Gold iodide is the chemical compound with the formula AuI3. Although Au2I6 is predicted to be stable,[1] gold(III) iodide remains an example of a nonexistent or unstable compound.[2] Attempts to isolate pure samples result in the formation of gold(I) iodide and iodine:
^Schulz, A.; Hargittai, M. (2001), "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)", Chemistry - A European Journal, 7 (17): 3657–3670, doi:10.1002/1521-3765(20010903)7:17<3657::aid-chem3657>3.0.co;2-q, PMID11575767; also see cover picture description