Reaction of biscyclopentadienyl derivatives of zirconium containing unlike ligands with water

Abstract

1. A common feature of the biscyclopentadienyl complexes of zirconium [Cp2ZrX]2O, X = Cl, Br, and Cp2ZrClY, Y=NO3, C15H11O2, is the elimination of one Cp ligand by the action of water. The readily hydrolyzed phenoxyl groups protect the initial complex Cp2ZrCl(OC6H5) from cleavage of the Cp-Zr bond. 2. In the CpZrX(OH)2·H2O complexes the hydroxyl ligands are readily exchanged by the action of nitric acid and dibenzoylmethane. 3. The Zr-O stretching vibrations in the Zr-OH group are characterized by broad bands of medium intensity in the region of 500–550 cm−1.