“Chromium hexafluoride”的意思、由来-开放百科全书

词条

Chromium hexafluoride

释义

Unsuccessful attempts at synthesis
References

Chromium hexafluoride or chromium(VI) fluoride (CrF₆) 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,^[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 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

1. ^{{cite journal|doi=10.1021/ic00026a002|title=Is chromium hexafluoride octahedral? Experiment still suggests "yes!"|year=1991|last1=Hope|first1=Eric G.|last2=Levason|first2=William.|last3=Ogden|first3=J. Steven|journal=Inorganic Chemistry|volume=30|issue=26|pages=4873}}
2. ^{{cite journal |last1=Riedel |first1=Sebastian |last2=Kaupp |first2=Martin |year=2009 |title=The highest oxidation states of the transition metal elements |journal=Coordination Chemistry Reviews |volume=253 |issue=5–6 |doi=10.1016/j.ccr.2008.07.014 |pages=606–624 |url=http://144.206.159.178/ft/243/588116/14862785.pdf }}{{dead link|date=August 2017 |bot=InternetArchiveBot |fix-attempted=yes }}

4 : Chromium(Ⅵ) compounds|Metal halides|Hexafluorides|Hypothetical chemical compounds

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