Ruthenium hexafluoride

Ruthenium hexafluoride, also ruthenium(VI) fluoride (RuF6), is a compound of ruthenium and fluorine and one of the seventeen known binary hexafluorides.

Ruthenium hexafluoride
Names
IUPAC name
ruthenium(VI) fluoride
Other names
ruthenium(6+) hexafluoride
Identifiers
3D model (JSmol)
  • InChI=1/6FH.2Ru/h6*1H;;/q;;;;;;+6/p-6
    Key: NHWBVRAPBLSUQQ-UHFFFAOYSA-H
  • F[Ru](F)(F)(F)(F)F
Properties
RuF6
Molar mass 215.07 g/mol
Appearance dark brown crystalline solid[1]
Density 3.54 g/cm3
Melting point 54 °C (129 °F; 327 K)[1]
Boiling point 200 °C (392 °F, 473.15 K) (decomposes)[2]
reacts
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis

Ruthenium hexafluoride is made by a direct reaction of ruthenium metal in a gas stream of fluorine and argon at 400–450 °C. The yields of this reaction are less than 10%.[3]

Ru + 3 F
2 → RuF
6

Description

Ruthenium hexafluoride is a dark brown crystalline solid that melts at 54 °C.[1] The solid structure measured at −140 °C is orthorhombic space group Pnma. Lattice parameters are a = 9.313 Å, b = 8.484 Å, and c = 4.910 Å. There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 3.68 g·cm−3.[3]

The RuF6 molecule itself (the form important for the liquid or gas phase) has octahedral molecular geometry, which has point group (Oh). The Ru–F bond length is 1.818 Å.[3]

References
  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. Haynes, William M (2014-06-04). CRC Handbook of Chemistry and Physics, 95th Edition. CRC Press. ISBN 9781482208689.
  3. 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.

Further reading
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