Octafluoride

An octafluoride is a compound or ion with the formula [MmRnF8]q− or [MmRnF8]q+, 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 [MF8]q− with q between 1 and 4 inclusive.

Neutral octafluorides

No electrically neutral octafluorides are currently known to exist, although osmium octafluoride, OsF8, is theoretically possible. An early report of the synthesis of OsF8 was much later shown to be a mistaken identification of OsF6.[1]

Anionic octafluorides

In contrast, many anionic octafluorides are known, such as the octafluorozirconate(IV) ([ZrF8]4−), octafluorotantalate(V) ([TaF8]3−), octafluoroniobate(V) ([NbF8]3−),[1] octafluoromolybdate(VI) ([MoF8]2−),[1] octafluorotungstate(VI) ([WF8]2−),[1] octafluororhenate(VII) ([ReF8]−),[1] octafluoroiodate(VII) ([IF8]−), octafluoroiridate(VII) ([IrF8]−),[2] and octafluoroxenate(VI) ([XeF8]2−) anions.

References
  1. Riedel, S.; Kaupp, M. (30 Jul 2009). "The highest oxidation states of the transition metal elements". Coordination Chemistry Reviews. 253 (5–6): 606–624. doi:10.1016/j.ccr.2008.07.014.
  2. Jianyan Lin, Ziyuan Zhao, Chunyu Liu, Jing Zhang, Xin Du, Guochun Yang, and Yanming Ma (March 13, 2019). "IrF8 Molecular Crystal under High Pressure". J. Am. Chem. Soc. 141 (13): 5409–5414. doi:10.1021/jacs.9b00069. PMID 30864432. S2CID 76664353.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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