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Ethylene Polymerization Catalyzed by Pyrene-Tagged Iron Complexes: The Positive Effect of π-Conjugation and Immobilization on Multiwalled Carbon Nanotubes

Authors

  • Liping Zhang,

    1. Laboratoire de Chimie de Coordination UPR CNRS 8241 composante ENSIACET, Université de Toulouse, 4 allée Emile Monso-CS 44362, 31030 Toulouse Cedex 4 (France), Fax: (+33) 534323596
    2. Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
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  • Dr. Wenjuan Zhang,

    1. Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
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  • Prof. Philippe Serp,

    1. Laboratoire de Chimie de Coordination UPR CNRS 8241 composante ENSIACET, Université de Toulouse, 4 allée Emile Monso-CS 44362, 31030 Toulouse Cedex 4 (France), Fax: (+33) 534323596
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  • Prof. Wen-Hua Sun,

    Corresponding author
    1. Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)
    • Wen-Hua Sun, Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)===

      Jérôme Durand, Laboratoire de Chimie de Coordination UPR CNRS 8241 composante ENSIACET, Université de Toulouse, 4 allée Emile Monso-CS 44362, 31030 Toulouse Cedex 4 (France), Fax: (+33) 534323596===

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  • Dr. Jérôme Durand

    Corresponding author
    1. Laboratoire de Chimie de Coordination UPR CNRS 8241 composante ENSIACET, Université de Toulouse, 4 allée Emile Monso-CS 44362, 31030 Toulouse Cedex 4 (France), Fax: (+33) 534323596
    • Wen-Hua Sun, Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)===

      Jérôme Durand, Laboratoire de Chimie de Coordination UPR CNRS 8241 composante ENSIACET, Université de Toulouse, 4 allée Emile Monso-CS 44362, 31030 Toulouse Cedex 4 (France), Fax: (+33) 534323596===

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Abstract

2-[1-(2,6-Diisopropylphenylimino)ethyl]-6-[1-(pyren-1-ylimino)ethyl]pyridine (L1) and 2,6-bis[1-(pyren-1-ylimino)ethyl]pyridine (L2) were synthesized and used to prepare the corresponding Fe complexes Fe1 and Fe2 from FeCl2. All new compounds were characterized, and single-crystal XRD analysis of Fe1 was performed. The π-conjugated pyrenyl substituent enhanced the catalytic activity of the Fe complexes, which display high activity in ethylene polymerization up to 107 gPE molFe−1 h−1 (PE=polyethylene). These Fe complexes were easily immobilized on multiwalled carbon nanotubes (MWCNTs) through noncovalent π–π interactions. The supported precatalysts showed better ethylene polymerization activity than their homogeneous counterparts to produce well-dispersed MWCNT/PE composite materials.

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