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Abstract:

Singlet excited state deactivation of a zinc phthalocyanine (ZnPc), porphycene (Po) and tetrapropyl-porphycene (PrPo) by anionic tryptophan (Trp-) were investigated in cetyltrimethylammonium chloride (CTAC) micelles at pH 9.2 ± 0.1, regulated by a Tris buffer. Data obtained from steady-state experiments over a wide range of detergent and added NaCl concentrations were analyzed by using a pseudophase ion-exchange model (Abuin et al., J. Phys. Chem. 87, 5166-5172, 1983). The model was applied to derive singlet quenching rate constants for ZnPc and the porphycenes by Trp and the selectivity coefficient for Trp-/Cl- exchange at the micellar surface. The results point to an electron transfer quenching. Neutral tryptophan also quenches efficiently ZnPc fluorescence in CTAC without added buffer and Trp- does not deactivate the triplet state of these dyes. By flash photolysis, only the absorption of the triplet species was detected.

Registro:

Documento: Artículo
Título:Tryptophan Quenching of Zinc-Phthalocyanine and Porphycene Fluorescence in Micellar CTAC
Autor:Daraio, M.E.; Völker, A.; Aramendía, P.F.; San Román, E.
Filiación:Depto. de Quim. Inorganica, Analitica y Quim. Fis., Universidad de Buenos Aires, Buenos Aires, Argentina
Depto. de Quim. Inorganica, Analitica y Quim. Fis., Ciudad Universitaria, 1428 Buenos Aires, Argentina
Año:1998
Volumen:67
Número:4
Página de inicio:371
Página de fin:377
DOI: http://dx.doi.org/10.1111/j.1751-1097.1998.tb05213.x
Título revista:Photochemistry and Photobiology
Título revista abreviado:Photochem. Photobiol.
ISSN:00318655
CODEN:PHCBA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00318655_v67_n4_p371_Daraio

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Citas:

---------- APA ----------
Daraio, M.E., Völker, A., Aramendía, P.F. & San Román, E. (1998) . Tryptophan Quenching of Zinc-Phthalocyanine and Porphycene Fluorescence in Micellar CTAC. Photochemistry and Photobiology, 67(4), 371-377.
http://dx.doi.org/10.1111/j.1751-1097.1998.tb05213.x
---------- CHICAGO ----------
Daraio, M.E., Völker, A., Aramendía, P.F., San Román, E. "Tryptophan Quenching of Zinc-Phthalocyanine and Porphycene Fluorescence in Micellar CTAC" . Photochemistry and Photobiology 67, no. 4 (1998) : 371-377.
http://dx.doi.org/10.1111/j.1751-1097.1998.tb05213.x
---------- MLA ----------
Daraio, M.E., Völker, A., Aramendía, P.F., San Román, E. "Tryptophan Quenching of Zinc-Phthalocyanine and Porphycene Fluorescence in Micellar CTAC" . Photochemistry and Photobiology, vol. 67, no. 4, 1998, pp. 371-377.
http://dx.doi.org/10.1111/j.1751-1097.1998.tb05213.x
---------- VANCOUVER ----------
Daraio, M.E., Völker, A., Aramendía, P.F., San Román, E. Tryptophan Quenching of Zinc-Phthalocyanine and Porphycene Fluorescence in Micellar CTAC. Photochem. Photobiol. 1998;67(4):371-377.
http://dx.doi.org/10.1111/j.1751-1097.1998.tb05213.x