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.
Binary hexafluorides
Known binary hexafluorides | Chalcogen binary hexafluorides | |
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Noble gas binary hexafluorides | |
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Transition metal binary hexafluorides | - MoF6
- TcF6
- RuF6
- RhF6
- WF6
- ReF6
- OsF6
- IrF6
- PtF6
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Actinide binary hexafluorides | |
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Predicted binary hexafluorides | Noble gas binary hexafluorides | |
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Transition metal binary hexafluorides | |
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Actinide binary hexafluorides | |
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Chromium compounds |
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Chromium(0) | Organochromium(0) compounds | Cr(C6H6)2 CrC6H6(CO)3 |
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Chromium(I) | Organochromium(I) compounds | |
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Chromium(II) | - CrH2
- Cr3C2
- Cr(C2O4)
- Cr(CH3CO2)2
- CrSi2
- CrO
- CrS
- CrSO4
- CrSe
- CrF2
- CrCl2
- CrBr2
- CrI2
Organochromium(II) compounds | |
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Chromium(II, III) | |
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Chromium(III) | - CrB
- [Cr3O(CH3CO2)6(H2O)3]+[CH3CO2]−
- CrN
- Cr(NO3)3
- CrPO4
- Cr2O3
- Cr(OH)3
- Cr2S3
- Cr2(SO4)3
- Cr2Te3
- CrF3
- CrCl3
- Cr(ClO4)3
- CrBr3
- CrI3
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Chromium(IV) | - CrSi
- CrO2
- CrF4
- CrCl4
- CrBr4
- CrI4
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Chromium(V) | |
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Chromium(VI) | - CrO3
- CrO(O2)2
- H2CrO4/H2Cr2O7
- CrO2F2
- CrOF4
- CrO2Cl2
- CrO2Br2
- [C5H5NH]+CrO3Cl−
- CrF6 (hypothetical)
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Polyatomic ion | |
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Fluorine compounds |
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Salts and covalent derivatives of the fluoride ion |
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HF | | | | ?HeF2 | LiF | BeF2 | BF BF3 B2F4 +BO3 | CF4 CxFy +CO3 | NF3 FN3 N2F2 NF N2F4 NF2 ?NF5 | OF2 O2F2 OF O3F2 O4F2 ?OF4 | F2 | Ne | NaF | MgF2 | AlF AlF3 | SiF4 | P2F4 PF3 PF5 | S2F2 SF2 S2F4 SF3 SF4 S2F10 SF6 +SO4 | ClF ClF3 ClF5 | ?ArF2 ?ArF4 | KF | CaF CaF2 | | ScF3 | TiF2 TiF3 TiF4 | VF2 VF3 VF4 VF5 | CrF2 CrF3 CrF4 CrF5 ?CrF6 | MnF2 MnF3 MnF4 ?MnF5 | FeF2 FeF3 FeF4 | CoF2 CoF3 CoF4 | NiF2 NiF3 NiF4 | CuF CuF2 ?CuF3 | ZnF2 | GaF2 GaF3 | GeF2 GeF4 | AsF3 AsF5 | Se2F2 SeF4 SeF6 +SeO3 | BrF BrF3 BrF5 | KrF2 ?KrF4 ?KrF6 | RbF | SrF SrF2 | | YF3 | ZrF2 ZrF3 ZrF4 | NbF4 NbF5 | MoF4 MoF5 MoF6 | TcF4 TcF 5 TcF6 | RuF3 RuF 4 RuF5 RuF6 | RhF3 RhF4 RhF5 RhF6 | PdF2 Pd[PdF6] PdF4 ?PdF6 | Ag2F AgF AgF2 AgF3 | CdF2 | InF InF3 | SnF2 SnF4 | SbF3 SbF5 | TeF4 ?Te2F10 TeF6 +TeO3 | IF IF3 IF5 IF7 +IO3 | XeF2 XeF4 XeF6 ?XeF8 | CsF | BaF2 | | LuF3 | HfF4 | TaF5 | WF4 WF5 WF6 | ReF4 ReF5 ReF6 ReF7 | OsF4 OsF5 OsF6 ?OsF 7 ?OsF 8 | IrF2 IrF3 IrF4 IrF5 IrF6 | PtF2 Pt[PtF6] PtF4 PtF5 PtF6 | AuF AuF3 Au2F10 ?AuF6 AuF5•F2 | Hg2F2 HgF2 ?HgF4 | TlF TlF3 | PbF2 PbF4 | BiF3 BiF5 | ?PoF2 PoF4 PoF6 | AtF ?AtF3 ?AtF5 | RnF2 ?RnF 4 ?RnF 6 | FrF | RaF2 | | LrF3 | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | | ↓ | | | | LaF3 | CeF3 CeF4 | PrF3 PrF4 | NdF2 NdF3 NdF4 | PmF3 | SmF2 SmF3 | EuF2 EuF3 | GdF3 | TbF3 TbF4 | DyF2 DyF3 DyF4 | HoF3 | ErF3 | TmF2 TmF3 | YbF2 YbF3 | AcF3 | ThF3 ThF4 | PaF4 PaF5 | UF3 UF4 UF5 UF6 | NpF3 NpF4 NpF5 NpF6 | PuF3 PuF4 PuF5 PuF6 | AmF2 AmF3 AmF4 ?AmF6 | CmF3 CmF4 ?CmF6 | BkF3 BkF 4 | CfF3 CfF4 | EsF3 EsF4 ?EsF6 | Fm | Md | No | |
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PF6−, AsF6−, SbF6− compounds | - AgPF6
- KAsF6
- LiAsF6
- NaAsF6
- HPF6
- HSbF6
- NH4PF6
- LiSbF6
- KPF6
- KSbF6
- LiPF6
- NaPF6
- NaSbF6
- TlPF6
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AlF6− compounds | - (NH4)3[AlF6]
- Cs2AlF5
- Li3AlF6
- K3AlF6
- Na3AlF6
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chlorides, bromides, iodides and pseudohalogenides | |
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SiF62-, GeF62- compounds | - BaSiF6
- BaGeF6
- (NH4)2SiF6
- Na2[SiF6]
- K2[SiF6]
- Li2GeF6
- Li2SiF6
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Oxyfluorides | - BrOF3
- BrO2F
- BrO3F
- LaOF
- ThOF2
- VOF
3 - TcO
3F - WOF
4 - YOF
- ClOF3
- ClO2F3
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Organofluorides | - CBrF3
- CBr2F2
- CBr3F
- CClF3
- CCl2F2
- CCl3F
- CF2O
- CF3I
- CHF3
- CH2F2
- CH3F
- C2Cl3F3
- C2H3F
- C6H5F
- C7H5F3
- C15F33N
- C3H5F
- C6H11F
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with transition metal, lanthanide, actinide, ammonium | - VOF3
- CrOF4
- CrF2O2
- NH4F
- (NH4)3CrF6
- (NH4)3GaF6
- (NH4)2GeF6
- (NH4)3FeF6
- (NH4)3InF6
- NH4NbF6
- (NH4)2SnF6
- NH4TaF6
- (NH4)3VF6
- (NH4)2ZrF6
- CsXeF7
- Li2SnF6
- Li2TiF6
- LiWF6
- Li2ZrF6
- K2TiF6
- Rb2TiF6
- Na2TiF6
- Na2ZrF6
- K2NbF7
- K2TaF7
- K2ZrF6
- UO2F2
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nitric acids | |
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bifluorides | |
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thionyl, phosphoryl, and iodosyl | - F2OS
- F3OP
- PSF3
- IOF3
- IO3F
- IOF5
- IO2F
- IO2F3
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