[(Me3Si)Si]3EtGe9Pd(PPh3), a Pentafunctionalized Deltahedral Zintl Cluster: Synthesis, Structure, and Solution Dynamics
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The title compound, which has a ten-atom deltahedral cluster core of Ge9Pd, was synthesized through insertion of Pd(PPh3) into the tetrasubstituted nona-germanium cluster [(Me3Si)Si]3EtGe9through a reaction of the latter with Pd(PPh3)4. This first reaction of neutral tetrasubstituted nine-atom clusters shows that they retain reactivity despite their neutral charge. The Ge9Pd core is the first that incorporates a 5-connected transition metal other than from Group VI, a noble metal in this case. Single-crystal X-ray diffraction shows that the ten-atom core is a closo-cluster with the expected shape of a bicapped square antiprism.1H and13C NMR spectroscopy show that, in contrast to the parent tetra-substituted [(Me3Si)Si]3EtGe9, the new compound does not exhibit dynamics. Relativistic DFT calculations are used to explain the differences. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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