Crystal Structure of Potassium Fluoride Tetrahydrate

Abstract
The crystal structure of KF·4H2O has been determined by x‐ray diffraction using the phase determination method of Hauptman and Karle. It is monoclinic and consists of edge and corner sharing K+(H2O)6 and F(H2O)6 octahedra. The similarity in the cation and anion coordination gives rise to pseudo‐orthorhombic symmetry. The K+···O distances are 2.79±0.02 Å. The F···(H)O distances range from 2.71 to 2.78 Å. The O(H)···O distances which link the octahedra are 2.82 and 2.85 Å.