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Potassium hexafluoronickelate is an inorganic compound with the chemical formula K2NiF6. It can be produced through the reaction of potassium fluoride, nickel dichloride, and fluorine.
It reacts violently with water, releasing oxygen. It dissolves in anhydrous hydrogen fluoride to produce a light-red solution. Potassium hexafluoronickelate decomposes at 350 °C, forming potassium hexafluoronickelate, nickel fluoride, and fluorine:
Potassium hexafluoronickelate is a strong oxidant. It can turn chlorine pentafluoride and bromine pentafluoride into ClF6 and BrF6, respectively:
Potassium hexafluoronickelate decomposes at high temperatures to release fluorine gas; like terbium fluoride, the emitted fluorine is primarily monatomic rather than the typical diatomic.