Organoactinides in the polymerization of ethylene: Is TIBA a better cocatalyst than MAO?

Elena Domeshek, Rami J. Batrice, Sinai Aharonovich, Boris Tumanskii, Mark Botoshansky, Moris S. Eisen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The synthesis of two pyridylamidinate bis(N,N'-bis(trimethylsilyl)-2- pyridylamidinate)An(μ-Cl)2Li(TMEDA) (An = U (1), Th (2)) complexes is presented. For complex 1 the solid state X-ray structures were studied and compared to that of complex 2. The organoactinide complexes were studied as pre-catalysts in the polymerization of ethylene when activated by methylalumoxane (MAO). The catalytic activity was improved using a mixture of trityl tetrakispentafluorophenylborate (TTPB) and a small amount of methylalumoxane (MAO) as cocatalysts, and was amazingly improved, providing the greatest activity, using only triisobutyl aluminum (TIBA). We present a combination of ESR, C60 radical trapping, and MALDI-TOF studies describing the formation of the single-site active species, capturing some unique features of the complexes and shedding light on the polymerization mechanism.

Original languageEnglish
Pages (from-to)9069-9078
Number of pages10
JournalDalton Transactions
Volume42
Issue number25
DOIs
StatePublished - 7 Jul 2013
Externally publishedYes

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