Unusual synergetic effect of cocatalysts in the polymerization of propylene by a zirconium bis(benzamidinate) dimethyl complex

Victoria Volkis, Boris Tumanskii, Moris S. Eisen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The zirconium benzamidinate dimethyl complex [PhC(NSiMe3) 2]2Zr(Me)2 (1) was activated by a mixture of trityl tetrakispentafluorophenylborate (TTPB) and a small amount of methylalumoxane (MAO) (Zr:B:Al = 1:1:50), forming an extremely active catalytic system for the polymerization of olefins, producing high-density polyethylene and elastomeric polypropylene with a narrow MWD. This catalytic system rivals the activity of the best nonmetallocene systems and approaches the activities of the best metallocene complexes. Single active sites are obtained only after the addition of propylene. A plausible activation mechanism is proposed, which is corroborated by NMR, ESR spectroscopy, radical trapping on fullerene, and MALDI-TOF mass spectroscopy experiments.

Original languageEnglish
Pages (from-to)2722-2724
Number of pages3
JournalOrganometallics
Volume25
Issue number11
DOIs
StatePublished - 22 May 2006
Externally publishedYes

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