Osmium pentafluoride

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Osmium pentafluoride
PtF5solid.tif
Unit cell of OsF5.png
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/5FH.Os/h5*1H;/q;;;;;+5/p-5
    Key: RFWLPKSDISVSGM-UHFFFAOYSA-I
  • monomer:F[Os](F)(F)(F)F
  • tetramer:F[Os-]1(F)(F)(F)[F+][Os-](F)(F)(F)(F)[F+][Os-](F)(F)(F)(F)[F+][Os-](F)(F)(F)(F)[F+]1
Properties
F5Os
Molar mass 285.22 g·mol−1
Appearanceblue-green solid
Melting point 70 °C (158 °F; 343 K)
Structure [1]
Monoclinic
P21/c (No. 14)
a = 5.53 Å, b = 9.91 Å, c = 12.59 Å
α = 90°, β = 99.5°, γ = 90°
680 Å3
8 units per cell
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Osmium pentafluoride is an inorganic compound with the formula OsF5. It is a blue-green solid. Like the pentafluorides of Ru, Rh, and Ir, OsF5 exists as a tetramer in the solid state.

Preparation

Osmium pentafluoride can be prepared by reduction of osmium hexafluoride with iodine as a solution in iodine pentafluoride: [1]

10 OsF6 + I2 → 10 OsF5 + 2 IF5

It can also be prepared by treating a solution of osmium hexafluoride in anhydrous hydrogen fluoride with hydrogen or silicon. [2] Platinum gauze or UV irradiation increase the reaction rate.

References

  1. 1 2 Holloway, John H.; Mitchell, S. J. (1971). "Preparation and Crystal Structure of Osmium Pentafluoride". Journal of the Chemical Society: 2789–94. doi:10.1039/J19710002789.
  2. ↑ Paine, Robert T.; Asprey, Larned B. (1975-05-01). "Reductive syntheses of transition metal fluoride compounds. Synthesis of rhenium, osmium, and iridium pentafluorides and tetrafluorides". Inorganic Chemistry. 14 (5): 1111–1113. doi:10.1021/ic50147a030. ISSN   0020-1669.
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