Artículo
Solvatochromic effects on the fluorescence and triplet–triplet absorption of phenosafranine in protic and aprotic solvents
Broglia, Martin Federico
; Bertolotti, Sonia Graciela
; Previtali, Carlos Mario
; Montejano, Hernan Alfredo
Fecha de publicación:
05/2006
Editorial:
Elsevier Science SA
Revista:
Journal of Photochemistry and Photobiology A: Chemistry
ISSN:
1010-6030
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Photophysical and spectroscopic properties of phenosafranine were investigated in 21 solvents, including pure aprotic solvents and pure and binary protic solvent mixtures. It was found that these properties are highly dependent of the nature of the medium in protic solvents. Characteristic parameters such as the Stokes¡¯ shift, the fluorescence quantum yield and lifetime and the T¨CT absorption maxima frequencies showed a very clean solvent dependence, with a strong incidence of the specific interactions of phenosafranine with solvent molecules, most likely through hydrogen bonding. On the other hand, in aprotic solvents these parameters are practically insensitive to changes in solvent properties. The experimental results in protic media suggest an increase of the dipole moment of the dye molecule as a consequence of the S0¡úS1 transition, while a decrease in the dipole moment come along with the T1¡úTn transition. In selected protic solvents, the photophysical kinetic parameters were obtained from fluorescence quantum yield and lifetime determinations and intersystem-crossing quantum yields. Their solvent dependence is discussed.0¡úS1 transition, while a decrease in the dipole moment come along with the T1¡úTn transition. In selected protic solvents, the photophysical kinetic parameters were obtained from fluorescence quantum yield and lifetime determinations and intersystem-crossing quantum yields. Their solvent dependence is discussed.
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Citación
Broglia, Martin Federico; Bertolotti, Sonia Graciela; Previtali, Carlos Mario; Montejano, Hernan Alfredo; Solvatochromic effects on the fluorescence and triplet–triplet absorption of phenosafranine in protic and aprotic solvents; Elsevier Science SA; Journal of Photochemistry and Photobiology A: Chemistry; 180; 1-2; 5-2006; 143-149
Compartir
Altmétricas