Osmium hexafluoride

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Osmium hexafluoride
CAS number 13768-38-2
PubChem 123327
Jmol-3D images Image 1
Molecular formula OsF6
Molar mass 304.22 g/mol
Appearance yellow crystalline solid[1]
Density 5.09g/mL[2]
Melting point 33.4 °C[1]
Boiling point 47.5 °C[1]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Osmium hexafluoride, also osmium(VI) fluoride, (OsF6) is a compound of osmium and fluorine and one of the seventeen known binary hexafluorides.


Osmium hexafluoride is made by a direct reaction of osmium metal in an excess of elemental fluorine gas at 300 °C.

Os + 3 F


Osmium hexafluoride is a yellow crystalline solid that melts at 33.4 °C and boils at 47.5 °C.[1] The solid structure measured at −140 °C is orthorhombic space group Pnma. Lattice parameters are a = 9.387 Å, b = 8.543 Å, and c = 4.944 Å. There are four formula units (in this case, discrete molecules) per unit cell, giving a density of 5.09 g·cm−3.[2]

The OsF6 molecule itself (the form important for the liquid or gas phase) has octahedral molecular geometry, which has point group (Oh). The Os–F bond length is 1.827 Å.[2]

Partial hydrolysis of OsF6 produces OsOF4.[3]


This article incorporates information from the German Wikipedia.
  1. ^ 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.
  2. ^ a b c 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. ^ Paine, R. T. (1 June 1973). "Partial hydrolysis of rhenium and osmium hexafluorides. An improved synthesis and characterization of rhenium oxide tetrafluoride". Inorganic Chemistry 12 (6): 1457–1458. doi:10.1021/ic50124a060. 

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