Interaction of Neutral Donors with Methylaluminoxane

12 February 2019, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

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.

Keywords

Methylaluminoxane
Activator
Cocatalyst
Mass Spectrometry
Homogeneous Catalysis
DFT calculations
electrospray ionization

Supplementary materials

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MAO donor paper supporting info McIndoe
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MAO donor paper08022019 McIndoe
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