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Cover Picture: Molecular Cut-Outs of Mo/Zn Hume–Rothery Phases: Synthesis and Structure of [{Mo(CO)4}4(Zn)6(μ-ZnCp*)4] / Twelve One-Electron Ligands Coordinating One Metal Center: Structure and Bonding of [Mo(ZnCH3)9(ZnCp*)3] (Angew. Chem. Int. Ed. 47/2008)



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Two Zinc(I) to one Gallium(I) is the exchange rate for the synthesis of [Mo(ZnCp*)3(ZnMe3)9] from [Mo(GaCp*)6] and ZnMe2 (Cp*=C5Me5). The equally unusual complex [{Mo(CO)4}4(Zn)6(μ-ZnCp*)4] is formed analogously. As molecular cut-outs of a Mo/Zn alloy phase wrapped into tender ligand shells (depicted as bubbles), these are prototypes of a new class of compounds at the borderline of complexes and clusters, as R. A. Fischer, G. Frenking, and co-workers describe in the Communications on pages 9146 ff. and 9150 ff.