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dc.contributor.author
Porcal, Gabriela Valeria
dc.contributor.author
Arbeloa, Ernesto Maximiliano
dc.contributor.author
Orallo, Dalila Elisabet
dc.contributor.author
Bertolotti, Sonia Graciela
dc.contributor.author
Previtali, Carlos Mario
dc.date.available
2024-08-01T11:08:44Z
dc.date.issued
2011-12
dc.identifier.citation
Porcal, Gabriela Valeria; Arbeloa, Ernesto Maximiliano; Orallo, Dalila Elisabet; Bertolotti, Sonia Graciela; Previtali, Carlos Mario; Photophysics of safranine-O and phenosafranine in reverse micelles of BHDC; Elsevier Science SA; Journal of Photochemistry and Photobiology A: Chemistry; 226; 1; 12-2011; 51-56
dc.identifier.issn
1010-6030
dc.identifier.uri
http://hdl.handle.net/11336/241426
dc.description.abstract
The photophysics of safranine-O (3,7-diamino-2,8-dimethyl-5 phenyl phenazinium chloride, SF) and phenosafranine (3,7-diamino-5-phenyl phenazinium chloride, PSF) was investigated in reverse micelles (RMs) of the cationic surfactant benzyl hexadecyl dimethylammonium chloride (BHDC). The excited singlet state properties were measured by absorption and fluorescence spectroscopy. All the measurements indicate that both dyes are localized in the interface, sensing a medium of lower polarity than water. Stokes? shift increases and fluorescence quantum yield decreases with increasing the water content, but never reach the values or pure water. The triplet state properties of the dyes in RMs were investigated by laser flash photolysis. The maximum of the T?T absorption spectra in RMs confirms that, in spite of their positive charge, the dyes remain at the interface co-micellizing with BHDC. The triplet lifetime is much longer in the RMs than in homogeneous organic solvents. The two dyes present a different dependence of their photophysical properties with the water content. The two methyl groups in the ring of SF produce a stronger preference of the dye for a hydrophobic environment, and consequently a deeper location in the interface closer to the organic phase. A remarkable difference is observed in the triplet quenching by aliphatic amines. While the quenching by hydrophobic tributylamine is much lower in BHDC/benzene RMs than in a homogeneous solvent, the hydro soluble triethanolamine is near two orders of magnitude more effective in the RMs than in homogeneous solution. This is explained by the different local concentration of the amines in the interface.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science SA
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Safranine
dc.subject
Phenosafranine
dc.subject
Reverse micelles
dc.subject
Photophysics
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
dc.subject.classification
Ciencias Químicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Photophysics of safranine-O and phenosafranine in reverse micelles of BHDC
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-07-30T13:19:51Z
dc.journal.volume
226
dc.journal.number
1
dc.journal.pagination
51-56
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Porcal, Gabriela Valeria. Universidad Nacional de Rio Cuarto. Facultad de Ciencias Exactas Fisicoquimicas y Naturales. Departamento de Quimica. Area Fisicoquimica Organica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
dc.description.fil
Fil: Arbeloa, Ernesto Maximiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Rio Cuarto. Facultad de Ciencias Exactas Fisicoquimicas y Naturales. Departamento de Quimica. Area Fisicoquimica Organica; Argentina
dc.description.fil
Fil: Orallo, Dalila Elisabet. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
dc.description.fil
Fil: Bertolotti, Sonia Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Rio Cuarto. Facultad de Ciencias Exactas Fisicoquimicas y Naturales. Departamento de Quimica. Area Fisicoquimica Organica; Argentina
dc.description.fil
Fil: Previtali, Carlos Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Rio Cuarto. Facultad de Ciencias Exactas Fisicoquimicas y Naturales. Departamento de Quimica. Area Fisicoquimica Organica; Argentina
dc.journal.title
Journal of Photochemistry and Photobiology A: Chemistry
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1010603011004394
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jphotochem.2011.10.014
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