Octafluoride

An octafluoride is a compound or ion with the formula R_nM_xF₈^y− or R_nM_xF₈^y+, where n, x, and y are independent variables and R any substituent and M is a central element (often a metal). All of the examples listed below are M_xF₈^y− with x=1 and y 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 (ZrF₈⁴⁻), octafluorotantalate (TaF₈³⁻), octafluoroniobate (NbF₈³⁻),[1] octafluoromolybdate (MoF₈²⁻),[1] octafluorotungstate (WF₈²⁻),[1] octafluororhenate (ReF₈⁻),[1] octafluoroiodate (IF₈⁻), octafluoroiridate (IrF₈⁻),[2] and octafluoroxenate (XeF₈²⁻) anions.

References

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.
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.{{cite journal}}: CS1 maint: multiple names: authors list (link)

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[fluorides-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.{{cite journal}}: CS1 maint: multiple names: authors list (link)