Osmium hexafluoride

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

Osmium hexafluoride

Unit cell of osmium hexafluoride.
Names
IUPAC name
osmium(VI) fluoride
Other names
osmium hexafluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.969
UNII
Properties
OsF6
Molar mass 304.22 g/mol
Appearance yellow crystalline solid[1]
Density 5.09g/mL[2]
Melting point 33.4 °C (92.1 °F; 306.5 K)[1]
Boiling point 47.5 °C (117.5 °F; 320.6 K)[1]
Structure
Pnma, No. 62
a = 938.7 pm, b = 854.3 pm, c = 494.4 pm[3]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis

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

Os + 3 F
2 → OsF
6

Description

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.[4]

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. Drews, T.; Supeł, J.; Hagenbach, A.; Seppelt, K. (2006). "Solid State Molecular Structures of Transition Metal Hexafluorides". Inorganic Chemistry. 45 (9): 3782–3788. doi:10.1021/ic052029f. PMID 16634614.
  3. Drews, Thomas; Supeł, Joanna; Hagenbach, Adelheid; Seppelt, Konrad (2006). "Solid State Molecular Structures of Transition Metal Hexafluorides". Inorganic Chemistry. 45 (9): 3782–3788. doi:10.1021/ic052029f. PMID 16634614.
  4. 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.

Further reading
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