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Titolo:
Naphthalene included within all-silica zeolites: Influence of the host on the naphthalene photophysics
Autore:
Marquez, F; Zicovich-Wilson, CM; Corma, A; Palomares, E; Garcia, H;
Indirizzi:
Univ Politecn Valencia, Inst Tecnol Quim, CSIC, Valencia 46022, Spain UnivPolitecn Valencia Valencia Spain 46022 CSIC, Valencia 46022, Spain
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 41, volume: 105, anno: 2001,
pagine: 9973 - 9979
SICI:
1520-6106(20011018)105:41<9973:NIWAZI>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESOLVED DIFFUSE REFLECTANCE; LASER FLASH-PHOTOLYSIS; INTRAZEOLITE PHOTOCHEMISTRY; AROMATIC-HYDROCARBONS; ACID ZEOLITES; SOLID-STATE; CONFINEMENT; ANTHRACENE; SYSTEMS; CATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Marquez, F Univ Politecn Valencia, Inst Tecnol Quim, CSIC, Av Naranjos S-n, Valencia 46022, Spain Univ Politecn Valencia Av Naranjos S-n Valencia Spain 46022 in
Citazione:
F. Marquez et al., "Naphthalene included within all-silica zeolites: Influence of the host on the naphthalene photophysics", J PHYS CH B, 105(41), 2001, pp. 9973-9979

Abstract

The photophysical properties of naphthalene within pure silica zeolites were studied by means of diffuse reflectance, steady state and time resolved emission spectroscopy, fluorescence polarization, and FT-Raman spectroscopy. The experimental results indicate that naphthalene is strongly affected by the zeolite host. This distortion is reflected in the bathochromic shift of the 0-0 transition, the shortening of the fluorescence lifetimes, the observation of vibronic couplings, the appearance of room temperature phosphorescence, and the shift to lower vibration energy of the Raman peaks due tothe weakening of the naphthalene bonds. The electronic structure of naphthalene within different zeolites has been computed on periodic models by using both the Hartree-Fock and the Kohn-Sham theories and the theoretical 0-0transitions evaluated from the valence and conduction bands. The theoretical results are in agreement with the experimental observation of a red shift of the 0-0 bands indicating that the naphthalene pi electrons are affected by confinement effect.

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Documento generato il 11/07/20 alle ore 06:51:57