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 Unit cell of osmium hexafluoride.
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| Names | |
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| IUPAC name
osmium(VI) fluoride
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| Other names
osmium hexafluoride
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.033.969 |
PubChem CID
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| UNII | |
CompTox Dashboard (EPA)
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| 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]
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Osmium hexafluoride, also osmium(VI) fluoride, (OsF6) is a compound of osmium and fluorine, and one of the seventeen known binary hexafluorides.
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
- ^ 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.
- ^ a b c 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.
- ^ 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.
- ^ 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
- Gmelins Handbuch der anorganischen Chemie, System Nr. 53, Osmium, Supplement Volume 1, pp. 111–114.
