Chromium hexafluoride

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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

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.2008.07.014.

Fluorine compounds
HF He LiF BeF2 BF BF3 B2F4 CF4 CxFy NF3 N2F4 OF OF2 O2F2 O2F F− Ne NaF MgF2 AlF AlF3 SiF4 P2F4 PF3 PF5 S2F2 SF2 S2F4 SF4 S2F10 SF6 ClF ClF3 ClF5 HArF ArF2 KF CaF2 ScF3 TiF3 TiF4 VF2 VF3 VF4 VF5 CrF2 CrF3 CrF4 CrF5 CrF6 MnF2 MnF3 MnF4 FeF2 FeF3 CoF2 CoF3 NiF2 NiF3 CuF CuF2 ZnF2 GaF3 GeF4 AsF3 AsF5 SeF4 SeF6 BrF BrF3 BrF5 KrF2 KrF4 KrF6 RbF SrF2 YF3 ZrF4 NbF4 NbF5 MoF4 MoF5 MoF6 TcF6 RuF3 RuF4 RuF5 RuF6 RhF3 RhF5 RhF6 PdF2 Pd[PdF6] PdF4 PdF6 AgF AgF2 AgF3 Ag2F CdF2 InF3 SnF2 SnF4 SbF3 SbF5 TeF4 TeF6 IF IF3 IF5 IF7 XeF2 XeF4 XeF6 XeF8 CsF BaF2 * LuF3 HfF4 TaF5 WF4 WF6 ReF6 ReF7 OsF4 OsF5 OsF6 OsF 7 OsF8 IrF3 IrF5 IrF6 PtF2 Pt[PtF6] PtF4 PtF5 PtF6 AuF AuF3 Au2F10 AuF5·F2 HgF2 Hg2F2 HgF4 TlF TlF3 PbF2 PbF4 BiF3 BiF5 PoF4 PoF6 At RnF2 RnF6 Fr RaF2 ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og ↓ * LaF3 CeF3 CeF4 PrF3 PrF4 NdF3 PmF3 SmF2 SmF3 EuF2 EuF3 GdF3 TbF3 TbF4 DyF3 HoF3 ErF3 TmF2 TmF3 YbF2 YbF3 ** AcF3 ThF4 PaF4 PaF5 UF3 UF4 UF5 UF6 NpF3 NpF4 NpF5 NpF6 PuF3 PuF4 PuF5 PuF6 AmF3 AmF4 AmF6 CmF3 Bk Cf Es Fm Md No
PF6−, AsF6−, SbF6− compounds	AgPF6 KAsF6 LiAsF6 NaAsF6 HPF6 HSbF6 NH4PF6 KPF6 KSbF6 LiPF6 NaPF6 NaSbF6 TlPF6
AlF6− compounds	Cs2AlF5 K3AlF6 Na3AlF6
chlorides, bromides, iodides and pseudohalogenides	BaClF CFN ClFO2
SiF62-, GeF62- compounds	BaSiF6 BaGeF6 (NH4)2SiF6 Na2[SiF6] K2[SiF6]
Oxyfluorides	BrOF3 BrO2F BrO3F LaOF ThOF2 VOF 3 TcO 3F WOF 4 YOF ClOF3 ClO2F3
Organofluorides	CBrF3 CBr2F2 CBr3F CClF3 CCl2F2 CCl3F CF2O CF3I CHF3 CH2F2 CH3F C2Cl3F3 C2H3F C6H5F C7H5F3 C15F33N C3H5F C6H11F
with transition metal, lanthanide, actinide, ammonium	VOF3 CrOF4 CrF2O2 NH4F Na2TiF6 Na2ZrF6 K2NbF7 K2TaF7 UO2F2
nitric acids	FNO FNO2 FNO3
bifluorides	KHF2 NaHF2 NH4HF2
thionyl, phosphoryl, and iodosyl	F2OS F3OP PSF3 IOF3 IO3F IOF5 IO2F IO2F3
Chemical formulas

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