Unsaturated amido-substituted six-vertex mixed silicon germanium clusters

The synthesis of mixed silicon and germanium clusters SiGe_6-{N(SiMe₃)Dipp}₄1-3 (x = 3.7, 3.1, 2.1) with amido-substituents and two unsubstituted germanium atoms was achieved in co-reductions using the tribromosilane {N(SiMe₃)Dipp}SiBr₃ and the tribromogermane {N(SiMe₃)Dipp}GeBr₃ in three different ratios. The ratio of Si and Ge used for the synthesis of 1-3 approximately corresponds to that in the final products. All compounds were characterized by single crystal X-ray diffraction and EI mass spectrometry. In addition, 1 and 2 were characterized by solid-state ²⁹Si{¹H} CP/MAS NMR spectroscopy and multinuclear NMR spectroscopy in solution.