Crystal structure of a complex with a substituted methylene ligand bound to a triosmium cluster: Os 3(CO) 10(μ-CO)(μ-CHSiMe 3)

Abstract

The complex Os 3(CO) 10(μ-CO)(μ-CHSiMe 3) crystallizes in the centrosymmetric monoclinic space group P2 1/ n with a 15.463(9), b 9.352(3), c 16.757(7) Å, β 107.38(4)°, V 2312.6(17) Å 3 and Z = 4. Diffraction data (Mo- K α, 2θ(max) = 40°) were collected on a Syntex P2 1 diffractometer and the structure was refined to R F 4.2% and R wF 4.8% for all 2170 data ( R F 3.3%, R wF 4.5% for those 1914 data with | F 0|=>3σ(| F 0|)). The molecule contains a triangular array of osmium atoms in which Os(2) and Os(3) are each associated with three terminal carbonyl ligands, while Os(1) is associated with four terminal carbonyls. Atoms Os(2) and Os(3) are mutually bridged by a nearly symmetrical bridging carbonyl ligand (Os(2)-C(1) 2.186(17) Å; Os(3)-C(1) 2.101(17) Å) and a bridging CHSiMe 3 ligand with Os(2)-C(2) 2.159(15) and Os(3)-C(2) 2.188(16) Å. The structure is an ordered analogue of the species Os 3(CO) 10(μ-CO)(μ-CH 2) which suffers from a four-fold disorder.