paperaa:paper_14203049_v17_n2_p1602_Duarte

id BDUBAFCEN_4f1059509fd0678584c56f042a635234
oai_identifier_str paperaa:paper_14203049_v17_n2_p1602_Duarte
network_acronym_str BDUBAFCEN
repository_id_str 1896
network_name_str Biblioteca Digital (UBA-FCEN)
spelling Phloxine B as a probe for entrapment in microcrystalline celluloseDuarte, P.Ferreira, D.P.MacHado, I.F.Ferreira, L.F.V.Rodríguez, H.B.Román, E.S.Delayed fluorescenceHeterogeneous systems prompt fluorescenceMicroenvironmental effectsPhloxine BPhosphorescencecelluloseeosine bluearticlechemistryluminescencemolecular probespectrofluorometryCelluloseEosine I BluishLuminescenceMolecular ProbesSpectrometry, FluorescenceThe photophysical behaviour of phloxine B adsorbed onto microcrystalline cellulose was evaluated by reflectance spectroscopy and laser induced time-resolved luminescence in the picosecond-nanosecond and microsecond- millisecond ranges. Analysis of the absorption spectral changes with concentration points to a small tendency of the dye to aggregate in the range of concentrations under study. Prompt fluorescence, phosphorescence and delayed fluorescence spectral decays were measured at room temperature and 77 K, without the need of sample degassing because cellulose protects triplet states from oxygen quenching. In all cases, spectral changes with time and lifetime distribution analysis were consistent with the dye coexisting in two different environments: dyes tightly entrapped between polymer chains in crystalline regions of cellulose showed longer fluorescence and phosphorescence lifetimes and more energetic triplet states, while dyes adsorbed in more amorphous regions of the support showed shorter lifetimes and less energetic triplet states. This behaviour is discussed in terms of the different dye-support interactions in both kinds of adsorption sites.Fil:Rodríguez, H.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.2012info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12110/paper_14203049_v17_n2_p1602_DuarteMolecules 2012;17(2):1602-1616reponame:Biblioteca Digital (UBA-FCEN)instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesinstacron:UBA-FCENenginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/2.5/ar2025-09-29T13:43:09Zpaperaa:paper_14203049_v17_n2_p1602_DuarteInstitucionalhttps://digital.bl.fcen.uba.ar/Universidad públicaNo correspondehttps://digital.bl.fcen.uba.ar/cgi-bin/oaiserver.cgiana@bl.fcen.uba.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:18962025-09-29 13:43:10.905Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturalesfalse
dc.title.none.fl_str_mv Phloxine B as a probe for entrapment in microcrystalline cellulose
title Phloxine B as a probe for entrapment in microcrystalline cellulose
spellingShingle Phloxine B as a probe for entrapment in microcrystalline cellulose
Duarte, P.
Delayed fluorescence
Heterogeneous systems prompt fluorescence
Microenvironmental effects
Phloxine B
Phosphorescence
cellulose
eosine blue
article
chemistry
luminescence
molecular probe
spectrofluorometry
Cellulose
Eosine I Bluish
Luminescence
Molecular Probes
Spectrometry, Fluorescence
title_short Phloxine B as a probe for entrapment in microcrystalline cellulose
title_full Phloxine B as a probe for entrapment in microcrystalline cellulose
title_fullStr Phloxine B as a probe for entrapment in microcrystalline cellulose
title_full_unstemmed Phloxine B as a probe for entrapment in microcrystalline cellulose
title_sort Phloxine B as a probe for entrapment in microcrystalline cellulose
dc.creator.none.fl_str_mv Duarte, P.
Ferreira, D.P.
MacHado, I.F.
Ferreira, L.F.V.
Rodríguez, H.B.
Román, E.S.
author Duarte, P.
author_facet Duarte, P.
Ferreira, D.P.
MacHado, I.F.
Ferreira, L.F.V.
Rodríguez, H.B.
Román, E.S.
author_role author
author2 Ferreira, D.P.
MacHado, I.F.
Ferreira, L.F.V.
Rodríguez, H.B.
Román, E.S.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Delayed fluorescence
Heterogeneous systems prompt fluorescence
Microenvironmental effects
Phloxine B
Phosphorescence
cellulose
eosine blue
article
chemistry
luminescence
molecular probe
spectrofluorometry
Cellulose
Eosine I Bluish
Luminescence
Molecular Probes
Spectrometry, Fluorescence
topic Delayed fluorescence
Heterogeneous systems prompt fluorescence
Microenvironmental effects
Phloxine B
Phosphorescence
cellulose
eosine blue
article
chemistry
luminescence
molecular probe
spectrofluorometry
Cellulose
Eosine I Bluish
Luminescence
Molecular Probes
Spectrometry, Fluorescence
dc.description.none.fl_txt_mv The photophysical behaviour of phloxine B adsorbed onto microcrystalline cellulose was evaluated by reflectance spectroscopy and laser induced time-resolved luminescence in the picosecond-nanosecond and microsecond- millisecond ranges. Analysis of the absorption spectral changes with concentration points to a small tendency of the dye to aggregate in the range of concentrations under study. Prompt fluorescence, phosphorescence and delayed fluorescence spectral decays were measured at room temperature and 77 K, without the need of sample degassing because cellulose protects triplet states from oxygen quenching. In all cases, spectral changes with time and lifetime distribution analysis were consistent with the dye coexisting in two different environments: dyes tightly entrapped between polymer chains in crystalline regions of cellulose showed longer fluorescence and phosphorescence lifetimes and more energetic triplet states, while dyes adsorbed in more amorphous regions of the support showed shorter lifetimes and less energetic triplet states. This behaviour is discussed in terms of the different dye-support interactions in both kinds of adsorption sites.
Fil:Rodríguez, H.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
description The photophysical behaviour of phloxine B adsorbed onto microcrystalline cellulose was evaluated by reflectance spectroscopy and laser induced time-resolved luminescence in the picosecond-nanosecond and microsecond- millisecond ranges. Analysis of the absorption spectral changes with concentration points to a small tendency of the dye to aggregate in the range of concentrations under study. Prompt fluorescence, phosphorescence and delayed fluorescence spectral decays were measured at room temperature and 77 K, without the need of sample degassing because cellulose protects triplet states from oxygen quenching. In all cases, spectral changes with time and lifetime distribution analysis were consistent with the dye coexisting in two different environments: dyes tightly entrapped between polymer chains in crystalline regions of cellulose showed longer fluorescence and phosphorescence lifetimes and more energetic triplet states, while dyes adsorbed in more amorphous regions of the support showed shorter lifetimes and less energetic triplet states. This behaviour is discussed in terms of the different dye-support interactions in both kinds of adsorption sites.
publishDate 2012
dc.date.none.fl_str_mv 2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12110/paper_14203049_v17_n2_p1602_Duarte
url http://hdl.handle.net/20.500.12110/paper_14203049_v17_n2_p1602_Duarte
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/2.5/ar
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/2.5/ar
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv Molecules 2012;17(2):1602-1616
reponame:Biblioteca Digital (UBA-FCEN)
instname:Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron:UBA-FCEN
reponame_str Biblioteca Digital (UBA-FCEN)
collection Biblioteca Digital (UBA-FCEN)
instname_str Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
instacron_str UBA-FCEN
institution UBA-FCEN
repository.name.fl_str_mv Biblioteca Digital (UBA-FCEN) - Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
repository.mail.fl_str_mv ana@bl.fcen.uba.ar
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