Gold halide

Gold halides are compounds of gold with the halogens.

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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 180°.^{[citation needed]}

Trihalides

The triiodide does not exist.^{[citation needed]} AuCl₃ readily forms out of the elements at temperatures below 254^oC. It is a volatile red solid. The volatile species is the dimer Au₂Cl₆.^{[citation needed]}