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- W2077883827 abstract "The motions of the perdeuterated C-6 hydrocarbons benzene, hexane and cyclohexane have been examined in the pores of zeolite L by use of2H NMR techniques. The pore dimensions of this particular zeolite framework type are such that typically only one or two of these C-6 molecules can reside in any given pore, providing an opportunity to study the motion of a given molecule in the presence of the constraining walls of the zeolite, cationic species which coexist in the pore, and at most one other molecule. For the base case, chosen to be K-L zeolite (i.e. exchangeable cations are potassium) with one molecule per unit cell, a study of the2H NMR of the perdeuterated guest molecules shows no evidence of isotropic motion on the time scale of the2H NMR experiment (about 1 μs), presumably as a result of the constraining influence of the pore walls. Internal molecular degrees of freedom are observed, even at relatively low temperatures (about 150 K): C6 spinning for benzene, C3 spinning for cyclohexane, and rotation about the carboncarbon bond axes for hexane. In addition, transitions between conformations of the cyclohexane molecule become sufficiently rapid to influence the2H NMR spectrum for temperatures above 275 K. Libration and site hopping (for benzene) are also observed at higher temperatures. Higher guest densities (two molecules per unit cell) introduce correlation effects in the guest motions, and varying the non-framework cations (Li+, K+, Cs+) also influences the dynamics of the molecules." @default.
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- W2077883827 date "1993-06-01" @default.
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- W2077883827 title "Cation and loading effects on motion of C-6 hydrocarbon guests in L zeolites" @default.
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- W2077883827 doi "https://doi.org/10.1016/0927-7757(93)80453-l" @default.
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