Caesium hexafluorocuprate(IV)

Caesium hexafluorocuprate(IV)
Names
	Other names Cesium hexafluorocuprate; Dicesium hexafluorocuprate
Identifiers
CAS Number	43070-30-0 ;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/2Cs.Cu.6FH/h;;;61H/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
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Caesium hexafluorocuprate is the inorganic compound with the chemical formula Cs
₂CuF
₆. It is a red solid that degrades upon contact with water. It was first prepared be 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

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]

References

^ Jane E. Macintyre, ed. (1992). Dictionary of Inorganic Compounds. CRC Press. p. 3100. ISBN 9780412301209.
^ Harnischmacher, Werner; Hoppe, Rudolf (1973). "Tetravalent Copper: Cs2[CuF6]". Angewandte Chemie International Edition in English. 12 (7): 582–583. doi:10.1002/anie.197305822.
^ Grannec, J.; Tressaud, A.; Hagenmuller, P. (1984). "Some physical properties of d-transition metal fluorides in unusual oxidation states". Journal of Fluorine Chemistry. 25 (1): 83–90. Bibcode:1984JFluC..25...83G. doi:10.1016/S0022-1139(00)81198-7.

Müller, Bernd G. (1987). "Fluoride mit Kupfer, Silber, Gold und Palladium". Angewandte Chemie. 99 (11): 1120–1135. Bibcode:1987AngCh..99.1120M. doi:10.1002/ange.19870991105.
Popova, T. V.; Aksenova, N. V. (2003). "Complexes of Copper in Unstable Oxidation States". Russian Journal of Coordination Chemistry. 29 (11): 743. doi:10.1023/B:RUCO.0000003432.39025.cc. S2CID 93464243.