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Issue 2, 2018
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Synthesis and structural characterization of zirconium complexes supported by tridentate pyrrolide-imino ligands with pendant N-, O- and S-donor groups and their application in ethylene polymerization

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Abstract

Zirconium complexes {L}ZrClx(THF)n [L = 2-(C4H3N-2′-CH[double bond, length as m-dash]N)C2H4NHPh, x = 3, n = 1, 2a; L = 2-(C4H3N-2′-CH[double bond, length as m-dash]N)C6H4-2-OPh, x = 3, n = 0, 2b; L = 2-(C4H3N-2′-CH[double bond, length as m-dash]N)C6H4-2-SPh, x = 3, n = 1, 2c; L = 2-(C4H3N-2′-CH[double bond, length as m-dash]N)CH2C6H4-2-OMe, x = 3, n = 0, 2d; L = 2-(C4H3N-2′-CH[double bond, length as m-dash]N)C2H4NPh, x = 2, n = 0, 4a] were prepared and characterized by elemental analysis, NMR spectroscopy, and by X-ray crystallography for 2a and 4a. In the solid state, 2a and 4a are monomeric with the pyrrolide-imino-amine adopting a mer-configuration. Upon activation with methylaluminoxane (MAO), all Zr(IV) precatalysts were active in ethylene polymerization and exhibited high thermal stability operating effectively at 100 °C with activities up to 453 kg(PE) mol[Zr]−1 h−1. The high-density polyethylenes produced are strictly linear with melting temperatures in the range of 134–136 °C, and crystallinities varying from 56% to 70%.

Graphical abstract: Synthesis and structural characterization of zirconium complexes supported by tridentate pyrrolide-imino ligands with pendant N-, O- and S-donor groups and their application in ethylene polymerization

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Publication details

The article was received on 21 Oct 2017, accepted on 17 Dec 2017 and first published on 18 Dec 2017


Article type: Paper
DOI: 10.1039/C7NJ04074A
Citation: New J. Chem., 2018,42, 1477-1483
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    Synthesis and structural characterization of zirconium complexes supported by tridentate pyrrolide-imino ligands with pendant N-, O- and S-donor groups and their application in ethylene polymerization

    A. C. Pinheiro, S. M. da Silva, T. Roisnel, E. Kirillov, J.-F. Carpentier and O. L. Casagrande, New J. Chem., 2018, 42, 1477
    DOI: 10.1039/C7NJ04074A

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