Abstract

The synthesis and characterization of two new silicon-carbon bridged ansa-bis(fluorenyl) and ansa-bis(octahydrofluorenyl) zirconocene complexes, (Flu−CH 2−SiMe 2−Flu)ZrCl 2 ( 3) and (FluH 8−CH 2−SiMe 2−FluH 8)ZrCl 2 ( 4) is reported. Complex 3, in combination with methylaluminoxane (MAO), forms an active catalyst system for homogeneous polymerization of ethylene. The molecular structure of 4 reveals a large Centroid-Zr-Centroid angle (131.9°) and an unusually small Cl−Zr−Cl angle (93.2°). The Zr−C bond distances range from 2.48 to 2.64 Å.

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