Potassium tetrafluoronickelate
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Properties | |
F4K2Ni | |
Molar mass | 212.8836 g·mol−1 |
Appearance | green solid |
Density | 3.36 g/cm3 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Potassium tetrafluoronickelate is the inorganic compound with the formula K2NiF4. It features octahedral (high spin) Ni centers with Ni-F bond lengths of 2.006 Å. This green solid is a salt of tetrafluoronickelate. It is prepared by melting a mixture of nickel(II) fluoride, potassium fluoride, and potassium bifluoride.[1] The compound adopts a perovskite-like structure consisting of layers of octahedral Ni centers interconnected by doubly bridging fluoride ligands. The layers are interconnected by potassium cations. It is one of the principal Ruddlesden-Popper phases. Early discoveries on cuprate superconductors focused on compounds with structures closely related to K2NiF4, e.g. lanthanum cuprate and derivative lanthanum barium copper oxide.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/45/73450-ICD_K2NiF4.png/220px-73450-ICD_K2NiF4.png)
References
[edit]- ^ Yeh, S. K.; Wu, S. Y.; Lee, C. S.; Wang, Y. (1993). "Electron-Density Distribution in a Crystal of Potassium Tetrafluoronickelate, K2NiF4". Acta Crystallographica Section B: Structural Science. 49 (5): 806–811. doi:10.1107/S0108768193003246.