Electrode reactions of monovalent and trivalent bromoaurates, [Au^B^]- and [AumBr4]-, have been investigated in an amide-type ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide. [AumBr4]- could be reduced to metallic Au via an intermediate species, [AuIBr2]-, which was stable in the ionic liquid. [AuIBr2]- could be prepared by a proportionation reaction of [AumBr4]- and Au in the ionic liquid. Although metallic Au was deposited on a glassy carbon substrate at -1.5 V vs. Ag/Ag(I), Au nano-particles with an average diameter of (2.6 ± 0.6) nm were formed and dispersed in the ionic liquid by potentiostatic cathodic reduction on a glassy carbon electrode at -2.5 V vs. Ag/Ag(I).
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