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