Metallaborane chemistry. Part II. Molecular and crystal structure of 1,1 -bis(dimethylphenylphosphine)-2,4-dimethyl-2,4-dicarba-1-platina-closo-dodecaborane

Abstract

The structure of the title compound has been determined by single-crystal X-ray diffraction methods and refined to R 0.033 for 4073 independent observed reflections collected on a diffractometer. Crystals are triclinic, space group P, with a= 9.324(3), b= 10.285(4), and c= 14.208(8)Å, α= 100.40(4), β= 94.32(4), and γ= 98.95(3)°. The carbaborane fragment has a distorted icosahedral geometry with the carbon atoms at positions 2 and 4 (relative to the metal at 1). The platinum atom is ca. 1.81 Å above a (non-planar) C₂B₃ face which in turn is nearly perpendicular to the PtP₂ plane. Pt–P Distances are 2.249(2) and 2.303(2)Å. All the hydrogen atoms in the molecule have been located and positionally refined.