Rhenium hexafluoride

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Rhenium hexafluoride
Rhenium(VI)-fluoride.svg
Names
IUPAC name
rhenium(VI) fluoride
Other names
rhenium hexafluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.144 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 233-172-2
PubChem CID
UNII
  • InChI=1S/6FH.Re/h6*1H;/q;;;;;;+6/p-6
  • F[Re](F)(F)(F)(F)F
Properties
F6Re
Molar mass 300.20 g/mol
Appearanceliquid, 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).

Rhenium hexafluoride, also rhenium(VI) fluoride, (ReF6) is a compound of rhenium and fluorine and one of the seventeen known binary hexafluorides.

Contents

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]

References

  1. 1 2 3 4 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.
  2. 1 2 3 4 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.
  3. 1 2 Meshri, D. T. (2000). "Fluorine Compounds, Inorganic, Rhenium". Kirk-Othmer Encyclopedia of Chemical Technology. Wiley. doi:10.1002/0471238961.1808051413051908.a01. ISBN   0471238961.

Further reading

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