Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions

Autores
Altamirano, Marcela Susana; del Valle Bohorquez, María; Previtali, Carlos Mario; Chesta, Carlos Alberto
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Fil: Altamirano, Marcela Susana. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina
Fil: del Valle Bohorquez, María. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina
Fil: Previtali, Carlos Mario. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Chesta, Carlos Alberto. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Materia
CHARGE TRANSFER STATES
INDOLE
ISOOCTANE
PYRENE
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/241279
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane SolutionsAltamirano, Marcela Susanadel Valle Bohorquez, MaríaPrevitali, Carlos MarioChesta, Carlos AlbertoCHARGE TRANSFER STATESINDOLEISOOCTANEPYRENEhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The 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.Fil: Altamirano, Marcela Susana. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; ArgentinaFil: del Valle Bohorquez, María. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; ArgentinaFil: Previtali, Carlos Mario. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaFil: Chesta, Carlos Alberto. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; ArgentinaAmerican Chemical Society2008-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/241279Altamirano, 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; 589-5931089-5639CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/jp076294tinfo:eu-repo/semantics/altIdentifier/doi/10.1021/jp076294tinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:53:37Zoai:ri.conicet.gov.ar:11336/241279instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:53:37.35CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
title Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
spellingShingle Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
Altamirano, Marcela Susana
CHARGE TRANSFER STATES
INDOLE
ISOOCTANE
PYRENE
title_short Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
title_full Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
title_fullStr Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
title_full_unstemmed Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
title_sort Proton-Transfer Mediated Quenching of Pyrene/Indole Charge-Transfer States in Isooctane Solutions
dc.creator.none.fl_str_mv Altamirano, Marcela Susana
del Valle Bohorquez, María
Previtali, Carlos Mario
Chesta, Carlos Alberto
author Altamirano, Marcela Susana
author_facet Altamirano, Marcela Susana
del Valle Bohorquez, María
Previtali, Carlos Mario
Chesta, Carlos Alberto
author_role author
author2 del Valle Bohorquez, María
Previtali, Carlos Mario
Chesta, Carlos Alberto
author2_role author
author
author
dc.subject.none.fl_str_mv CHARGE TRANSFER STATES
INDOLE
ISOOCTANE
PYRENE
topic CHARGE TRANSFER STATES
INDOLE
ISOOCTANE
PYRENE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv 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.
Fil: Altamirano, Marcela Susana. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina
Fil: del Valle Bohorquez, María. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina
Fil: Previtali, Carlos Mario. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Chesta, Carlos Alberto. Universidad Nacional de Río Cuarto. Facultad de Ciencias Exactas Fisicoquímicas y Naturales. Departamento de Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
description 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.
publishDate 2008
dc.date.none.fl_str_mv 2008-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/241279
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
1089-5639
CONICET Digital
CONICET
url http://hdl.handle.net/11336/241279
identifier_str_mv 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
1089-5639
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/jp076294t
info:eu-repo/semantics/altIdentifier/doi/10.1021/jp076294t
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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