Crystal and molecular structure of an oxo-centered bis[(pentamethylcyclopentadienyl)uranium]magnesium phosphoylide complex

Article abstract of DOI:10.1021/om00097a003

The crystal and molecular structure of a novel oxo-centered trimetal cluster of two uraniums and one magnesium has been determined by X-ray diffraction in the hexagonal space group P6₅22 (No. 179); cell parameters: a = b = 17.578 (5) ?, c = 46.813 (7) ?, α = β = 90°, γ = 120°, V = 12527 (5) ?³, with R = 0.0634, R_w = 0.0575, and R_G = 0.0641. A Cp* is coordinated to each of the two uraniums, and the two are connected by two bridging [CH₂P(Ph)₂CH₂]^- ligands. Chlorides bridge between each uranium and the magnesium, and the coordination sphere about magnesium is completed by two CH₂=PMePh₂ molecules. In addition to the μ₃-oxo ligand, the two uraniums are also bridged by a μ₂-oxide.