Osmium oxide pentafluoride
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| Names | |
|---|---|
| Other names
Osmium oxypentafluoride | |
| Identifiers | |
3D model (JSmol) |
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| Properties[1] | |
| OsOF5 | |
| Molar mass | 301.22 g·mol−1 |
| Appearance | emerald green solid |
| Melting point | 59.2 °C (138.6 °F; 332.3 K) |
| Boiling point | 100.6 °C (213.1 °F; 373.8 K) |
| Vapor pressure | 41.1 mmHg (304.8 K) |
| 917×10−6 cm3/mol (293.8 K) | |
| Structure[2] | |
| Orthorhombic | |
| Pnma | |
a = 9.540 Å, b = 8.669 Å, c = 5.019 Å | |
Lattice volume (V) |
415.1 Å3 |
Formula units (Z) |
4 units per cell |
| Thermochemistry[1] | |
Enthalpy of fusion (ΔfH⦵fus) |
1.62 kcal/mol |
Enthalpy of vaporization (ΔfHvap) |
8.75 kcal/mol |
Enthalpy of sublimation (ΔfHsublim) |
10.37 kcal/mol |
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 oxide pentafluoride is an inorganic compound with the chemical formula OsOF5. It is a paramagnetic[3] emerald green solid, notable for being a heptavalent osmium compound stable in molecular form under normal temperature and pressure.[1]
It is dimorphic, forming orthorhombic crystals and transitioning to a cubic disordered phase at 32.5 °C.[2] OsOF5, in its high temperature form, is indistinguishable crystallographically from OsF6.[2]