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• W2095421381 startingPage "844" @default.
• W2095421381 abstract "Quenching of photoexcited triplet-state anthracene through triplet−triplet (T−T) energy transfer mechanism by a few energy acceptors, azulene, ferrocene, and also anthracene in the ground state, is investigated in a dehydrated Na+ form of zeolite Y (NaY) with a transient absorption spectroscopy utilizing a diffuse reflectance detection technique. It is found that the decay curves of T−T absorption for anthracene follow unconventional kinetics that can be handled by a model based on the continuous time random walk (CTRW) theory. The analysis of the quenching kinetics affords an estimate of the intrazeolite self-diffusion coefficient for the guest aromatic species. Presently, a simplified version of the CTRW treatment is developed which enables us to extract information concerning the diffusivity only by analyzing the long time tail of triplet decay signals measured by a conventional photomultiplier detection system with limited time resolution. The self-diffusion coefficients thus obtained, ranging from 10-15 to 10-16 m2 s-1 in NaY at 298 K, are significantly smaller than those observed for benzene (10-10−10-13 m2 s-1). This study demonstrates that the triplet quenching method is a powerful technique for evaluating diffusion coefficients of relatively large organic molecules with small intrazeolite mobility that are hardly measurable by NMR and other traditional techniques." @default.
• W2095421381 created "2016-06-24" @default.
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• W2095421381 date "2002-01-01" @default.
• W2095421381 modified "2023-10-11" @default.
• W2095421381 title "Triplet−Triplet Energy Transfer as a Tool for Probing Molecular Diffusivity within Zeolites" @default.
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• W2095421381 doi "https://doi.org/10.1021/jp013461v" @default.
• W2095421381 hasPublicationYear "2002" @default.
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