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Capping nido-Nonagermanide Clusters with M‑PPh3 and Dynamics in Solution: Synthesis and Structure of closo-[(Me3Si)3Si]3Et[Ge9M](PPh3) (M = Ni, Pt)

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journal contribution
posted on 07.12.2018, 00:00 by Sabine Frischhut, Felix Kaiser, Wilhelm Klein, Markus Drees, Fritz E. Kühn, Thomas F. Fässler
In this work, cluster expansion of nine-atomic germanium clusters with nickel and platinum atoms is reported. The compounds [(Me3Si)3­Si]3­Et­[Ge9Ni]­(PPh3) and [(Me3Si)3­Si]3­Et­[Ge9Pt]­(PPh3) are characterized by NMR spectroscopy, elemental analysis, and single crystal X-ray structure analysis. The latter represents the first intermetalloid Ge-Pt cluster with a platinum atom as part of a deltahedron. So far, only one compound of this type has been reported for the homologous Pd. Hence, with these new compounds, metal-coordinated deltahedral Ge9 clusters are now known for the whole triad of group 10 elements. The cluster compounds are accessible by treating [(Me3Si)3­Si]3­EtGe9 with η2-ethylene-bis-(triphenyl­phos­phine)-nickel­(0) and η2-ethylene-bis-(triphenyl­phos­phine)-platinum­(0), respectively, in toluene. The crystal structure determination reveals ten-vertex-closo-[Ge9M]-cluster cores (M = Ni, Pt) bearing five exo-bonded ligands. Unlike the nine-vertex-cluster [(Me3Si)3­Si]3­EtGe9, the penta-functionalized platinum containing cluster compound [(Me3Si)3­Si]3­Et­[Ge9Pt]­(PPh3) does not show fluctuating behavior in solution over a wide temperature range on the NMR time scale, whereas the [(Me3Si)3­Si]3­Et­[Ge9Ni]­(PPh3) shows highly dynamic processes in solution at ambient temperature.