Ferricyanide

Ferricyanide is the name for the anion [Fe(CN)6] 3−. Its systematic name is hexacyanoferrate(III) ion. The most common salt of this anion is potassium ferricyanide, a red crystalline material that is used as an oxidant in organic chemistry.

[Fe(CN)6] 3− consists of an 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 couple is a standard in electrochemistry.

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

ee also

*potassium ferricyanide
*Ferrocyanide


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  • Ferricyanide — Fer ri*cy a*nide (?; 104), n. [Ferri + cyanide.] (Chem.) One of a complex series of double cyanides of ferric iron and some other base. [1913 Webster] {Potassium ferricyanide} (Chem.), red prussiate of potash; a dark, red, crystalline salt,… …   The Collaborative International Dictionary of English

  • ferricyanide — [fer΄īsī′ə nīd΄, fer΄isī′ə nīd΄] n. a salt of ferricyanic acid containing the trivalent negative radical Fe(CN) 6, in which the iron is trivalent …   English World dictionary

  • ferricyanide — noun Etymology: International Scientific Vocabulary Date: 1845 1. the trivalent anion Fe(CN)63 2. a compound containing the ferricyanide anion; especially the red salt K3Fe(CN)6 used in making blue pigments …   New Collegiate Dictionary

  • ferricyanide — /fer uy suy euh nuyd , fer ee /, n. Chem. a salt of ferricyanic acid, as potassium ferricyanide, K3Fe(CN)6. [1865 70; FERRI + CYANIDE] * * * …   Universalium

  • ferricyanide — The anion Fe(CN)63 . * * * fer·ri·cy·a·nide .fer .ī sī ə .nīd, .fer i n 1) the trivalent anion Fe(CN)63 2) a compound containing the ferricyanide anion esp the red salt K3Fe(CN)6 used in making blue pigments …   Medical dictionary

  • ferricyanide — fer•ri•cy•a•nide [[t]ˌfɛr aɪˈsaɪ əˌnaɪd, ˌfɛr i [/t]] n. chem. a salt of ferricyanic acid, as potassium ferricyanide, K3Fe(CN)6 • Etymology: 1865–70 …   From formal English to slang

  • ferricyanide — noun a) any of various salts containing the trivalent anion Fe(CN); used in making blue pigments b) a complex ion in which a central ferric iron atom is surrounded by six cyanide ions …   Wiktionary

  • ferricyanide — fer·ri·cyanide …   English syllables

  • ferricyanide — noun salt of ferricyanic acid obtained by oxidation of a ferrocyanide • Hypernyms: ↑salt …   Useful english dictionary

  • Potassium ferricyanide — Ferricyanide Fer ri*cy a*nide (?; 104), n. [Ferri + cyanide.] (Chem.) One of a complex series of double cyanides of ferric iron and some other base. [1913 Webster] {Potassium ferricyanide} (Chem.), red prussiate of potash; a dark, red,… …   The Collaborative International Dictionary of English


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