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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 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.
↑ 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.

[Holloway-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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