Ne- and O2-filled ice XVII: a neutron diffraction study
Literature Information
Michele Catti, Leonardo del Rosso, Lorenzo Ulivi, Milva Celli, Francesco Grazzi, Thomas C. Hansen
Deuterated ice XVII, a metastable solid water polymorph, was filled with Ne and O2 at p ≈ 100 kPa and studied by in situ neutron diffraction (ILL, France). Powder patterns were collected in the ranges of 20–50 K (Ne) and 4.6–90 K (O2). Rietveld refinement and difference Fourier techniques showed that the gas molecules were located inside the hexagonal channels of the host ice. Both Ne atoms and O2 molecules are arranged in a spiral-like configuration off the channel axis, preserving the P6122 symmetry of the host in the case of Ne, but reducing it to P61 in O2. A larger Ne absorption compared to Ne-filled ice II is observed, which is consistent with longer host–guest contacts producing smaller hydrophobic repulsion. In O2-filled ice XVII, instead, short O–D distances (2.37 Å) have attractive character and stabilize the structure.
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