Artículo
Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
Altamirano, Marcela Susana; del Valle Bohorquez, María; Previtali, Carlos Mario
; Chesta, Carlos Alberto
![Icon](/themes/CONICETDigital/images/conicet.png)
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
02/2008
Editorial:
American Chemical Society
Revista:
Journal of Physical Chemistry A
ISSN:
1089-5639
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The fluorescence quenching of pyrene (Py) by a series of N-methyl and N-H substituted indoles was studied in isooctane at 298 K. The fluorescence quenching rate constants were evaluated by mean of steady-state and time-resolved measurements. In all cases, the quenching process involves a charge-transfer (CT) mechanism.The Io/I and to/t Stern-Volmer plots obtained for the N-H indoles show a very unusual upward deviation with increasing concentration of the quenchers. This behavior is attributed to the self-quenching of the CT intermediates by the free indoles in solution. The efficiency of quenching of the polyaromatic by the N-H indoles increases abruptly in the presence of small amount of added pyridine (or propanol). A detailed analysis of the experimental data obtained in the presence of pyridine provides unambiguous evidence that the selfquenching process involves proton transfer from the CT states to indoles.
Palabras clave:
CHARGE TRANSFER STATES
,
INDOLE
,
ISOOCTANE
,
PYRENE
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Citación
Altamirano, Marcela Susana; del Valle Bohorquez, María; Previtali, Carlos Mario; Chesta, Carlos Alberto; Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions; American Chemical Society; Journal of Physical Chemistry A; 112; 4; 2-2008; 589-593
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