Abstract
Abstract Tricyclopentadienyltetrahydrofuranuranium(III), (η 5 -C 5 H 5 ) 3 U·OC 4 H 8 , crystallizes in the centrosymmetric monoclinic space group P2 1 / n with a 8.248(3), b 24.322(17), c 8.357(4) A, β 101.29(5)°, V 1644.0 A 3 and ρ(calc) 2.04 g cm −1 for Z = 4 and mol.wt. 595.0. Diffraction data (Mo-K α , 2θ(max) 45°) were collected on an Enraf-Nonius CAD4 diffractometer and the structure was refined to R w (F) 4.7% for those 1530 reflections having I > 2σ( I ). The molecule consists of a distorted tetrahedral arrangement of THF and (η 5 -C 5 H 5 ) ligands with CpUCp angles in the range 110.4–122.4° and CpUO angles between 90.2 and 106.0°. Individual uranium-carbon distances range from 2.76(2) to 2.82(2) A and average 2.79[1] A. The uranium-oxygen distance of 2.551(10) A suggests a 10-coordinate U 3+ radius of 1.20 A in this class of compounds.
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