Acta Cryst. (2007). E63, i198  [ doi:10.1107/S1600536807058278 ]

Rubidium potassium hexafluoridozirconate(IV) bis(hydrogen fluoride), Rb_2-xK_xZrF₆·2HF (x = 0.4171)

A. V. Gerasimenko, N. A. Didenko and V. Y. Kavun

Abstract: The title compound is built from edge-sharing centrosymmetric dimeric [Zr₂F₁₂]^4- complexes, HF molecules, Rb⁺ and K⁺ cations. Rubidium and potassium ions are statistically disordered on one of the metal positions. The Zr^IV coordination polyhedron is a monocapped trigonal prism. The two crystallographically independent Rb(K) ions are coordinated by F atoms and HF molecules with coordination numbers 7 and 9, respectively, for the two sites. In addition, the structure is stabilized by strong F-HF hydrogen bonds.

Online 21 November 2007

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