Acta Cryst. (2010). E66, m928 [ doi:10.1107/S1600536810027133 ]
Abstract: The asymmetric unit of the title compound, [K(C5HF6N2)(H2O)2]n, is composed of two 3,5-bis(trifluoromethyl)pyrazolide anions, two potassium cations and four water molecules. The water molecules and 3,5-bis(trifluoromethyl)pyrazolide anions act as bridges between the potassium cations. Each potassium cation is surrounded by four O atoms [K-O = 2.705 (3)-2.767 (3) Å] and four F atoms [K-F = 2.870 (7)-3.215 (13) Å]. The water molecules and the 3,5-bis(trifluoromethyl)pyrazolide anions are connected by O-HN hydrogen bonds, forming layers in the ab plane. All -CF3 groups show rotational disorder between two orientations each.
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