Acta Crystallographica Section C

Crystal Structure Communications

Volume 59, Part 4 (April 2003)

metal-organic compounds

 

ansa-[(tert-Butylamino)(isodicyclopentadienyl)dimethylsilane]Zr(NMe₂)₂ prepared by an amine-elimination reaction

J. C. Gallucci, S. Gentil, N. Pirio, P. Meunier, F. Gallou and L. A. Paquette

Abstract: An amine-elimination reaction was used to obtain the title compound, i.e. (N-tert-butyl-N-{[(1,2,3,3a,7a-)-4,5,6,7-tetrahydro-4,7-methano-1H-inden-2-yl]dimethylsilyl}amido-N)bis(N-methylmethanaminato-N)zirconium(IV) or [isodiCpSiMe₂N-tert-butyl]Zr(NMe₂)₂ (Cp is cyclopentadienyl), [Zr(C₁₆H₂₅NSi)(C₂H₆N)₂], in very good yield. Treatment of isodiCpHSiMe₂NH-tert-butyl with Zr(NMe₂)₄ leads to the formation of a yellow solid that can be purified by sublimation. The single-crystal structure of the product shows the exo complexation of the isodicyclopentadienyl ligand to the Zr atom. The Cp portion of this ligand is bonded to the Zr atom in a ⁵ manner, with a Zr-Cg (Cg is the ring centroid) distance of 2.2352 (10) Å. The isodiCpSiMe₂N-tert-butyl ligand has a constrained geometry, which is exhibited by the small angle of 95.55 (10)° for N-Si-C_Cp.

Formula: [Zr(C₁₆H₂₅NSi)(C₂H₆N)₂]

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