Interaction of Neutral Donors with Methylaluminoxane
2019
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.
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