Chromium hexafluoride

Chromium hexafluoride or chromium(VI) fluoride is a hypothetical chemical compound between chromium and fluorine with the chemical formula CrF₆. It was previously thought to be an unstable yellow solid decomposing at −100 °C,^[2] but this has been shown to be a misidentification of chromium pentafluoride, CrF₅.^[3]

Chromium hexafluoride

Names
IUPAC name Chromium hexafluoride Chromium(VI) fluoride
Other names Hexafluorochromium[1] Hexafluoridochromium[1]
Identifiers
CAS Number	13843-28-2
3D model (JSmol)	Interactive image
ChEBI	CHEBI:33044
ChemSpider	4574205
PubChem CID	5460740
CompTox Dashboard (EPA)	DTXSID201045352
InChI InChI=1S/Cr.6FH/h;6*1H/q+6;;;;;;/p-6 Key: ZLMUYRIFFZDBSE-UHFFFAOYSA-H
SMILES F[Cr](F)(F)(F)(F)F
Properties
Chemical formula	CrF6
Molar mass	165.9865 g·mol−1
Related compounds
Related compounds	Molybdenum hexafluoride Tungsten hexafluoride Chromium pentafluoride Chromium(IV) fluoride Chromium(III) fluoride Chromium(II) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Unsuccessful attempts at synthesis

CrF₆ used to be thought to be produced by exhaustive fluorination of chromium metal at 400 °C (752 °F) and 20 MPa of pressure, and immediate freezing out of the reaction chamber to prevent decomposition:

Cr + 3 F₂ → CrF₆

However, it has been shown that chromium pentafluoride (CrF₅) is formed instead:

2 Cr + 5 F₂ → 2 CrF₅

and that CrF₆ has yet to be synthesized.