Acta Cryst. (2009). E65, m92  [ doi:10.1107/S1600536808040713 ]

Dibromido[bis(⁵-cyclopentadienyl)dimethylsilane]zirconium(IV)

M. Erben, M. Dusek, M. Picka and J. Vinklárek

Abstract: The title molecule, [ZrBr₂(C₁₂H₁₄Si)], possesses a crystallographically imposed twofold rotational symmetry with the rotation axis passing through the Zr and Si atoms. The Zr^IV centre is in a distorted tetrahedral environment defined by two Cp rings of chelating organic ligands and two Br anions. Two five-membered rings form a dihedral angle of 59.7 (2)°. Unequal Zr-C bonds [2.471 (3)-2.556 (3) Å] in the molecule indicate that the interaction of the central metal with the [(C₅H₄)₂SiMe₂]^2- ligand contains noticeable ³-allyl and ²-olefin contributions.

Online 17 December 2008

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