Caesium hexafluorocuprate(IV) explained

Caesium hexafluorocuprate is the inorganic compound with the chemical formula . It is a red solid that degrades upon contact with water. It was first prepared be heating and caesium fluoride at 410°C under 350 atmospheres of fluorine:^[1]

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.^[2]

Further reading

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

Notes and References

1. 10.1002/anie.197305822 . Tetravalent Copper: Cs2[CuF6] . 1973 . Harnischmacher . Werner . Hoppe . Rudolf . Rudolf Hoppe. Angewandte Chemie International Edition in English . 12 . 7 . 582–583.
2. 10.1016/S0022-1139(00)81198-7 . Some physical properties of d-transition metal fluorides in unusual oxidation states . 1984 . Grannec . J.. Tressaud. A.. Hagenmuller. P. . Journal of Fluorine Chemistry . 25 . 1 . 83–90 . 1984JFluC..25...83G .