Structure
AuCl3 exists as a chloride-bridged dimer both as a solid and as a vapour, at least at low temperatures. Gold(III) bromide behaves analogously. The structure is similar to that of iodine(III) chloride.
In gold(III) chloride, each gold center is square planar, which is typical of a metal complex with a d8 electronic count. The bonding in AuCl3 is considered somewhat covalent.
Read more about this topic: Gold(III) Chloride
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