Gold halide
{{Short description|Compound of gold with a halogen}}
Monohalides
AuCl, AuBr, and AuI are all crystalline solids with a structure containing alternating linear chains: ..-X-Au-X-Au-X-Au-X-... The X-Au-X angle is less than 180°.{{Greenwood&Earnshaw2nd}}
The monomeric AuF molecule has been detected in the gas phase.{{cite journal |author1=D. Schröder |author2=J. Hrušák |author3=I. C. Tornieporth-Oetting |author4=T. M. Klapötke |author5=H. Schwarz | title = Neutral Gold(I) Fluoride Does Indeed Exist | year = 1994 | journal = Angewandte Chemie International Edition in English | volume = 33 | issue = 2 | pages = 212–214 | doi = 10.1002/anie.199402121 }}
Trihalides
Gold triiodide does not exist or is unstable.{{citation|author1=Schulz, A. |author2=Hargittai, M. |year=2001|title=Structural variations and bonding in gold halides: A quantum chemical study of monomeric and dimeric gold monohalide and gold trihalide molecules, AuX, Au2X2, AuX3, and Au2X6 (X = F, Cl, Br, I)|journal=Chemistry - A European Journal|volume=7|number=17|pages=3657–3670|doi=10.1002/1521-3765(20010903)7:17<3657::aid-chem3657>3.0.co;2-q|pmid=11575767}}
Gold(III) fluoride, AuF3, has a unique polymeric helical structure, containing corner-sharing {AuF4} squares.
Pentahalides
Gold(V) fluoride, AuF5, is the only known example of gold in the +5 oxidation state. It most commonly occurs as the dimer Au2F10.