Caesium hexafluorocobaltate(IV)

Caesium hexafluorocobaltate(IV) is a salt with the chemical formula Cs
₂CoF
₆. It can be synthesized by the reaction of Cs
₃[(CoCl
₄)Cl] and fluorine.^[1] The salt contains rare example of cobalt(IV) complex, i.e. [CoF₆]^2-.

Caesium hexafluorocobaltate(IV)

Identifiers
CAS Number	17250-28-1
3D model (JSmol)	Interactive image
InChI InChI=1S/2Cs.Cu.6FH/h;;;6*1H/q2*+1;+4;;;;;;/p-6 Key: JSYFPWMRKBASLN-UHFFFAOYSA-H
SMILES [Cs+].[Cs+].F[Co-2](F)(F)(F)(F)F
Properties
Chemical formula	CoCs2F6
Molar mass	438.734517 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

It has cubic K₂PtCl₆ structure, with the lattice constant a = 8.91 Å, and the length of Co-F bond is 1.73 Å.^[1] The complex is ferromagnetic and the ground state of Co(IV) is T_2g³E_g².^[2]

See also

• Percobaltate

References

1. Quail, J. W.; Rivett, G. A. (1 August 1972). "Complex Fluorides of Tetravalent Cobalt". Canadian Journal of Chemistry. 50 (15): 2447–2450. doi:10.1139/v72-394.
2. Allen, Geoffrey Charles; Warren, Keith D. (1 September 1969). "Electronic spectrum of the hexafluorocobaltate(IV) anion". Inorganic Chemistry. 8 (9): 1902–1904. doi:10.1021/ic50079a019.