Potassium tetrafluoronickelate explained

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.

References

  1. 10.1107/S0108768193003246. Electron-Density Distribution in a Crystal of Potassium Tetrafluoronickelate, K2NiF4. 1993. Yeh. S. K.. Wu. S. Y.. Lee. C. S.. Wang. Y.. Acta Crystallographica Section B: Structural Science. 49. 5. 806–811.