Chromium hexafluoride
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3D model (JSmol)
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CompTox Dashboard (EPA)
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| Properties | |
| CrF6 | |
| Molar mass | 165.9865 g·mol−1 |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chromium hexafluoride or chromium(VI) fluoride is a hypothetical chemical compound between chromium and fluorine with the chemical formula Cr F 6. 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]
Unsuccessful attempts at synthesis
[edit ]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.
References
[edit ]- ^ a b https://pubchem.ncbi.nlm.nih.gov/compound/Chromium-hexafluoride
- ^ Hope, Eric G.; Levason, William.; Ogden, J. Steven (1991). "Is chromium hexafluoride octahedral? Experiment still suggests "yes!"". Inorganic Chemistry. 30 (26): 4873. doi:10.1021/ic00026a002.
- ^ Riedel, Sebastian; Kaupp, Martin (2009). "The highest oxidation states of the transition metal elements". Coordination Chemistry Reviews. 253 (5–6): 606–624. doi:10.1016/j.ccr.2008年07月01日4.
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