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Osmium heptafluoride is a possible inorganic chemical compound of osmium metal and fluorine with the chemical formula OsF
₇. It was first reported in 1966 by the reaction of fluorine and osmium at 600 °C and 400 atm, but no purported synthesis could be reproduced in 2006, giving only osmium hexafluoride instead.

Physical properties

If it exists, osmium(VII) fluoride is supposedly a bluish-yellow hygroscopic substance, extremely unstable. 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

References

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. "Osmium heptafluoride". WebElements. 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.

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