Octafluoride

An octafluoride is a compound or ion with the formula [M_mR_nF₈]^q− or [M_mR_nF₈]^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

^ ^a ^b ^c ^d ^e 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. doi:10.1021/jacs.9b00069. PMID 30864432. S2CID 76664353.{{cite journal}}: CS1 maint: multiple names: authors list (link)

[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. doi:10.1021/jacs.9b00069. PMID 30864432. S2CID 76664353.{{cite journal}}: CS1 maint: multiple names: authors list (link)

[1]

[2]