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Abstract:

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.

Registro:

Documento: Artículo
Título:Phloxine B as a probe for entrapment in microcrystalline cellulose
Autor:Duarte, P.; Ferreira, D.P.; MacHado, I.F.; Ferreira, L.F.V.; Rodríguez, H.B.; Román, E.S.
Filiación:Centro de Química-Física Molecular, IN-Institute of Nanoscience and Nanotechnology Complexo Interdisciplinar, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
Escola Superior de Tecnologia e Gestão, Instituto Politécnico de Portalegre, Lugar da Abadessa, 7301-901, Portalegre, Portugal
INQUIMAE / DQIAyQF, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pab. II, C1428EHA, Buenos Aires, Argentina
Palabras clave: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
Año:2012
Volumen:17
Número:2
Página de inicio:1602
Página de fin:1616
DOI: http://dx.doi.org/10.3390/molecules17021602
Título revista:Molecules
Título revista abreviado:Molecules
ISSN:14203049
CODEN:MOLEF
CAS:cellulose, 61991-22-8, 68073-05-2, 9004-34-6; eosine blue, 548-24-3; Cellulose, 9004-34-6; Eosine I Bluish, 18472-87-2; Molecular Probes
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_14203049_v17_n2_p1602_Duarte.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14203049_v17_n2_p1602_Duarte

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Citas:

---------- APA ----------
Duarte, P., Ferreira, D.P., MacHado, I.F., Ferreira, L.F.V., Rodríguez, H.B. & Román, E.S. (2012) . Phloxine B as a probe for entrapment in microcrystalline cellulose. Molecules, 17(2), 1602-1616.
http://dx.doi.org/10.3390/molecules17021602
---------- CHICAGO ----------
Duarte, P., Ferreira, D.P., MacHado, I.F., Ferreira, L.F.V., Rodríguez, H.B., Román, E.S. "Phloxine B as a probe for entrapment in microcrystalline cellulose" . Molecules 17, no. 2 (2012) : 1602-1616.
http://dx.doi.org/10.3390/molecules17021602
---------- MLA ----------
Duarte, P., Ferreira, D.P., MacHado, I.F., Ferreira, L.F.V., Rodríguez, H.B., Román, E.S. "Phloxine B as a probe for entrapment in microcrystalline cellulose" . Molecules, vol. 17, no. 2, 2012, pp. 1602-1616.
http://dx.doi.org/10.3390/molecules17021602
---------- VANCOUVER ----------
Duarte, P., Ferreira, D.P., MacHado, I.F., Ferreira, L.F.V., Rodríguez, H.B., Román, E.S. Phloxine B as a probe for entrapment in microcrystalline cellulose. Molecules. 2012;17(2):1602-1616.
http://dx.doi.org/10.3390/molecules17021602