Rhenium_hexafluoride

Rhenium hexafluoride

Rhenium hexafluoride

Chemical compound

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

Further reading
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