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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