Rhenium hexafluoride
Chemical compound
From Wikipedia, the free encyclopedia
Rhenium hexafluoride, also rhenium(VI) fluoride, (ReF6) is a compound of rhenium and fluorine and one of the seventeen known binary hexafluorides.
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| Names | |
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| IUPAC name
rhenium(VI) fluoride | |
| Other names
rhenium hexafluoride | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.030.144 |
| EC Number |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| F6Re | |
| Molar mass | 300.20 g/mol |
| Appearance | liquid, or yellow crystalline solid[1] |
| Density | 4.94g/mL[2] |
| Melting point | 18.5 °C (65.3 °F; 291.6 K)[1] |
| Boiling point | 33.7 °C (92.7 °F; 306.8 K)[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemistry
Rhenium hexafluoride is made by combining rhenium heptafluoride with additional rhenium metal at 300 °C in a pressure vessel.[2]
- 6 ReF
7 + Re → 7 ReF
6
The compound is a Lewis acid and strong oxidant, adducting potassium fluoride and oxidizing nitric oxide to nitrosyl:[3]
- 2KF + ReF6 → K2ReF8
- NO + ReF6 → [NO][ReF6]
Description
Rhenium hexafluoride is a liquid at room temperature. At 18.5 °C, it freezes into a yellow solid. The boiling point is 33.7 °C.[1]
The solid structure measured at −140 °C is orthorhombic space group Pnma. Lattice parameters are a = 9.417 Å, b = 8.570 Å, and c = 4.965 Å. There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 4.94 g·cm−3.[2]
The ReF6 molecule itself (the form important for the liquid or gas phase) has octahedral molecular geometry, which has point group (Oh). The Re–F bond length is 1.823 Å.[2]
Use
Rhenium hexafluoride is a commercial material used in the electronics industry for depositing films of rhenium.[3]