Structure cristalline et moléculaire du cyclopentadiényle dicarbonyle dioxyde de soufre manganèse MnC₅H₅(CO)₂SO₂

Abstract

The compound MnC 5 H 5 (CO) 2 SO 2 crystallizes in the monoclinic system, space group P2 1 /c, in a unit cell of dimensions a = 10.98(2) Å, b = 10.63(2) Å, c = 7.43(2) Å, β = 100.75(8)° with Z = 4. The structure was determined from 1512 reflections obtained on films from a precession camera; the residual factor, R, was 0.093 after a full matrix least-squares refinement. The Mn–S bond seems very strong having a length (2.037(5) Å) which is smaller than the sum of the covalent radii by 0.3 Å The average distance [Formula: see text] is less than that usually observed in manganese–cyclopentadienyl complexes. The two CO groups are distinct. The instability of the complex might be explained, in part, by the crowding of the SO 2 and CO ligands. [Journal translation]