Acta Cryst. (2001). E57, i90-i91  [ doi:10.1107/S160053680101501X ]

A new modification of diammonium hexafluorosilicate, (NH₄)₂SiF₆

J. Fábry, J. Chval and V. Petrícek

Abstract: A hexagonal modification (P6₃mc) of (NH₄)₂SiF₆ was grown accidentally. This new modification has the unit-cell c parameter doubled with respect to a previously reported trigonal form (Pm1) of the title compound. The H atoms in the present structure are ordered. Three or even four F atoms are hydrogen-bond acceptors for each H atom. The structure is isostructural with modifications of (NH₄)₂MnF₆, K₂GeF₆ and Rb₂GeF₆.

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