The nature of nickel species formed upon the activation of α-diimine nickel(II) pre-catalyst with alkylaluminum sesquichlorides

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Abstract

The nature of nickel(II) species, formed upon the activation of α-diiminonickel pre-catalyst LNNiIIBr2 (LN = 1,2-Bis[(2,4,6-trimethylphenyl)imino]acenaphthene) with Al2Et3Cl3 and Al2Me3Cl3, has been studied using 1H and 2H NMR spectroscopy. The paramagnetic heterobinuclear ion pairs of the type [LNNiII(μ-Cl)2AlRCl]+[A] (where R = Et or Me, [A]- = counter anion) have been observed in the catalyst systems LNNiIIBr2/Al2Et3Cl3 and LNNiIIBr2/Al2Me3Cl3. At room temperature, both ion pairs gradually transform into EPR-active complexes of Ni(I). Their possible role in ethylene polymerization is discussed.

Original languageEnglish
Article number121063
Number of pages6
JournalJournal of Organometallic Chemistry
Volume907
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • EPR
  • Ethylene intermediates
  • Nickel
  • NMR
  • Polymerization
  • THERMAL-STABILITY
  • SUBSTITUENTS
  • CHAIN-WALKING POLYMERIZATION
  • ETHYLENE POLYMERIZATION BEHAVIOR
  • POLYETHYLENE
  • ELASTOMERS
  • COMPLEXES SYNTHESIS
  • OLEFINS
  • BROMIDE

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