Fullerene can bind a variety of metal clusters via η2-C60, μ-η2: η2-C60, and μ3-η2:η2: η2-C60 π-type bonding modes. Multiple C60 additions to a single cluster core have also been demonstrated. Modification of the coordination sphere of cluster moieties has resulted in novel transformation of the coordination mode of the C60 ligand between π and σ (μ3-η1:η1: η2-C60 and μ3-η1:η2: η1-C60) types as well as reversible interconversion between μ3-η2:η2: η2-C60 and μ-η2:η2-C60. The μ3-η2:η2:η2 metal cluster complexes show remarkable electrochemical stability and an unusually strong electronic communication between C60 and metal cluster centers.
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