NICKEL IRIDIUM CARBONYL CLUSTERS - SYNTHESIS AND SOLID-STATE STRUCTURE OF THE TRIANION [IR3NI6(MU-CO)6(MU-3-CO)2(CO)9]3- - THE 1ST EXAMPLE OF A MIXED IRIDIUM NICKEL CARBONYL CLUSTER

The dark brown [Ir3Ni6(m-CO)6(m3-CO)2(CO)9]3- trianion has been obtained by redox condensation between [Ni(CO)4] and [Ir(CO)4]-. This new mixed-metal cluster is rapidly degraded, at room temperature and atmospheric pressure, by carbon monoxide to form the [Ni(CO)4] and [Ir(CO)4]- parent mononuclear compounds. The metal framework consists of a face-sharing bioctahedron, with the three iridium atoms located in the inner triangle.