The new green [F~&U(CO),~]-cluster anion, isolated from the reaction of [Fe3(CO)11]2-with [AuCI4]-salts, displays a bow-tie metal structure similar to that of the [Fe4M(C0)16]2-(M = Pd, R) dianions; its chemical and electrochemical reduction sequentially affords the corresponding [Fe4AU(CO)16]2-and [ F e & ~( C 0 ) ~~] 3 -anions, the former of which may be considered as a formal d9 gold(ii) complex of the [Fe2(C0)& ligand.
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