Osmium hexafluoride
Chemical compound
From Wikipedia, the free encyclopedia
Osmium hexafluoride, also osmium(VI) fluoride, (OsF6) is a compound of osmium and fluorine, and one of the seventeen known binary hexafluorides.
-fluoride.svg)
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-fluorid.png) Unit cell of osmium hexafluoride. | |
| Names | |
|---|---|
| IUPAC name
osmium(VI) fluoride | |
| Other names
osmium hexafluoride | |
| 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 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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]