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Potassium hexafluoronickelate(IV) is an inorganic compound with the chemical formula . It can be produced through the reaction of potassium fluoride, nickel dichloride, and
fluorine Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative reactive element, it is extremely reacti ...
. It reacts violently with water, releasing oxygen. It dissolves in anhydrous
hydrogen fluoride Hydrogen fluoride (fluorane) is an inorganic compound with the chemical formula . This colorless gas or liquid is the principal industrial source of fluorine, often as an aqueous solution called hydrofluoric acid. It is an important feedstock i ...
to produce a light-red solution. Potassium hexafluoronickelate(IV) decomposes at 350 °C, forming potassium hexafluoronickelate(III), nickel(II) fluoride, and
fluorine Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative reactive element, it is extremely reacti ...
: :\rm \ 3 K_2NiF_6 \xrightarrow 2 K_3NiF_6 + NiF_2 + F_2 Potassium hexafluoronickelate is a strong oxidant. It can turn chlorine pentafluoride and bromine pentafluoride into and , respectively: :\rm \ K_2NiF_6 + 5 AsF_5 + XF_5 \xrightarrow XF_6AsF_6 + Ni(AsF_6)_2 + 2KAsF_6 :( X = Cl or Br , -60 °C , aHF = anhydrous hydrogen fluoride). Potassium hexafluoronickelate decomposes at high temperatures to release fluorine gas; like
terbium(IV) fluoride Terbium(IV) fluoride is an inorganic compound with a chemical formula TbF4. It is a white solid that is a strong oxidizer. It is also a strong fluorinating agent, emitting relatively pure atomic fluorine when heated, rather than the mixture of flu ...
, the emitted fluorine is primarily monatomic rather than the typical diatomic. It adopts the structure seen for K2PtCl6 and Mg2FeH6.Taylor, J. C. "A comparison of profile decomposition and Rietveld methods for structurtal refinement with powder diffraction data" Zeitschrift für Kristallographie 1987, volume 181, p151-160.


References

Potassium compounds Nickel complexes Fluoro complexes {{Inorganic-compound-stub