| DOI | Trouver le DOI : https://doi.org/10.1139/v90-129 |
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| Auteur | Rechercher : Kelly, G.; Rechercher : Willsher, C.; Rechercher : Wilkinson, F.; Rechercher : Netto-Ferreira, J.; Rechercher : Olea, A.; Rechercher : Weir, D.; Rechercher : Johnston, Linda1; Rechercher : Scaiano, J. |
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| Affiliation | - Conseil national de recherches du Canada. Institut Steacie des sciences moléculaires du CNRC
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| Format | Texte, Article |
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| Résumé | Diphenylmethyl radicals have been generated by 266 nm laser excitation of 1,1,3,3-tetraphenylacetone adsorbed on silica gel and included in NaX and Silicalite zeolites and have been studied using diffuse reflectance laser flash photolysis techniques. The spectrum for the radical shows λmax at ~335 nm in all three supports and is similar to that in solution. The radicals decay over time scales that vary from hundreds of nanoseconds to minutes and there are indications that some radicals may be decaying on shorter time scales than we can monitor. The efficiency of oxygen quenching increases in going from Silicalite to NaX to silica gel, consistent with the greater accessibility of oxygen to silica gel pores as compared to the narrow channels in Silicalite. Laser dose and ketone loading effects were also examined for the various supports. Potential applications of a kinetic treatment of the data based on dispersive reaction kinetics are also discussed as a means of dealing with the problem of decay kinetics that occur over a wide range of time scales. |
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| Date de publication | 1990 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 12333611 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 7c655da3-7298-48dd-b417-b98e10ac4a6d |
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| Enregistrement créé | 2009-09-10 |
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| Enregistrement modifié | 2023-05-15 |
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