Abstract
The solid state structure of μ-ethylthio-μ′-carbonylbis(η-cyclopentadienylcarbonyliron) hexaflouroantimonate has been determined by a single crystal X-ray analysis. Crystals of this compound are monoclinic, space group c2/c with a = 18.111(6), b = 16.450(5), c = 13.292(4) Å, β = 92.2(1)°, Z = 8. The determination was by Patterson and Fourier methods. A full matrix least-squares refinement resulted in a final R value of 0.044 for 1505 independent reflections. The two cyclopentadienyl groups are cis disposed with respect to the Fe—Fe vector while both the sulphur atom of the ethylthio group and the carbon atom of the bridging carbonyl group are equidistant from the two iron atoms. The latter are separated by a distance of 2.580(2) Å corresponding to a two electron Fe—Fe bond. The solution IR and NMR data are consistent with the cation retaining its cis structure in solution.
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