Abstract
Clathrate hydrates, ice-like host–guest systems containing guest molecules in cages of hydrogen-bonded water molecules exist in three well-characterized cubic forms, and a less well-characterized tetragonal form1,2. On the basis of 2H and l29Xe NMR measurements and X-ray and neutron powder diffraction results, we now report a new hexagonal hydrate structure requiring both large and small guest molecules to stabilize the structure. This hydrate is expected to be isostructural with the hexagonal clathrasil dodecasil-lH (see ref. 14 for clathrasil nomenclature). As for the cubic clathrate hydrates, the new hydrate structure may occur naturally.
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Ripmeester, J., Tse, J., Ratcliffe, C. et al. A new clathrate hydrate structure. Nature 325, 135–136 (1987). https://doi.org/10.1038/325135a0
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DOI: https://doi.org/10.1038/325135a0
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