Nickel, palladium, and platinum complexes of the ditertiary stibine 1,3-bis(dimethylstibino)propane

Abstract

1,3-Bis(dimethylstibino)propane (dmsp), Me₂Sb[CH₂]₃SbMe₂, and some of its complexes with Ni^II, Pd^II, and Pt^II are reported. The nickel(II) complexes [Ni(dmsp)₂X][ClO₄](X = Cl, Br, or I) and [Ni(dmsp)₂(OH₂)][ClO₄]₂ have five-co-ordinate square-pyramidal cations, in contrast to the complexes of the corresponding ditertiary arsine which are trigonal bipyramidal. The palladium(II) and platinum(II) complexes [M(dmsp)X₂](X = Cl, Br, I, or CNS), are planar and the thiocyanates exhibit novel M–NCS co-ordination in solution, the first examples of this in stibine complexes. Antimony-121 Mössbauer spectra have been obtained for some dmsp complexes and for complexes of the related ligand Ph₂Sb[CH₂]₃SbPh₂, and the parameters obtained are discussed in terms of the metal–ligand bond.