Heterodimetallic Complexes with an Unbridged, Polar Metal–Metal Bond

The metal–metal bonds are stable without bridging ligands in the heterodinuclear complexes 1 and 2. The combination of one metal center in a high oxidation state and one in a low oxidation state causes these bonds to be strongly polarized. The reactivity of such systems promises to be interesting–recently the direct insertion of CO2 into the ZrFe and ZrRu bond of related complexes has been achieved. R = p‐tolyl. equation image