Caesium hexafluorocuprate(IV)

Caesium hexafluorocuprate is the inorganic compound with the chemical formula Cs₂CuF₆. It is a red solid that degrades upon contact with water. It was first prepared by heating CsCuCl
₃ and caesium fluoride at 410°C under 350 atmospheres of fluorine:^[2]

2 CsCuCl₃ + 2 CsF + 5 F₂ → 2 Cs₂CuF₆ + 3 Cl₂

Caesium hexafluorocuprate(IV)

Names
Other names Cesium hexafluorocuprate; Dicesium hexafluorocuprate
Identifiers
CAS Number	43070-30-0 Y
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[Cu-2](F)(F)(F)(F)F
Properties
Chemical formula	Cs2CuF6
Molar mass	443.35 g/mol
Appearance	Red orange solid[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

The anion [CuF₆]^2- is a rare example of a copper(IV) complex. In terms of its electronic structure, the anion has a low-spin d⁷ configuration. It is thus susceptible to Jahn-Teller distortion.^[3]