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The crystal structures of the isotypic phases HEF 6  · 5H 2 O · HF with E = P, As, and Sb have been redetermined from single-crystal Mo Kα  diffractometer data and refined to unweighted  R  values of 0.030, 0.024, and 0.042, respectively. The crystal data (cubic crystal system, space group  Im [unk]m,  Z  = 2) and most structural features have been confirmed. The cell constants  a , measured at low temperatures, are 7.544(2) Å at 107 K, 7.665(3) Å at 98 K, and 7.777(4) Å at 108 K, respectively. – The polyhedral clathrate hydrates have cationic, i.e. protonated, and hydrogen fluoride containing host structures with only one kind of polyhedral voids: truncated octahedra ([4 6 6 8 ] polyhedra) of von Fedorov. In these voids the deprotonated acid molecules are enclosed as anionic guests EF[unk]. In contrast to an earlier study the orientational disorder of the anions is described as fourfold in all three compounds.

Die isotypen Phasen HEF 6 · 5H 2 O · HF (E = P, As, Sb): Neubestimmung der Strukturen an Einkristallen 1