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Ferricyanide
 
 
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Ferricyanide is the name for the anion [Fe(CN)6]3-. Its systematic name
Systematic name

There are millions of possible objects that can be described in science, too many to create common names for every one. As a response, a number of systems of systematic names have been created....
 is hexacyanoferrate(III) ion. The most common salt of this anion is potassium ferricyanide
Potassium ferricyanide

Potassium ferricyanide is the chemical compound with the formula K3[Fe6]. This bright red salt consists of the coordination compound ferricyanide....
, a red crystalline material that is used as an oxidant in organic chemistry
Organic chemistry

Organic chemistry is a discipline within chemistry which involves the science study of the structure, properties, composition, chemical reaction, and preparation of chemical compounds that contain carbon....
.

[Fe(CN)6]3- consists of an Fe3+ center bound in octahedral geometry to six cyanide
Cyanide

A cyanide is any chemical compound that contains the nitrile , which consists of a carbon atom chemical bond to a nitrogen atom. Inorganic cyanides are hydrogen cyanide salts in which cyanide is generally the anion CN-....
 ligand
Ligand

In chemistry, a ligand is either an atom, ion, or molecule that bonds to a central metal, generally involving formal donation of one or more of its electrons....
s.






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Ferricyanide 3d
Ferricyanide is the name for the anion [Fe(CN)6]3-. Its systematic name
Systematic name

There are millions of possible objects that can be described in science, too many to create common names for every one. As a response, a number of systems of systematic names have been created....
 is hexacyanoferrate(III) ion. The most common salt of this anion is potassium ferricyanide
Potassium ferricyanide

Potassium ferricyanide is the chemical compound with the formula K3[Fe6]. This bright red salt consists of the coordination compound ferricyanide....
, a red crystalline material that is used as an oxidant in organic chemistry
Organic chemistry

Organic chemistry is a discipline within chemistry which involves the science study of the structure, properties, composition, chemical reaction, and preparation of chemical compounds that contain carbon....
.

[Fe(CN)6]3- consists of an Fe3+ center bound in octahedral geometry to six cyanide
Cyanide

A cyanide is any chemical compound that contains the nitrile , which consists of a carbon atom chemical bond to a nitrogen atom. Inorganic cyanides are hydrogen cyanide salts in which cyanide is generally the anion CN-....
 ligand
Ligand

In chemistry, a ligand is either an atom, ion, or molecule that bonds to a central metal, generally involving formal donation of one or more of its electrons....
s. The complex has Oh symmetry
Symmetry group

The symmetry group of an object is the group of all isometries under which it is invariant with Function composition as the operation. It is a subgroup of the isometry group of the space concerned....
. 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 couple is a standard in electrochemistry
Electrochemistry

Electrochemistry is a branch of chemistry that studies chemical reactions which take place in a solution at the interface of an electron Electrical conductor and an ionic conductor , and which involve electron transfer between the electrode and the electrolyte or species in solution....
.

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

Prussian blue is a very dark blue, colorfast, non-toxic pigment ? one of the first synthetic pigments ? which was discovered accidentally in Berlin in 1704....
, the color of blueprints.

See also

  • potassium ferricyanide
    Potassium ferricyanide

    Potassium ferricyanide is the chemical compound with the formula K3[Fe6]. This bright red salt consists of the coordination compound ferricyanide....
  • Ferrocyanide
    Ferrocyanide

    Ferrocyanide is the name of the anion Iron64-. In aqueous solutions, this coordination complex is relatively unreactive. It is usually available as the potassium salt potassium ferrocyanide, which has the formula K4Fe6....