An octafluoride is a compound or ion with the formula or , where ''n'', ''m'' and ''q'' are independent variables and R any substituent and M is a central element (often a metal). All of the examples listed below are with ''q'' between 1 and 4 inclusive.
Neutral octafluorides
No electrically neutral octafluorides are currently known to exist, although
osmium octafluoride
Osmium () is a chemical element; it has symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest natura ...
, , is theoretically possible. An early report of the synthesis of was much later shown to be a mistaken identification of
.
Anionic octafluorides
In contrast, many anionic octafluorides are known, such as the octafluorozirconate(IV) (), octafluorotantalate(V) (), octafluoroniobate(V) (),
octafluoromolybdate(VI) (),
octafluorotungstate(VI) (),
(),
octafluoroiodate(VII) (), octafluoroiridate(VII) (),
and
octafluoroxenate(VI) () anions.
References
{{reflist
Fluorides