Potassium hexacyanochromate(III)

Potassium hexacyanochromate(III)
Names
	IUPAC name Potassium hexacyanochromate(III)
Identifiers
CAS Number	13601-11-1;
3D model (JSmol)	Interactive image;
ChemSpider	19988791 ;
ECHA InfoCard	100.033.694
EC Number	237-079-8;
MeSH	Hexacyanochromate
PubChem CID	21123765;
CompTox Dashboard (EPA)	DTXSID10929218 ;
	InChI InChI=1S/6CN.Cr.3K/c61-2;;;;/q;;;;;;-3;3+1 Key: VOCDJOPDZZSPRQ-UHFFFAOYSA-N ;
	SMILES [K+].[K+].[K+].N#C[Cr-3](C#N)(C#N)(C#N)(C#N)C#N;
Properties
Chemical formula	C6CrK3N6
Molar mass	325.399 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

^ Cruser, Frederick Van Dyke; Miller, Edmund H. (1906). "The insoluble Chromicyanides". J. Am. Chem. Soc. 28 (9): 1132–51. doi:10.1021/ja01975a003.
^ 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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[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.

[1]

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