Acta Cryst. (2013). E69, i20 [ doi:10.1107/S1600536813006041 ]
Abstract: Single crystals of the title compound, K2(HCO3)F·H2O, were obtained as a secondary product after performing flux synthesis experiments aimed at the preparation of potassium rare earth silicates. The basic building unit of the structure is an [(HCO3)(H2O)F]2- zigzag chain running parallel to . Both types of anions as well as the water molecules reside on mirror planes perpendicular to  at y = 0.25 and y = 0.75, respectively. Linkage between the different constituents of the chains is provided by O-HO and O-HF hydrogen bonding. The K+ cations are located between the chains and are coordinated by two F and five O atoms in form of a distorted monocapped trigonal prism.
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