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Keywords:

  • cluster compounds;
  • density functional calculations;
  • platinum;
  • tin;
  • zwitterions

Abstract

Three stannaborate complexes of platinum(II) and a novel stannoborate palladium(II) derivative have been prepared in excellent yield. The tin transition metal bond is formed through nucleophilic substitution and the resulting complexes [Bu3MeN][trans-{(Et3P)2Pt(SnB11H11)H}] (6), [trans-{(Et3P)2Pt(SnB11H11)(CNtBu)}] (7), [Bu3MeN]2[trans-{(Et3P)2Pt(SnB11H11)2(CNtBu)}] (8), and [Bu3MeN][(dppe)Pd(SnB11H11)Me] (12) (dppe=1,2-bis(diphenylphosphanyl)ethane) were characterized by NMR spectroscopy and elemental analysis. In the cases of the zwitterion 7, the pentacoordinated complex 9, the palladium salt 12 and [(triphos)Pt(SnB11H11)] (10) (triphos=1,1,1-tris(diphenylphosphanylmethyl)ethane), their solid-state structures are determined by X-ray crystal structure analyses. The trans influence of the [SnB11H11] ligand is evaluated from the results of the IR spectroscopy and X-ray crystallographic structures of complexes 6, 7, and 12. The dipole moment of the zwitterion 7 is calculated by density functional theory (DFT) methods. The alignment of the dipole moments of the polar molecules 7 and 12 in the solid state is discussed.