Chromium hexafluoride
Chromium hexafluoride or chromium(VI) fluoride (CrF6) is a hypothetical chemical compound with the chemical formula CrF6. It was previously thought to be an unstable yellow solid decomposing at -100 °C,[1] but this has been shown to be a misidentification of chromium pentafluoride, CrF5.[2]
Unsuccessful attempts at synthesis
CrF6 used to be thought to be produced by exhaustive fluorination of chromium metal at 400 °C and 20 million pascals 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
- ↑ 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" (PDF). Coordination Chemistry Reviews 253 (5–6): 606–624. doi:10.1016/j.ccr.2008.07.014.
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