[{Ir( η ⁵ ‐C ₅ Me ₅ )(CO)} ₆ Hg ₈ ][CF ₃ CO ₂ ] ₆ , a Mixed‐Metal Cluster with an Ir ₆ Hg ₆ Twelve‐Membered Ring and Additional Hg Centers and Metal–Metal Bonds

The ambient temperature reaction of [Ir(η5-C5Me5)(CO)2] with Hg(CF3CO2)2 yields a mixed-metal cluster of iridium and mercury (see picture) which contains the novel Ir6Hg6 twelve-membered ring comprising six [Ir(η5-C5Me5)(CO)] fragments connected to each other through mercury centers; additional mercury centers and metal–metal bonds give rise to a network within the ring.