The tetrasubstituted polyanions of platinum, palladium, and gold [M(SnB(11)H(11))(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, (11)B, and (119)Sn heteronuclear NMR spectroscopy. In the case of the platinum derivative [Bu(3)MeN](6)[Pt(SnB(11)H(11))(4)] (2) (119)Sn 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 [Bu(3)MeN](2)[(dppp)M(SnB(11)H(11))(2)] (M=Pd, Pt).

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Platinum metalsPlatinum metals I 7700 Square-Planar Coordinated Polyanions of Palladium, Platinum, and Gold Stannaborate [SnB 11 H 11 ] 2-Coordination Chemistry. -Tetrastannoborates of Pt, Pd, and Au are synthesized and characterized by single crystal XRD, IR, Raman, and 11 B and 119Sn NMR spectroscopy. The stanna-closo-dodecaborate clusters are in a square-planar coordination mode to the d 8 -transition metal centers. The tin polyborate ligand is nucleophilic enough to displace the cyclo-octadiene ligand in the complexes (I). Compounds (IIIa) and (VI) crystallize in the triclinic space group P1 with Z = 1 and compound (VII) in the orthorhombic space group Pnab with Z = 4. -(MARX, T.; MOSEL, B.; PANTENBURG, I.; HAGEN, S.; SCHULZE, H.; WESEMANN*, L.; Chem. Eur.