Slow Interfacial Electron Hole Transfer ...
Type de document :
Article dans une revue scientifique: Article original
DOI :
URL permanente :
Titre :
Slow Interfacial Electron Hole Transfer of atrans-Stilbene Radical Cation Photoinduced in a Channel of Nonacidic Aluminum Rich ZSM-5 Zeolite
Auteur(s) :
Moissette, Alain [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Brémard, Claude [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Hureau, Matthieu [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Vezin, Herve [Auteur]
Laboratoire de Chimie Organique et Macromoleculaire [UMR CNRS 8009]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Brémard, Claude [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Hureau, Matthieu [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Vezin, Herve [Auteur]
Laboratoire de Chimie Organique et Macromoleculaire [UMR CNRS 8009]
Titre de la revue :
Journal of Physical Chemistry C
Nom court de la revue :
J. Phys. Chem. C
Numéro :
111
Pagination :
2310-2317
Éditeur :
American Chemical Society (ACS)
Date de publication :
2007-02
ISSN :
1932-7455
Mot(s)-clé(s) en anglais :
Zeolites
Electron paramagnetic resonance spectroscopy
Resonance structures
Cations
Lasers
Electron paramagnetic resonance spectroscopy
Resonance structures
Cations
Lasers
Discipline(s) HAL :
Chimie/Chimie théorique et/ou physique
Résumé en anglais : [en]
trans-Stilbene (t-St) is incorporated as an intact molecule without solvent in the medium size channel of nonacidic aluminum rich Na6.6ZSM-5 zeolite with Na6.6(SiO2)89.4(AlO2)6.6 formula per unit cell. The interaction ...
Lire la suite >trans-Stilbene (t-St) is incorporated as an intact molecule without solvent in the medium size channel of nonacidic aluminum rich Na6.6ZSM-5 zeolite with Na6.6(SiO2)89.4(AlO2)6.6 formula per unit cell. The interaction between Na+ cation and t-St occurs through one phenyl group facially coordinated to the Na+ cation near the O atoms binding Al atoms. The similarity between Raman spectra of t-St in solution and occluded in Na6.6ZSM-5 shows that the motion of t-St in the channel approaches at room temperature the isotropic limit characteristic of a liquid. The laser UV (266 nm) photoionization generates a primary t-St•+-electron pair as a fast phenomenon. These charge carriers exhibit lifetimes that extend over less than 1 h at room temperature and disappear according to two parallel competitive ways: direct charge recombination and electron transfer. This subsequent electron-transfer takes place between the electron deficient radical cation (t-St•+) and the electron donor oxygen atom of the zeolite framework. The aluminum rich Na6.6ZSM-5 zeolite hinders efficiently the charge recombination and promotes the electron transfer to generate a very long electron−hole pair which exceeds several hours at room temperature. A one laser Resonance Raman experiment using exciting lines within the contour of the unique three band visible absorption spectrum characterizes the ground state as t-St@ZSM-5•+•-. The three UV bands at 512, 558, and 613 nm correspond to a vibrational progression of the 1600 cm-1 mode (C−C stretching) in the excited state. A two laser resonance Raman experiment characterizes the excited-state as a t-St•+@ZSM-5•- radical cation electron pair.Lire moins >
Lire la suite >trans-Stilbene (t-St) is incorporated as an intact molecule without solvent in the medium size channel of nonacidic aluminum rich Na6.6ZSM-5 zeolite with Na6.6(SiO2)89.4(AlO2)6.6 formula per unit cell. The interaction between Na+ cation and t-St occurs through one phenyl group facially coordinated to the Na+ cation near the O atoms binding Al atoms. The similarity between Raman spectra of t-St in solution and occluded in Na6.6ZSM-5 shows that the motion of t-St in the channel approaches at room temperature the isotropic limit characteristic of a liquid. The laser UV (266 nm) photoionization generates a primary t-St•+-electron pair as a fast phenomenon. These charge carriers exhibit lifetimes that extend over less than 1 h at room temperature and disappear according to two parallel competitive ways: direct charge recombination and electron transfer. This subsequent electron-transfer takes place between the electron deficient radical cation (t-St•+) and the electron donor oxygen atom of the zeolite framework. The aluminum rich Na6.6ZSM-5 zeolite hinders efficiently the charge recombination and promotes the electron transfer to generate a very long electron−hole pair which exceeds several hours at room temperature. A one laser Resonance Raman experiment using exciting lines within the contour of the unique three band visible absorption spectrum characterizes the ground state as t-St@ZSM-5•+•-. The three UV bands at 512, 558, and 613 nm correspond to a vibrational progression of the 1600 cm-1 mode (C−C stretching) in the excited state. A two laser resonance Raman experiment characterizes the excited-state as a t-St•+@ZSM-5•- radical cation electron pair.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CNRS
CNRS
Collections :
Date de dépôt :
2021-06-18T09:01:25Z
2021-10-08T12:40:17Z
2021-10-08T12:40:17Z