Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 42, Pages 13786-13789Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b06986
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- EFree
- U.S. Department of Energy (DOE) Office of Science, Basic Energy Sciences (BES) [DE-SC0001057]
- DOE-NNSA [DE-NA0001974]
- DOE-BES [DE-FG02-99ER4S775]
- NSF
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- U.S. DOE [DE-ACS2-07NA27344]
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Through use of in situ Raman spectroscopy and single-crystal/powder X-ray diffraction, we resolve the C-0 phase structure discovered recently in the H-2 + H2O system. This phase forms at similar to 400 MPa and 280 K with the nominal composition (H2O)(2)H-2 and three formula units per unit cell. The hexagonal structure is chiral, consisting of interpenetrating spiral chains of hydrogen-bonded water molecules and rotationally disordered H-2 molecules, and shows topological similarities with the mineral quartz. Like other clathrate hydrates and forms of ice, the protons of H2O molecules within C-0 are disordered. The large zeolite-like channels accommodate significant amounts of hydrogen (5.3% by weight) in a unique hydrogen-bonded lattice, which might be applicable to the thermodynamic conditions found on icy planetary bodies.
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