Bis(pentafluorophenyl)xenon
Chemical compound
From Wikipedia, the free encyclopedia
Bis(pentafluorophenyl)xenon is an unstable organic compound of xenon.[1][2] It consists of two fluorinated phenyl rings connected to xenon.
xenon_conformation.png)
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| Names | |||
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| IUPAC name
Bis(2,3,4,5,6-pentafluorophenyl)xenon | |||
| Identifiers | |||
3D model (JSmol) |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |||
| C12F10Xe | |||
| Molar mass | 465.409 g·mol−1 | ||
| Density | 2.447 g/cm3 (at 50 K) | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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xenon-3D-balls.png)
xenon-3D-vdW.png)
Structure
Bis(pentafluorophenyl)xenon is a molecular substance. In the solid form it crystallises in the monoclinic system with space group P21/n.[3] The unit cell has four molecules with a = 13.635 Å. b = 8.248 Å. c = 11.511 Å, β = 102.624°. The unit cell volume is 1263.18 Å3.[4]
The molecules have carbon to xenon to carbon bonds in nearly a straight line (the bond angle is at least 175°). The carbon–xenon bond lengths are 2.35 and 2.39 Å. The two pentafluorophenyl rings are twisted by 72° with respect to each other.[3]
Properties
Bis(pentafluorophenyl)xenon decomposes above −20 °C and can explode.[1]
Preparation
Xe(C6F5)2 is prepared from the [(CH3)4N]F catalyzed reactions of (CH3)3SiC6F5 and XeF2 in propionitrile, propionitrile/acetonitrile, acetonitrile, or CH2Cl2 , at −60 to −40 °C as the first [10-Xe-2] species with two xenon-carbon bonds as a colorless solid that decomposes above −20 °C and spontaneously at 20 °C.[1] C6F5XeF[1][2] is formed as an intermediate which has been characterized by NMR spectroscopy.
- XeF2 + (CH3)3SiC6F5 → C6F5XeF + (CH3)3SiF
- XeF2 + 2 (CH3)3SiC6F5 → Xe(C6F5)2 + 2 (CH3)3SiF
Xe(C6F5)2 is also formed from the reaction of C6F5XeF with Cd(C6F5)2[2]
- 2 C6F5XeF + Cd(C6F5)2 → Xe(C6F5)2 + CdF2
However, the direct introduction of the C6F5 group into XeF2 with Cd(C6F5)2 is not successful.[2]
Bis(pentafluorophenyl)xenon is crystallized from dichloromethane at −40 °C.[3]
Reactions
Bis(pentafluorophenyl)xenon reacts with mercury to make bis(pentafluorophenyl)mercury.[1]
Bis(pentafluorophenyl)xenon reacts with hydrogen fluoride to form pentafluorophenyl xenon fluoride C6F5XeF.[2] In acetonitrile solution bis(pentafluorophenyl)xenon decomposes to form C6F5-C6F5 (C12F10) and xenon.[5] But in dichloromethane solution the product is mostly pentafluorobenzene.[5]
It reacts with iodine to make pentafluoroiodobenzene (C6F5I).[2]