Tetraxenonogold(II), gold tetraxenide(II), or AuXe2+4 is a cationic complex consisting of a central gold atom surrounded by four xenon atoms. It is a covalent complex with a square planar geometry. The complex is found in the compound AuXe2+4(Sb2F−11)2 (tetraxenonogold(II) undecafluorodiantimonate). This compound, which exists in triclinic and tetragonal crystal modifications, has the AuXe2+4 ion that is stabilised by interactions with the fluoride atoms of the counterion. The Au−Xe bond length is 274 pm (2.74 Å). Tetraxenonogold(II) is unusual in that it is a coordination complex of xenon, which is weakly basic. It is also unusual in that it contains gold in the +2 oxidation state. It can be produced by reduction of gold(III) fluoride (AuF3) by xenon in the presence of fluoroantimonic acid. The salt crystallises at low temperature.