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Ferricyanide

Anion in which a Fe3+ ion is complexed by 6 CN– ions


Anion in which a Fe3+ ion is complexed by 6 CN– ions

Ferricyanide is the name of the anion . It is also called hexacyanoferrate(III) and in rare, but systematic nomenclature, hexacyanidoferrate(III). The most common salt of this anion is potassium ferricyanide, a red crystalline material that is used as an oxidant in organic chemistry.

Properties

consists of a center bound in octahedral geometry to six cyanide ligands. The complex has Oh symmetry. The iron is low-spin and easily reduced to the related ferrocyanide ion , which is a ferrous () derivative. This redox couple is reversible and entails no making or breaking of Fe–C bonds: : This redox couple is a standard in electrochemistry.

Compared to main group cyanides like potassium cyanide, ferricyanides are much less toxic because of the strong bond between the cyanide ion () and the . They do react with mineral acids, however, to release highly toxic hydrogen cyanide gas.

Uses

Treatment of ferricyanide with iron(II) salts affords the brilliant, long-lasting pigment Prussian blue, the traditional color of blueprints.

References

References

  1. (October 2011). "Cyano Compounds, Inorganic".
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