Crystal and molecular structure of [Co8(CO)21(µ5-CS2)(µ5-C2S)]: a thiocarbonyl group as a six-electron donor

Abstract

The compound [Co₈(CO)₂₁(µ₅-CS₂)(µ₅-C₂S)], a minor product of the reaction between [Co₂(CO)₈] and CS₂, has been characterized by X-ray diffraction analysis. The crystals are monoclinic, space group Cc, with a= 9.208(4), b= 15.864(6), c= 25.36(1), β= 96.39(3)°, and Z= 4. The Co atoms were located by the Patterson method, the S, C, and O atoms by Fourier difference maps. The final R was 0.0899 for 3 206 reflections with F > 6σ(F). The structure consists of an assembly of three cobalt clusters, the central one being the most interesting part of the complex, as it shows an unprecedented Co₂(µ-SC) fragment. The compound is formally derived from a previously reported one by isolobal substitution of a Co(CO)₃ group by a C–R group [R = CCo₃(CO)₉].