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)

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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.

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