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Chromium hexafluoride

Hypothetical chemical compound From Wikipedia, the free encyclopedia

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]

Quick facts Names, Identifiers ...
Chromium hexafluoride
Chromium hexafluoride molecule
Names
IUPAC name
  • Chromium hexafluoride
  • Chromium(VI) fluoride
Other names
  • Hexafluorochromium[1]
  • Hexafluoridochromium[1]
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
  • InChI=1S/Cr.6FH/h;6*1H/q+6;;;;;;/p-6
    Key: ZLMUYRIFFZDBSE-UHFFFAOYSA-H
  • F[Cr](F)(F)(F)(F)F
Properties
CrF6
Molar mass 165.9865 g·mol−1
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.

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