Iridium hexafluoride

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Iridium hexafluoride
IUPAC name

iridium(VI) fluoride

Other names

iridium hexafluoride

Identifiers
CAS number 7783-75-7 N
PubChem 3014587
ChemSpider 20082378 N
Jmol-3D images {{#if:F[Ir](F)(F)(F)(F)F|Image 1
Properties
Molecular formula IrF6
Molar mass 306.22 g/mol
Appearance yellow crystalline solid[1]
Density 5.11g/mL[2]
Melting point 44 °C[1]
Boiling point 53.6 °C[1]
Solubility soluble in HF
Related compounds
Other cations rhodium hexafluoride
osmium hexafluoride
platinum hexafluoride
Related compounds iridium(V) fluoride
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Iridium hexafluoride, also iridium(VI) fluoride, (IrF6) is a compound of iridium and fluorine and one of the seventeen known binary hexafluorides. It is one of only a few compounds with iridium in its highest oxidation state, +6.

Synthesis

Iridium hexafluoride is made by a direct reaction of iridium metal in an excess of elemental fluorine gas at 300 °C. However, it is thermally unstable and must be frozen out of the gaseous reaction mixture to avoid dissociation.

Ir + 3 F
2 → IrF
6

Description

Iridium hexafluoride is a yellow crystalline solid that melts at 44 °C and boils at 53.6 °C.[1] The solid structure measured at −140 °C is orthorhombic space group Pnma. Lattice parameters are a = 9.411 Å, b = 8.547 Å, and c = 4.952 Å. There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 5.11 g·cm−3.[2]

The IrF6 molecule itself (the form important for the liquid or gas phase) has octahedral molecular geometry, which has point group (Oh). The Ir–F bond length is 1.833 Å.[2]

References

This article incorporates information from the German Wikipedia.
  1. ↑ 1.0 1.1 1.2 1.3 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. ↑ 2.0 2.1 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.

Further reading

  • Gmelins Handbuch der anorganischen Chemie, System Nr. 67, Iridium, Supplement Volume 2, pp. 99–102.

External links

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