Synthesis of heteroleptic uranium compounds including an asymmetric, sterically unsaturated, bimetallic, organouranium(IV) halide: (C5Me5)(C8H8)ClU(mu-Cl)U(C8H8)(C5Me5)

摘要

K(2)CgH(8) reacts with (C5Me5)(2)UCl2 not by substitution of both chlorides, but by Cl1- and (C5Me5)(1-) ligand displacement to form an asymmetric, sterically unsaturated, mixed ligand metallocene chloride complex, (C5Me5)(C8H8)ClU(mu-Cl)U(C8H8)(C5Me5) (1) Complex 1 is a tetravalent uranium analogue of the asymmetric trivalent yttrium bimetallic complex, (C5Me5)(2)ClY(mu-Cl)Y(C5Me5)(2) (2), that has been used to evaluate coordination of bases with electropositive trivalent metallocenes. Tetravalent 1 similarly coordinates Lewis bases as demonstrated by its reaction with epsilon-caprolactam that generates a complex with four different ligands, (C5Me5)(C8H8)UCl[OCNH(CH2)(5)] (3). Complex 1 also participates in ionic salt metathesis reactions with KN(SiMe3)(2) to form (C5Me5)(C8H8)U[N(SiMe3)(2)] (4). (c) 2005 Elsevier Ltd. All rights reserved.