Osmium heptafluoride

Osmium heptafluoride is a possible inorganic chemical compound of osmium metal and fluorine with the chemical formula OsF
₇.^[2][3] It was first reported in 1966 by the reaction of fluorine and osmium at 600 °C and 400 atm,^[4] but no purported synthesis could be reproduced in 2006, giving only osmium hexafluoride instead.^[5]

Osmium heptafluoride

Names
Other names Osmium(VII) fluoride
Identifiers
CAS Number	16949-69-2
3D model (JSmol)	Interactive image
InChI InChI=1S/7FH.Os/h7*1H;/q;;;;;;;+7/p-7 Key: PYLQBEQBIUJFFB-UHFFFAOYSA-G
SMILES F[Os](F)(F)(F)(F)(F)F
Properties
Chemical formula	F7Os
Molar mass	323.22 g·mol−1
Structure
Crystal structure	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). Infobox references

Physical properties

If it exists, osmium(VII) fluoride is supposedly 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