The synthesis and polymerization behavior of bimetallic pyridine diamide complexes containing transition metal (Ti, Zr)

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Titanium and zirconium complexes with a pyridine diamide ligand, [2,6-(RNCH 2 ) 2 NC 5 H 3 ] 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]ZrCl 2 (7) and [PDMP][ZrCl 3 x THF] 2 (8), gave higher activities than the titanium complexes, [PDMP]TiCl 2 (5) and [PDMP][TiCl 3 ] 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 (M w ) than the zirconium complexes. The molecular weight distribution (M w /M n ) of the polymers obtained from the pyridine diamide complexes were much broader than that of the normal metallocene catalysts.

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