Ferricyanide is the name of the anion [Fe(CN)6]3−. 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.
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| IUPAC name iron(3+) hexacyanide | |
| Systematic IUPAC name hexacyanidoferrate(III) | |
| Other names ferric hexacyanide; hexacyanidoferrate(3−); hexacyanoferrate(III) | |
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| Properties | |
Chemical formula | [Fe(CN)6]3− |
| Related compounds | |
Other cations | Hexacyanonickelate(III) |
Related compounds | Ferrocyanide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references | |
Properties
[Fe(CN)6]3− consists of a Fe3+ 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 [Fe(CN)6]4−, which is a ferrous (Fe2+) derivative. This redox couple is reversible and entails no making or breaking of Fe–C bonds:
- [Fe(CN)6]3− + e− ⇌ [Fe(CN)6]4−
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 (CN−) and the Fe3+. 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.
See also
- Potassium ferricyanide
- Ferrocyanide
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