Osmium hexafluoride
| Osmium hexafluoride | |
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-fluoride.svg) |
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osmium(VI) fluoride |
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Other names
osmium hexafluoride |
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| Identifiers | |
| CAS number | 13768-60-0 |
| PubChem | 123327 |
| Jmol-3D images | Image 1 |
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| Properties | |
| 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, 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.
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Synthesis[edit]
Osmium hexafluoride is made by a direct reaction of osmium metal in an excess of elemental fluorine gas at 300 °C.
Description[edit]
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]
References[edit]
- This article incorporates information from the German Wikipedia.
- ^ 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 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.
- ^ 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[edit]
- Gmelins Handbuch der anorganischen Chemie, System Nr. 53, Osmium, Supplement Volume 1, pp. 111–114.
External links[edit]
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