Distributions of site-hopping geometries and rates for benzene adsorbed on Ag-Y zeolite
Distributions of site-hopping geometries and rates for benzene adsorbed on Ag-Y zeolite
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DOI：
10.1021/jp990953n
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发表时间：
1999-08-26
影响因子：
2.9
通讯作者：
Chmelka, BF
中科院分区：
文献类型：
--
作者：
Gédéon, A;Favre, DE;Chmelka, BF
Slow jump reorientation dynamics of benzene molecules adsorbed on Ag-Y zeolite (Si/Al = 2.4) have been investigated using solid-state nuclear magnetic resonance (NMR) spectroscopy. Multidimensional exchange C-13 NMR techniques establish that the benzene jump angle distribution is broad and that multiple benzene reorientation rates exist for site exchange among different local environments. Modeling of H-2 and C-13 NMR line shapes yields an apparent activation energy of 34 +/- 2 kJ/mol and a preexponential factor of k(0) = 2 x 10(10) s(-1) (+/- 1/2 decade) for the complicated molecular reorientation motions underlying benzene site-hopping dynamics in Ag-Y zeolite.
