A Silicon-Bridged Bis(substituted Cp) Yttrium Complex

Abstract

rac-Bis(tetrahydrofuran)lithium [bis(2-trimethylsilyl-4-tert-butyl-η^5-cyclopentadienyl)dimethylsilane] dichloroyttrate, [Li(C_4H_80)_2][Y(C_(26)H_(48)-Si_3)Cl_2], M_r= 755.87, triclinic, Pl, ɑ = 13.110 (8), b = 17.163 (15), c = 20.623 (14) Å, ɑ= 104.02 (7), β = 99.38 (5), y = 100.24 (6)º, V = 4326 (6) Å^3, z = 4, D_x = 1.16 g cm^(-3), λ(Mo Kɑ)= 0.71073 Å, μ = 15.86 cm^(-1), F(000) = 1608, room temperature, R = 0.056 for 6136 reflections with F_o^2 > 3σ(F_o^2). There are two virtually identical molecules in the asymmetric unit. In each, the Y atom is tetrahedrally coordinated to a substituted Si-bridged bis(cyclopentadienyl) ligand and to two Cl ions in the cleft. The Li atom is 2.35 Å from each Cl ion, and two molecules of tetrahydrofuran are connected to the Li, completing its tetrahedral coordination.