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 - Archive ouverte HAL Access content directly
Journal Articles New Journal of Chemistry Year : 2018

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

Abstract

Zirconium complexes {L} ZrClx(THF)(n) [L = 2-(C4H3N-2'-CHQN) C2H4NHPh, x = 3, n = 1, 2a; L = 2-(C4H3N-2'-CHQN) C6H4-2-OPh, x = 3, n = 0, 2b; L = 2-(C4H3N-2'-CHQN) C6H4-2-SPh, x = 3, n = 1, 2c; L = 2-(C4H3N-2'-CHQN) CH2C6H4-2-OMe, x = 3, n = 0, 2d; L = 2-(C4H3N-2'-CHQN) 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 degrees 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 degrees C, and crystallinities varying from 56% to 70%.
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Dates and versions

hal-01709533 , version 1 (26-04-2018)

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Cite

A. C. Pinheiro, S. M. da Silva, Thierry Roisnel, Evgeni Kirillov, Jean-François Carpentier, et al.. 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. New Journal of Chemistry, 2018, 42 (2), pp.1477-1483. ⟨10.1039/c7nj04074a⟩. ⟨hal-01709533⟩
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