A site-selective spectroscopy of naphthalene and quinoline in TEOS/MTEOS xerogels.
Fluorescence and phosphorescence spectra and decay times are recorded upon a narrow-band laser excitation for naphthalene (N) and quinoline (Q) embedded in xerogels prepared from MTEOS/TEOS mixtures, in the 10-300 K temperature range. A site selectivity of the excitation is observed at T <120 K and T <150 K, for N and Q, respectively. In the case of quinoline, different families of sites are characterized. The results are discussed in terms of comparison with the N and Q emission behaviour in other environments, especially in rare-gas matrices.
Laboratoire de Photophysique Moléculaire du CNRS, Bât 210 Universite Paris-Sud, 91405 Orsay Cedex, France. claudine.crepin-gilbert@ppm.u-psud.fr
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C
Crépin
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Dubois
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F
Goldfarb
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F
Chaput
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JP
Boilot