BRIDGED INDENYLIDENE-CYCLOPENTADIENYLIDEN E COMPLEXES OF TYPE (C9H5CH2PH-X-C5H4)MCL2 (X = CME2, SIME2 M = ZR, HF) AS METALLOCENE CATALYSTS FOR ETHYLENE POLYMERIZATION - MOLECULAR-STRUCTURE OF (C9H5CH2PH-CME2-C5H4)MCL2 (M = ZR, HF)

The synthesis and NMR spectroscopic characterization of new ansa metal locene dichloride complexes of the type (C9H5CH2Ph-X-C5H4)ZrCl2 (X = C Me2, SiMe2; M = Zr, Hf) are reported. These ansa metallocene complexes and the unbridged derivative (C9H6CH2Ph)(C5H5)ZrCl2 can be activated with methyl aluminoxane (MAO) to polymerize ethylene. The benzyl subst ituent in the 3-position of the indenyl ligand and the nature of the b ridge X have an influence on the activity of these catalysts. These pa rameters also determine the molecular weights of the polymers. Two ans a metallocene complexes (4, 5) were also characterized by X-ray diffra ction.