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Issue 14, 2018
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NMR spectroscopic identification of Ni(II) species formed upon activation of (α-diimine)NiBr2 polymerization catalysts with MAO and MMAO

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Abstract

The nature of Ni(II) species formed upon the activation of the Brookhart's α-diimine polymerization pre-catalyst LNiBr2 with MAO and MMAO (L = 1,4-bis-2,4,6-dimethylphenyl-2,3-dimethyl-1,4-diazabuta-1,3-diene) has been established using 1H and 13C NMR spectroscopy. The heterobinuclear ion pair [LNiII(μ-Me)2AlMe2]+[MeMAO] is observed at the initial stage of the reaction of LNiBr2 with MAO at −40 °C, whereas the ion pair [LNiIItBu]+[MeMMAO] predominates at the initial stage of the reaction of LNiBr2 with MMAO under the same conditions. At higher temperatures, both ion pairs transform into a Ni(I) species displaying an axially anisotropic EPR spectrum (g = 2.21, g = 2.06, A = 1.06 mT).

Graphical abstract: NMR spectroscopic identification of Ni(ii) species formed upon activation of (α-diimine)NiBr2 polymerization catalysts with MAO and MMAO

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Publication details

The article was received on 05 Feb 2018, accepted on 06 Mar 2018 and first published on 07 Mar 2018


Article type: Paper
DOI: 10.1039/C8DT00483H
Citation: Dalton Trans., 2018,47, 4968-4974
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    NMR spectroscopic identification of Ni(II) species formed upon activation of (α-diimine)NiBr2 polymerization catalysts with MAO and MMAO

    I. E. Soshnikov, N. V. Semikolenova, K. P. Bryliakov, A. A. Antonov, V. A. Zakharov and E. P. Talsi, Dalton Trans., 2018, 47, 4968
    DOI: 10.1039/C8DT00483H

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