Rhenium hexafluoride
Rhenium hexafluoride, also rhenium(VI) fluoride, (ReF6) is a compound of rhenium and fluorine and one of the seventeen known binary hexafluorides.
| Names | |
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| IUPAC name rhenium(VI) fluoride | |
| Other names rhenium hexafluoride | |
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| ECHA InfoCard | 100.030.144 |
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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). | |
Chemistry edit
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 edit
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 edit
Rhenium hexafluoride is a commercial material used in the electronics industry for depositing films of rhenium.[3]
References edit
- ^ a b c d CRC Handbook of Chemistry and Physics, 90th Edition, CRC Press, Boca Raton, Florida, 2009, ISBN 978-1-4200-9084-0, Section 4, Physical Constants of Inorganic Compounds, p. 4-85.
- ^ a b c d T. Drews, J. Supeł, A. Hagenbach, K. Seppelt: "Solid State Molecular Structures of Transition Metal Hexafluorides", in: Inorganic Chemistry, 2006, 45 (9), S. 3782–3788; doi:10.1021/ic052029f; PMID 16634614.
- ^ a b Meshri, D. T. (2000). "Fluorine Compounds, Inorganic, Rhenium". Kirk-Othmer Encyclopedia of Chemical Technology. doi:10.1002/0471238961.1808051413051908.a01. ISBN 0471238961.
Further reading edit
- Gmelins Handbuch der anorganischen Chemie, System Nr. 70, Rhenium, Part A, pp. 102–105.
External links edit
- Rhenium hexafluoride at webelements.com.