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Acta Cryst. (2003). E59, i14-i16  [ doi:10.1107/S160053680300117X ]

Ammonium dipotassium hydrogen difluorophosphate at room temperature

J. Fábry, R. Krupková and I. Císarová

Abstract: (NH4)0.926K2.074[H(PO3F)2] crystallized from aqueous solution after mixing stoichiometric amounts of (NH4)2PO3F and K2PO3F in a 1:1 ratio. The structure contains two sites that are occupied by symmetry-independent cations; one site is occupied by potassium and ammonium in an approximate 1:1 ratio, while the other cation site is occupied exclusively by K. The anions are connected by a very short symmetry-restricted O...H...O hydrogen bond (~2.47  Å) into pairs [H(PO3F)2]3-. Ammonium is connected to anion O atoms by two- and three-centred N-H...O hydrogen bonds. Fluorines do not take part in the hydrogen-bond pattern.

Online 24 January 2003


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