Ferricyanide

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Ferricyanide
HexacyanidoferratIII 2.svg
Ferricyanide-3D.png
Names
IUPAC name
iron(3+) hexacyanide
Systematic IUPAC name
hexacyanidoferrate(III)
Other names
ferric hexacyanide; hexacyanidoferrate(3-); hexacyanoferrate(III)
Identifiers
3D model (JSmol)
Properties
[Fe(CN)6]3−
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Ferricyanide is 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.[1]

Properties[edit]

[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 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.

Uses[edit]

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

References[edit]

  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. doi:10.1002/14356007.a08_159.pub3. 

See also[edit]

Salts and covalent derivatives of the cyanide ion
HCN He
LiCN Be(CN)2 B C NH4CN OCN,
-NCO
FCN Ne
NaCN Mg(CN)2 Al(CN)3 SiCN P(CN)3 SCN,
-NCS,
(SCN)2,
S(CN)2
ClCN Ar
KCN Ca(CN)2 Sc(CN)3 Ti(CN)4 VO(CN)3 Cr(CN)3 Mn(CN)2 Fe(CN)3,
Fe(CN)64−,
Fe(CN)63−
Co(CN)2,
Co(CN)3
Ni(CN)2
Ni(CN)42−
CuCN Zn(CN)2 Ga(CN)3 Ge As(CN)3 SeCN
(SeCN)2
Se(CN)2
BrCN Kr
RbCN Sr(CN)2 Y(CN)3 Zr(CN)4 Nb Mo Tc Ru Rh Pd(CN)2 AgCN Cd(CN)2 In(CN)3 Sn Sb Te(CN)2,
Te(CN)4
ICN XeCN
CsCN Ba(CN)2   Hf Ta W Re Os Ir Pt Au Hg2(CN)2,
Hg(CN)2
TlCN Pb(CN)2 Bi(CN)3 Po At Rn
Fr Ra   Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
La Ce(CN)3,
Ce(CN)4
Pr Nd Pm Sm Eu Gd(CN)3 Tb Dy Ho Er Tm Yb Lu
Ac Th Pa UO2(CN)2 Np Pu Am Cm Bk Cf Es Fm Md No Lr