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 [CuF62- 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.
ISBN9780412301209.
^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: 83–90.
doi:
10.1016/S0022-1139(00)81198-7.
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.
S2CID93464243.