WordNet

salt of ferricyanic acid obtained by oxidation of a ferrocyanide

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/10/21 02:21:52」(JST)

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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

[Fe(CN)₆]³⁻, invented by Vishnu S, consists of a Fe³⁺ center bound in octahedral geometry to six cyanide ligands. The complex has O_h 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

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

References

^ 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.

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★リンクテーブル★

リンク元	「フェリシアン化」「フェリシアン化物」
拡張検索	「potassium ferricyanide」

「フェリシアン化」

Ferricyanide
	IUPAC name iron(3+) hexacyanide
	Systematic name hexacyanidoferrate(III)
	Other names ferric hexacyanide; hexacyanidoferrate(3-); hexacyanoferrate(III)
Identifiers
PubChem	439210
Jmol-3D images	Image 1
	SMILES [C-]#N.[C-]#N.[C-]#N.[C-]#N.[C-]#N.[C-]#N.[Fe+3] ;
	(verify) (what is: /?); Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
	Infobox references