Ca(BF4)2·xH2O redefined from powder diffraction as hydrogen-bonded Ca(H2O)4(BF4)2 ribbons
1Le Mans Université, Institut des Molécules et des Matériaux du Mans, CNRS UMR 6283, Av. Olivier Messiaen, 72085 Le Mans, France.
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The crystal structure of the calcium bis(tetrafluoroborate) hydrate Ca(BF4)2·xH2O has been determined from laboratory powder diffraction data. The water molecules all belong to [CaO4F4] square antiprisms sharing F corners with [BF4] tetrahedra, forming a mono-dimensional structure of infinite ribbons interconnected by H...F and H...O hydrogen bonds. No place is found for interstitial water molecules, so that the compound has to be reformulated as Ca(H2O)4(BF4)2, which is isostructural with calcium perchlorate tetrahydrate, Ca(ClO4)2·4H2O.
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