| Abstract: | Titanium and zirconium complexes with a pyridine diamide ligand, 2,6-(RNCH2)2NC5H3]2? (PDMP; R = 2,6-dimethylphenyl) have been synthesized and their catalytic behaviors investigated for ethylene polymerization. It was found that the zirconium complexes, PDMP]ZrCl2 (7) and PDMP]ZrCl3 × THF]2 (8), gave higher activities than the titanium complexes, PDMP]TiCl2 (5) and PDMP]TiCl3]2 (6). The bimetallic complexes (6, 8) gave higher activities than the corresponding monometallic complexes (5, 7). The titanium complexes gave polymers with higher molecular weight (Mw) than the zirconium complexes. The molecular weight distribution (Mw/Mn) of the polymers obtained from the pyridine diamide complexes were much broader than that of the normal metallocene catalysts. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3756–3762, 1999 |
