Molecular and crystal structures of adducts (Cp2YCl)2L (L = 2THF, DME, 1,4-dioxane)

The adducts [Cp2Y(μ-Cl)]2 · 2THF (5), {[Cp2Y(μ-Cl)]2 · 1,4-dioxane}n (6), and Cp2Y(DME)(μ-Cl)(Cl)YCp2 (7) have been synthesized and studied by X-ray crystallography. In 5, the (Cp2YCl)2 moiety is coordinated to two THF molecules (d (Y-O) = 2.478 Å); in 6 the (Cp2YCl)2 dimers are linked by 1,4-dioxane to form a polymer chain (d (Y-O) = 2.601 Å). In asymmetric adduct 7, the DME molecule is bound through both O atoms to the same Y atom (d (Y-O) = 2.382 and 2.448 Å), and one of the chlorine atoms is bridging and the other chlorine atom is terminal.