Tetraxenonogold(II)

{{Chembox

| ImageFile = Tetraxenonogold%28II%29-3D-balls.png

| ImageSize =

| IUPACName = Tetraxenonogold(II)

| OtherNames =

|Section1={{Chembox Identifiers

| CASNo =

| PubChem = 139031022

| ChemSpiderID = 21106483

| SMILES = [Xe+][Au-2]([Xe+])([Xe+])[Xe+]

| InChI = 1/Au.4Xe/q+2;;;;/rAuXe4/c2-1(3,4)5/q+2

| InChIKey = FIAFJDZYGVZLAJ-YSLMZIHEAX

| StdInChI = 1S/Au.4Xe/q+2;;;;

| StdInChIKey = FIAFJDZYGVZLAJ-UHFFFAOYSA-N

}}

|Section2={{Chembox Properties

| Au=1 | Xe=4 | Formula_Charge=+2

| Appearance =

| Density =

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|Section3={{Chembox Hazards

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Tetraxenonogold(II), gold tetraxenide(II) or AuXe{{su|b=4|p=2+}} 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 AuXe{{su|b=4|p=2+}}(Sb{{su|b=2}}F{{su|b=11|p=−}}){{su|b=2}} (tetraxenonogold(II) undecafluorodiantimonate). This compound, which exists in triclinic and tetragonal crystal modifications,{{cite book

| title = Advanced Structural Inorganic Chemistry

| url = https://archive.org/details/advancedstructur00liwa

| url-access = limited

| author1 = Wai-Kee Li

| author2 = Gong-Du Zhou

| author3 = Thomas C. W. Mak

|editor1=Gong-Du Zhou|editor2=Thomas C. W. Mak

| publisher = Oxford University Press

| year = 2008

| isbn = 978-0-19-921694-9

| page = [https://archive.org/details/advancedstructur00liwa/page/n700 678]

}} has the AuXe{{su|b=4|p=2+}} ion is stabilised by interactions with the fluoride atoms of the counterion. The Au−Xe bond length is {{cvt|274|pm|Å}}.{{cite book

| title = Advanced Structural Inorganic Chemistry

| url = https://archive.org/details/advancedstructur00liwa

| url-access = limited

| first1 = Wai-Kee

| last1 = Li

| first2 = Gong-Du

| last2 = Zhou

| others = Thomas C. W. Mak

| publisher = Oxford University Press

| year = 2008

| isbn = 978-0-19-921694-9

| page = [https://archive.org/details/advancedstructur00liwa/page/n96 74]

}}{{cite book

| title = Introduction to modern inorganic chemistry

| first1 = Kenneth Malcolm

| last1 = Mackay

| first2 = Rosemary Ann

| last2 = Mackay

| first3 = W.

| last3 = Henderson

| edition = 6th

| publisher = CRC Press

| year = 2002

| isbn = 0-7487-6420-8

| page = 496

}}

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.{{cite journal|first1=Stefan Seidel|last1=Konrad Seppelt|date=2000-10-06|title=Xenon as a Complex Ligand: The Tetraxenonogold(II) Cation in {{chem|AuXe|4|2+|(Sb|2|F|11|−|)|2}}|journal=Science|volume=290|issue=5489|pages=117–118|doi=10.1126/science.290.5489.117|pmid=11021792|last2=Seppelt|first2=K|bibcode = 2000Sci...290..117S }} Four xenon atoms bond with the gold(II) ion to make this complex.

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.{{Cite journal |last1=Hwang |first1=In-Chul |last2=Seidel |first2=Stefan |last3=Seppelt |first3=Konrad |date=2003-09-22 |title=Gold(I) and Mercury(II) Xenon Complexes |journal=Angewandte Chemie International Edition |language=en |volume=42 |issue=36 |pages=4392–4395 |doi=10.1002/anie.200351208 |pmid=14502720 |issn=1433-7851}}