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Ferrocyanide is the name of the anion (HREF="http://www.kotoba.ne.jp/word/11/cyanide" TITLE="cyanide">CN)6 )4−. Salts of this coordination complex give yellow solutions. It is usually available as the salt potassium ferrocyanide, which has the formula K4Fe(CN)6. ()4− is a diamagnetic species, featuring low-spin iron(II) center in an octahedral ligand environment. Although many salts of cyanide are highly toxic, ferro- and ferricyanides are less toxic because they tend not to release free cyanide. It is of commercial interest as a precursor to the pigment Prussian blue. ==Reactions== Treatment of ferrocyanide with ferric-containing salts gives the intensely coloured pigment Prussian blue 〔 (sometimes called ferric ferrocyanide and ferrous ferricyanide). Ferrocyanide may undergo oxidation, resulting in ferricyanide: :()4− (unicode:⇌) ()3− + e− This conversion can be followed spectroscopically at 420 nm, since ferrocyanide has negligible absorption while ferricyanide has an extinction coefficient of 1040 M−1 cm−1.〔Appleby, C. A., and Morton, R. K., Lactic dehydrogenase and cytochrome b2 of baker's yeast: Purification and crystallization. Biochem. J., 71, 492-499 (1959).〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ferrocyanide」の詳細全文を読む スポンサード リンク
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