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KHfF5: a new representative in the MIMIVF5 family
Oksana P Grigorieva1, Viktor A Tafeenko1, Peter S Berdonosov1
1Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, Moscow 119991, Russian Federation.
Abstract:
We report the preparation and crystal structure of potassium hafnium pentafluoride, KHfF5, obtained by the hydrothermal technique. The compound crystallizes in the orthorhombic noncentrosymmetric space group P212121, with the unit-cell parameters a = 6.2843 (3), b = 7.8063 (3) and c = 15.8286 (7) Å. Hf atoms are coordinated by eight F atoms, forming square antiprismatic polyhedra. Bonding in pairs, HfF8 antiprisms are interconnected via common F-atom edges and form a double chain of hafnium polyhedra. A comparison of the structure of KHfF5 with other complex fluorides of alkali metals and hafnium, zirconium or terbium(IV) revealed that this compound has no isostructural analogue among the known phases of general composition MIMIVF5.
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