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Artículo

Effect of the interface on the photophysics of eosin-Y in reverse miceles

Arbeloa, Ernesto MaximilianoIcon ; Porcal, Gabriela ValeriaIcon ; Bertolotti, Sonia GracielaIcon ; Previtali, Carlos MarioIcon
Fecha de publicación: 01/2013
Editorial: Elsevier Science Sa
Revista: Journal of Photochemistry and Photobiology A: Chemistry
ISSN: 1010-6030
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Físico-Química, Ciencia de los Polímeros, Electroquímica; Físico-Química, Ciencia de los Polímeros, Electroquímica

Resumen

The photophysics of the xanthene dye eosin-Y (Eos) was studied in reverse micelles (RMs) of sodium 1,4-bis (2-ethylhexyl) sulfosuccinate (AOT) and benzylhexadecyldimethylammonium chloride (BHDC). Special interest was assigned to the effect of organization on the triplet state properties. In the reverse micellar media both the absorption and emission spectra of the dye present a red shift with respect to water. It is concluded that Eos in both reverse micellar systems is localized in the interface. Although this is predictable in BHDC due to the positive charge at the interface and the negative charge of the dye, it is notable in the case of the negative interface of AOT. In this case it may be concluded that Eos resides in the interface co-micellizing with the surfactant, although more exposed to water than in the case of BHDC.<br />Triplet state decay kinetics and absorption spectra were determined by laser flash photolysis. The triplet lives longer in RMs than in homogeneous solvents. The compartmentalization of the dye precludes the auto-quenching which shorts the lifetime in homogeneous solvents. The quenching by aliphatic amines was also investigated. The hydrophilic triethanolamine (TEOA) is localized in the water pool, and the triplet quenching is more efficient than in homogeneous solvents. On the other hand the quenching by tributylamine (TBA) which is located in the bulk organic solvent is much less efficient. The quenching by TEOA in RMs can be understood in terms of an exchange mechanism between micelles. Quantum yields of radicals produced in the triplet quenching process were determined.
Palabras clave: EOSIN-Y , PHOTOPHYSICS , TRIPLET STATE , REVERSE MICELLES
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/94116
URL: https://www.sciencedirect.com/science/article/pii/S1010603012005424
DOI: https://doi.org/10.1016/j.jphotochem.2012.11.003
Colecciones
Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Citación
Arbeloa, Ernesto Maximiliano; Porcal, Gabriela Valeria; Bertolotti, Sonia Graciela; Previtali, Carlos Mario; Effect of the interface on the photophysics of eosin-Y in reverse miceles; Elsevier Science Sa; Journal of Photochemistry and Photobiology A: Chemistry; 252; 1-2013; 31-36
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