Binuclear organometallic compounds. Part IV. Crystal and molecular structure of chlorobis(π-cyclopentadienyl)(triphenylsilyl)zirconium(IV)

Abstract

The crystal structure of chlorobis(π-cyclopentadienyl)(triphenylsilyl)zirconium(IV) has been determined by X-ray diffraction methods. A monoclinic unit cell of dimensions a= 10·071(4), b= 17·331(7), c= 16·329(7)Å, and β= 121·57(3)°, contains four monomeric (π-C₅H₅)₂ZrCl(SiPh₃) molecules. The space group is P2₁/c. The structure has been refined by least-squares methods to a conventional R of 0·058, based on 2488 intensities measured on an automatic four-circle diffractometer. The co-ordination about the silicon atom is approximately tetrahedral; the co-ordination about the zirconium atom is also roughly tetrahedral, if the cyclopentadienyl ligands are regarded as unidentate. The Zr–Cl distance is 2·430(3)Å. The Zr–Si bond is unexpectedly long; its length, not previously determined, is 2·813(2)Å.