Chemistry:Potassium hexacyanochromate(III)

From HandWiki
Potassium hexacyanochromate(III)
Potassium hexacyanochromate(III), recrystallised from cold water.
The crystals of potassium hexacyanochromate(III) after three recrystallisations
IUPAC name
Potassium hexacyanochromate(III)
3D model (JSmol)
EC Number
  • 237-079-8
MeSH Hexacyanochromate
Molar mass 325.399 g·mol−1
Appearance Vivid, yellow, opaque crystals
Density 1.71 g/cm3
30.96 g/l00 mL (20° C)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Potassium hexacyanochromate(III) is an inorganic compound with the formula K3[Cr(CN)6]. It consists of three potassium cations and [Cr(CN)6]3− anion. It is a yellow, air-stable, paramagnetic solid. It is isomorphous with potassium ferricyanide.

Synthesis and reactions

The salt is prepared by treating chromium(III) salts with KCN.[1][2][3]

Reduction of hexacyanochromate(III) gives the Cr(II) and Cr(0) derivatives, [Cr(CN)6]4- and [Cr(CN)6]6-, respectively.[4]


  1. F. Hein, S. Herzog. G. Brauer. ed. Handbook of Preparative Inorganic Chemistry. 2 (2 ed.). p. 1373. 
  2. Cruser, Frederick Van Dyke; Miller, Edmund H. (1906). "The insoluble Chromicyanides". J. Am. Chem. Soc. 28 (9): 1132–51. doi:10.1021/ja01975a003. 
  3. Marvaud, Valérie; Mallah, Talal; Verdaguer, Michel (2004). Potassium Hexacyanochromate(III) and Its 13C-Enriched Analog. Inorganic Syntheses. 34. p. 144. doi:10.1002/0471653683.ch4. 
  4. Eaton, Janice P.; Nicholls, David (1981). "The Complex Cyanides of Chromium(II) and Chromium(0)". Transition Metal Chemistry 6 (4): 203–206. doi:10.1007/BF00618223.