Cyclometalated group 4 complexes supported by tridentate pyridine-2-phenolate-6-(σ-aryl) ligands : Catalysts for ethylene polymerization and comparisons with fluorinated analogues

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)4750-4759
Journal / PublicationJournal of Organometallic Chemistry
Volume692
Issue number21
Publication statusPublished - 1 Oct 2007

Abstract

An adaptable synthetic methodology for the tridentate dianionic pyridine-2-phenolate-6-aryl [O,N,C] ligand framework, comprising the aromatic σ-carbanion moiety as a chelating component, has been developed. A series of non-fluorinated group 4 bis(benzyl) complexes supported by [O,N,C] auxiliaries, with halogen and alkyl groups at the 'R1' position ortho to the metal-C(σ-aryl) bond, have been prepared by exploiting the cyclometalation of the ligand. All derivatives have been characterized by NMR spectroscopy, and the spectral features concerning the metal-bound diastereotopic methylene groups have been highlighted. The capabilities of these complexes as catalysts for olefin polymerization have been tested, and comparisons with the recently reported fluorine-containing Ti-[O,N,C] analogues and related Hf-[N,N,C] derivatives are discussed. The titanium catalysts, in conjunction with MAO, displayed moderate to high activities for ethylene polymerization (up to 200 g mmol-1 h-1). © 2007 Elsevier B.V. All rights reserved.

Research Area(s)

  • σ-Aryl ligand, Benzyl complexes, Cyclometalation, Olefin polymerization, Post-metallocenes

Citation Format(s)

Cyclometalated group 4 complexes supported by tridentate pyridine-2-phenolate-6-(σ-aryl) ligands : Catalysts for ethylene polymerization and comparisons with fluorinated analogues. / Tam, Ka-Ho; Lo, Jerry C.Y.; Guo, Zhengqing et al.

In: Journal of Organometallic Chemistry, Vol. 692, No. 21, 01.10.2007, p. 4750-4759.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review