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Interaction of Neutral Donors with Methylaluminoxane

preprint
submitted on 11.02.2019 and posted on 12.02.2019 by Harmen S. Zijlstra, Anuj Joshi, Mikko Linnolahti, Scott Collins, J Scott McIndoe

Methylaluminoxane (MAO) is a key activator for olefin polymerization catalysts, making its chemistry of ongoing interest. Neutral donors such as octamethyltrisiloxane (OMTS) are effective abstractors of the dimethylaluminum cation, [Me2Al]+, from methylaluminoxane (MAO), and this process can be readily investigated using electrospray ionization mass spectrometry (ESI-MS) in fluorobenzene (PhF) solution. Complementary studies employing 1D and 2D 1H NMR spectroscopic studies in bromobenzene-d5 solution provide details on the extent of ionization vs. donor-acceptor complex formation. DFT studies employing different neutral model precursors and mono- vs. bi-dentate donors shed light on possible mechanisms for ion-pair formation.

Funding

NSERC Strategic Project Grant #478998-15

History

Email Address of Submitting Author

mcindoe@uvic.ca

Institution

University of Victoria

Country

Canada

ORCID For Submitting Author

0000-0001-7073-5246

Declaration of Conflict of Interest

None

Version Notes

As submitted

Exports