STRUCTURE OF TRIS-ETA-5-CYCLOPENTADIENYL)URANIUM IODIDE

[U(C5H5)3]I, M(r) = 560.22, orthorhombic, P2(1)2(1)2(1), a = 8.109 (3), b = 13.346 (3), c = 13.626 (3) angstrom, V = 1475 (1) angstrom-3, Z = 4, D(x) = 2.523 g cm-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 124.9 cm-1, F(000) = 1000, T = 295 (1) K, R = 0.037 for 902 observed unique reflections [I greater-than-or-equal-to 1.5-sigma(I)]. The title compound is not isostructural with its bromide, chloride or fluoride analogues. The four halide derivatives exhibit, however, identical coordination polyhedra about the U atom. This atom is surrounded by three eta-5-covalently bonded cyclopentadienyl rings and by one iodide atom in a distorted tetrahedral configuration.