Chromium hexafluoride

{{short description|Hypothetical chemical compound}}

{{Chembox

| ImageFile = Chromium hexafluoride molecule.png

| ImageAlt = Chromium hexafluoride molecule

| IUPACName = {{ubl|Chromium hexafluoride|Chromium(VI) fluoride}}

| OtherNames = {{ubl|Hexafluorochromiumhttps://pubchem.ncbi.nlm.nih.gov/compound/Chromium-hexafluoride|Hexafluoridochromium}}

| Section1 = {{Chembox Identifiers

| CASNo = 13843-28-2

| PubChem = 5460740

| ChemSpiderID = 4574205

| ChEBI = 33044

| InChI = 1S/Cr.6FH/h;6*1H/q+6;;;;;;/p-6

| InChIKey = ZLMUYRIFFZDBSE-UHFFFAOYSA-H

| SMILES = F[Cr](F)(F)(F)(F)F

}}

| Section2 = {{Chembox Properties

| Cr=1|F=6

| Appearance =

| Density =

| MeltingPt =

| BoilingPt =

| Solubility =

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| Section7 = {{Chembox Hazards

| MainHazards =

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| Section9 = {{Chembox Related

| OtherCompounds = {{ubl|Molybdenum hexafluoride|Tungsten hexafluoride|Chromium pentafluoride|Chromium(IV) fluoride|Chromium(III) fluoride|Chromium(II) fluoride}}

}}

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Chromium hexafluoride or chromium(VI) fluoride is a hypothetical chemical compound between chromium and fluorine with the chemical formula {{chem2|CrF6|auto=6}}. It was previously thought to be an unstable yellow solid decomposing at −100 °C,{{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}} but this has been shown to be a misidentification of chromium pentafluoride, CrF5.{{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}}

Unsuccessful attempts at synthesis

{{chem2|CrF6}} used to be thought to be produced by exhaustive fluorination of chromium metal at {{cvt|400|C|F}} and 20 MPa of pressure, and immediate freezing out of the reaction chamber to prevent decomposition:

:{{chem2|Cr + 3 F2 → CrF6}}

However, it has been shown that chromium pentafluoride ({{chem2|CrF5}}) is formed instead:

:{{chem2|2 Cr + 5 F2 → 2 CrF5}}

and that {{chem2|CrF6}} has yet to be synthesized.

References

{{reflist}}

Category:Chromium(VI) compounds

Category:Chromium–halogen compounds

Category:Metal halides

Category:Hexafluorides

Category:Hypothetical chemical compounds

{{Hexafluorides}}

{{Chromium compounds}}

{{fluorine compounds}}

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{{inorganic-compound-stub}}