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Title: Ferricyanide  
Author: World Heritage Encyclopedia
Language: English
Subject: Prussian blue, Coordination sphere, Anions, Metallate, Cyanides
Collection: Anions, Coordination Compounds, Cyanides
Publisher: World Heritage Encyclopedia


IUPAC name
iron(3+) hexacyanide
Systematic IUPAC name
Other names
ferric hexacyanide; hexacyanidoferrate(3-); hexacyanoferrate(III)
Jmol-3D images Image
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 Y  (: Y/N?)

Ferricyanide is the

See also

  1. ^ Gail, E.; Gos, S.; Kulzer, R.; Lorösch, J.; Rubo, A.; Sauer, M.; Kellens, R.; Reddy, J.; Steier, N.; Hasenpusch, W. (October 2011). "Cyano Compounds, Inorganic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH.  


Treatment of ferricyanide with ferrous salts affords the brilliant, long-lasting pigment Prussian blue, the traditional color of blueprints.


Compared to normal cyanides like potassium cyanide, ferricyanides are much less toxic because of the tight hold of the CN to the Fe3+. They do react with mineral acids, however, to release highly toxic hydrogen cyanide gas.

This redox couple is a standard in electrochemistry.

[Fe(CN)6]3− + e → [Fe(CN)6]4−

[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:



  • Properties 1
  • Uses 2
  • References 3
  • See also 4


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