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
- Institución
- Universidad Nacional de Buenos Aires. Facultad de Ciencias Exactas y Naturales
- OAI Identificador
- paperaa:paper_14203049_v17_n2_p1602_Duarte
Ver los metadatos del registro completo
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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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13.070432 |