Potassium hexacyanochromate(III)

Potassium hexacyanochromate(III)
Potassium hexacyanochromate(III), recrystallised from cold water.
The crystals of potassium hexacyanochromate(III) after three recrystallisations
Names
IUPAC name
Potassium hexacyanochromate(III)
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.694
EC Number 237-079-8
MeSH Hexacyanochromate
Properties
C6CrK3N6
Molar mass 325.40 g·mol−1
Appearance Vivid, yellow, opaque crystals
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 a coordination compound with the formula K3[Cr(CN)6]. It consists of three potassium cations and a central hexacyanometallate with [Cr(CN)6]3− anion. It is a yellow, air-stable, paramagnetic solid. It is not stable at higher temperatures, forming chromium(III) hydroxide precipitate.

The salt is prepared by treating chromium trioxide, dissolved in concentrated hydrochloric acid, with ethanol in a redox reaction. Following the solution is evaporated to dryness. The residue is dissolved in a boiling solution of KCN. The evaporation is repeated, but not till dryness. The concentrated solution is left in the cold to sulphur.[1]

The Cr(II) derivative is unusual and has been little studied.[2]

References

  1. ↑ Cruser, Frederick Van Dyke; Miller, Edmund H. (1906). "The insoluble Chromicyanides". J. Am. Chem. Soc. 28 (9): 1132–51. doi:10.1021/ja01975a003.
  2. ↑ Deeth, R.J. (2006). "A Theoretical Rationale for the Formation, Structure and Spin State of Pentacyanochromate(II)". European Journal of Inorganic Chemistry. 2006 (13): 2551–2555. doi:10.1002/ejic.200600137.


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