Tetraxenonogold(II)

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 configuration of atoms. The complex is found in the compound AuXe²⁺
₄(Sb
₂F⁻
₁₁)
₂ (tetraxenonogold(II) undecafluorodiantimonate). This compound, which exists in triclinic and tetragonal crystal modifications,^[1] has the AuXe²⁺
₄ ion is stabilised by interactions with the fluoride atoms of the counterion. The Au−Xe bond length is 274 pm (2.74 Å).^[2][3] 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 AuF₃ by xenon in the presence of fluoroantimonic acid. The salt crystallises at low temperature.^[4] Four xenon atoms bond with the gold(II) ion to make this complex.

Tetraxenonogold(II)

Names
IUPAC name Tetraxenonogold(II)
Identifiers
3D model (JSmol)	Interactive image
ChemSpider	21106483
PubChem CID	139031022
InChI InChI=1S/Au.4Xe/q+2;;;; Key: FIAFJDZYGVZLAJ-UHFFFAOYSA-N InChI=1/Au.4Xe/q+2;;;;/rAuXe4/c2-1(3,4)5/q+2 Key: FIAFJDZYGVZLAJ-YSLMZIHEAX
SMILES [Xe+][Au-2]([Xe+])([Xe+])[Xe+]
Properties
Chemical formula	AuXe4+2
Molar mass	722.137 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

It was the first description of a compound between a noble gas and a noble metal. It was first described in 2000 by Konrad Seppelt and Stefan Seidel. Several related compounds containing gold(III)–xenon and gold(I)–xenon bonds have since been isolated. A compound containing a mercury–xenon bond [HgXe]²⁺[Sb₂F₁₁]^–[SbF₆]^– (xenonomercury(II) undecafluorodiantimonate hexafluoroantimonate) has also been isolated.^[5]