The tetrasubstituted polyanions of platinum, palladium, and gold [M(SnB11H11)4]x− (x=6, M=Pd, Pt; x=5, M=Au) have been prepared and characterized by single-crystal X-ray diffraction, elemental analysis, IR, Raman, 11B, and 119Sn heteronuclear NMR spectroscopy. In the case of the platinum derivative [Bu3MeN]6[Pt(SnB11H11)4] (2) 119Sn Mössbauer spectroscopy has been carried out. The isolated salts are stable towards moisture and air and the complexes 2 and 3 were treated with 1,3-bis(diphenylphosphino)propane (dppp) to give the respective substitution products [Bu3MeN]2[(dppp)M(SnB11H11)2] (M=Pd, Pt).
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