Abstract:
Absorption and fluorescence properties of methylene blue (MB), a well-known singlet molecular oxygen photosensitizer, and its mixtures with pheophorbide-a (Pheo) sorbed on microgranular cellulose are studied, with emphasis on radiative and nonradiative energy transfer from Pheo to MB. Although pure MB builds up dimeric species on cellulose even at 2 × 10 -8 mol g -1, addition of 2.05 × 10 -7 mol g -1 Pheo largely inhibits aggregation up to nearly 10 -6 mol g -1 MB. At the same time, the absorption spectrum of monomeric MB in the presence of Pheo differs from the spectrum in pure cellulose. Both effects reveal a strong influence of Pheo on the medium properties. A model relying entirely on experimental data is developed, through which energy transfer efficiencies can be calculated for thin and thick layers of dye-loaded cellulose. At the largest concentration of MB assuring no dye aggregation, nonradiative energy transfer efficiencies reach a maximum value of nearly 40%. This value is quite high, taking into account the low fluorescence quantum yield of Pheo, Φ = 0.21, and results from the existence of high local concentrations of the acceptor within the supporting material. These results show that large energy transfer rates can exist in a system devoid of any special molecular organization. © 2006 American Society for Photobiology.
Registro:
Documento: |
Artículo
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Título: | Energy transfer among dyes on particulate solids |
Autor: | Rodriguez, H.B.; Iriel, A.; San Román, E. |
Filiación: | INQUIMAE/DQIAyQF, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Argentina Ciudad Universitaria, Pabellón II, C1428EHA Buenos Aires, Argentina
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Palabras clave: | cellulose; chlorophyll; coloring agent; drug derivative; methylene blue; pheophorbide a; chemistry; conference paper; energy transfer; spectrophotometry; Cellulose; Chlorophyll; Coloring Agents; Energy Transfer; Methylene Blue; Spectrophotometry |
Año: | 2006
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Volumen: | 82
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Número: | 1
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Página de inicio: | 200
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Página de fin: | 207
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DOI: |
http://dx.doi.org/10.1562/2005-07-08-RA-609 |
Título revista: | Photochemistry and Photobiology
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Título revista abreviado: | Photochem. Photobiol.
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ISSN: | 00318655
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CODEN: | PHCBA
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CAS: | cellulose, 61991-22-8, 68073-05-2, 9004-34-6; chlorophyll, 1406-65-1, 15611-43-5; methylene blue, 61-73-4; pheophorbide a, 15664-29-6; Cellulose, 9004-34-6; Chlorophyll, 1406-65-1; Coloring Agents; Methylene Blue, 61-73-4; pheophorbide a, 15664-29-6
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00318655_v82_n1_p200_Rodriguez |
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Citas:
---------- APA ----------
Rodriguez, H.B., Iriel, A. & San Román, E.
(2006)
. Energy transfer among dyes on particulate solids. Photochemistry and Photobiology, 82(1), 200-207.
http://dx.doi.org/10.1562/2005-07-08-RA-609---------- CHICAGO ----------
Rodriguez, H.B., Iriel, A., San Román, E.
"Energy transfer among dyes on particulate solids"
. Photochemistry and Photobiology 82, no. 1
(2006) : 200-207.
http://dx.doi.org/10.1562/2005-07-08-RA-609---------- MLA ----------
Rodriguez, H.B., Iriel, A., San Román, E.
"Energy transfer among dyes on particulate solids"
. Photochemistry and Photobiology, vol. 82, no. 1, 2006, pp. 200-207.
http://dx.doi.org/10.1562/2005-07-08-RA-609---------- VANCOUVER ----------
Rodriguez, H.B., Iriel, A., San Román, E. Energy transfer among dyes on particulate solids. Photochem. Photobiol. 2006;82(1):200-207.
http://dx.doi.org/10.1562/2005-07-08-RA-609