Carbaborane derivatives of the late- and post-transition elements. Part 1. Preparation and X-ray crystal structure of 3-diethyldithio-carbamato-1,2-dicarba-3-auradodecaborane(11)

Abstract

The reaction of [AuBr₂(S₂CNEt₂)] with Tl[B₉ C₂^1.2Tl³H₁₁] yields the known ion [3.3′-Au(B₉C₂^1.2H₁₁)₂]^– as its [Au(S₂CNEt₂)₂]⁺ salt, and also the novel carba-auraborane B₉C₂^1.2[Au(S₂CNEt₂)]³H₁₁. The latter is shown from single-crystal X-ray data to have a distorted structure, in which the metal atom is bonded principally to the three boron atoms of the C₂B₃ open face [Au–B(av.) 2.22(1); Au–C(av.) 2.78(1)Å], which is distinctly non-planar, illustrating the severe distortions which occur within the B₉C₂ framework. The crystals are monoclinic, space group P2₁/c, with cell dimensions a= 7.3710(6). b= 11.0368(9), c= 21.1564(17)Å, and β= 93.22(4)°. The structure has been refined to R 0.039 for 1 962 independent observed reflections.