title: Dibromido[bis-(η-cyclo-penta-dien-yl)dimethyl-silane]zirconium(IV).
abstract: The title mol-ecule, [ZrBr(2)(C(12)H(14)Si)], 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 tetra-hedral 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 mol-ecule indicate that the inter-action of the central metal with the [(C(5)H(4))(2)SiMe(2)](2-) ligand contains noticeable η(3)-allyl and η(2)-olefin contributions.
authors.affiliation: Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Nám. Čs. legií 565, Pardubice 532 10, Czech Republic.
authors.forename: Milan
authors.initials: M
authors.lastname: Erben
authors.forename: Michal
authors.initials: M
authors.lastname: Dušek
authors.forename: Michal
authors.initials: M
authors.lastname: Picka
authors.forename: Jaromír
authors.initials: J
authors.lastname: Vinklárek