Osmium heptafluoride
Other names
Osmium(VII) fluoride
3D model (JSmol)
  • InChI=1S/7FH.Os/h7*1H;/q;;;;;;;+7/p-7
  • F[Os](F)(F)(F)(F)(F)F
Molar mass 323.22 g·mol−1
Pentagonal bipiramidal (calculated)[1]
Related compounds
Related compounds
Rhenium heptafluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Osmium heptafluoride is an inorganic chemical compound of osmium metal and fluorine with the chemical formula OsF
.[2][3] It was first reported in 1966 by the reaction of fluorine and osmium at 600 °C and 400 atm,[4] but later experiments can’t reproduce this compound.[5]

Physical properties

Osmium(VII) fluoride forms a bluish-yellow hygroscopic substance, extremely unstable.[6] The compound starts decomposing at –100 °C. It should be stored in a nickel vessel at the temperature of liquid nitrogen.

Chemical properties

Osmium heptafluoride decomposes to osmium hexafluoride when slightly heated:

2OsF7  → 2OsF6 + F2


  1. ^ Bayerische Julius-Maximilians-Universität Würzburg (2006). The Highest Oxidation States of the 5d Transition Metals: a Quantum-Chemical Study (PDF) (Report). Chemical Society. Retrieved 2011-06-20.
  2. ^ "WebElements Periodic Table » Osmium » osmium heptafluoride". webelements.com. Retrieved 19 April 2023.
  3. ^ Hawkins, Donald T. (6 December 2012). Binary Fluorides: Free Molecular Structures and Force Fields A Bibliography (1957–1975). Springer Science & Business Media. p. 42. ISBN 978-1-4684-6147-3. Retrieved 19 April 2023.
  4. ^ Glemser, Oskar; Roesky, Herbert W.; Hellberg, Karl-Heinz; Werther, Heinz-Ulrich (1966). "Darstellung und Eigenschaften von Osmiumheptafluorid". Chemische Berichte. 99 (8). Wiley: 2652–2662. doi:10.1002/cber.19660990834. ISSN 0009-2940.
  5. ^ Shorafa, Hashem; Seppelt, Konrad (1 September 2006). "Osmium(VII) Fluorine Compounds". Inorganic Chemistry. 45 (19): 7929–7934. doi:10.1021/ic0608290. PMID 16961386.
  6. ^ Edwards, A. J. (1 November 1983). "Structures of the binary fluorides". Advances in Inorganic Chemistry. 27. Academic Press: 108. ISBN 9780080578767. Retrieved 19 April 2023.