The Mackay-type cluster [Cu43Al12](Cp*)12 Open-shell 67 electron superatom with emerging metal-like electronic structure

Abstract : The paramagnetic cluster [Cu Al ](Cp*) was obtained from the reaction of [CuMes] and [AlCp*] (Cp*=η -C Me ; Mes=mesityl). This all-hydrocarbon ligand-stabilized M magic atom-number cluster features a Mackay-type nested icosahedral structure. Its open-shell 67-electron superatom configuration is unique. Three unpaired electrons occupy weakly antibonding jellium states. The situation prefigures the formation of a conduction band, which is in line with the measured temperature-independent magnetism. Steric protection by twelve Cp* ligands suppresses the intrinsic polyradicalar reactivity of the Cu Al core.
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Jana Weßing, Chelladurai Ganesamoorthy, Samia Kahlal, Rémi Marchal, Christian Gemel, et al.. The Mackay-type cluster [Cu43Al12](Cp*)12 Open-shell 67 electron superatom with emerging metal-like electronic structure. Angewandte Chemie International Edition, Wiley-VCH Verlag, In press, 57 (44), pp.14630-14634. ⟨10.1002/anie.201806039⟩. ⟨hal-01834003⟩

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