The fluoronickelates are a class of chemical compounds containing an anion with nickel at its core, surrounded by fluoride ions which act as ligands. This makes it a
fluoroanion
In chemistry, a fluoroanion or fluorometallate anion is a polyatomic anion that contains one or more fluorine atoms. The ions and salts form from them are also known as complex fluorides. They can occur in salts, or in solution, but seldom as pu ...
. The nickel atom can be in a range of oxidation states from +2, +3 to +4.
The hexafluoronickelate(IV)
2− ion NiF
62− contains nickel in the maximal +4 state, and is in octahedral coordination by the fluoride atoms. It forms a commercially available salt
Potassium hexafluoronickelate(IV) K
2NiF
6. Solid double salts can also contain
tetrafluoronickelate NiF
4 eg K
2NiF
4.
References
{{fluorine compounds
Nickel complexes
Fluoro complexes
Fluorometallates