Molecular tectonics

References

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• The estimated pore sizes correspond to distances between van der Waals surfaces of opposing walls defined by a projection along the channel axis.
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• For comparison, pore sizes in zeolites normally range from approximately 4 to 13 Å, and void volumes are typically less than 50%.10 The cylindrical channels in urea clathrates are nearly 5 Å in diameter, and the void volumes are approximately 30%.11
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• Volumes occupied by guests were estimated by using the stoichiometry of the clathrate, its calculated density, and the density of the pure guest at 25°C.
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• Wang , X. , Simard , M. and Wuest , J. D. unpublished results.
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• The interpenetrating networks in the expanded diamondoid lattice of clathrate 10 · 2 CH3CH2CH2CH2COOH are slightly offset along the channel axis, so the pores are somewhat smaller than those in clathrate 8 · 2 CH3CH2CH2COOH.
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• Periodic enlargements in the channels provide additional space for the enclathration of valeric acid.
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