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 ...
:
:
Potassium hexafluoronickelate is a strong oxidant. It can turn
chlorine pentafluoride and
bromine pentafluoride into and , respectively:
:
:( 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 K
2PtCl
6 and Mg
2FeH
6.
[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
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