Osmium heptafluoride is a possible inorganic chemical compound of osmium metal and fluorine with the chemical formula . It was first reported in 1966 by the reaction of fluorine and osmium at 600 ðC and 400 atm, but no purported synthesis could be reproduced in 2006, giving only osmium hexafluoride instead.
If it exists, osmium(VII) fluoride is supposedly a bluish-yellow hygroscopic substance, extremely unstable. The compound starts decomposing at âÂÂ100 ðC. It should be stored in a nickel vessel at the temperature of liquid nitrogen.
Osmium heptafluoride decomposes to osmium hexafluoride when slightly heated: