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Issue 38, 2018
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Chromium complexes supported by the bidentate PN ligands: synthesis, characterization and application for ethylene polymerization

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Abstract

Chromium-based complexes are among the most important catalysts in the field of ethylene polymerization and oligomerization. Heterogeneous Cr Phillips catalysts account for more than one-third of the commercialized high density polyethylene (HDPE). In this contribution, chromium complexes, LCrCl3 (Cr1–Cr4: L = 2,6-R1-4-R2-C6H2-N[double bond, length as m-dash]CH-C6H4-2-PPh2; Cr1: R1 = H, R2 = H; Cr2: R1 = Me, R2 = H; Cr3: R1 = iPr, R2 = H; Cr4: R1 = Ph2CH, R2 = iPr), have been synthesized and characterized by elemental analysis, ESI and IR spectroscopy. The molecular structures of Cr3 and Cr4 are defined by X-ray diffraction, revealing a distorted octahedral geometry around the chromium center in both structures. In the presence of an aluminum cocatalyst, complexes Cr1–Cr4 show moderate to high activities toward ethylene polymerization. The nature of the catalysts and various reaction conditions, such as the nature and the amount of cocatalyst, reaction time and temperature, are investigated in detail. The results show that the title complexes have good thermal stability and the substituents on the ligands significantly affect the catalytic properties. Particularly, complex Cr4 can produce HDPE with a high molecular weight up to 68.3 × 104 g mol−1 due to the suppression of the chain transfer/termination by the introduction of bulky Ph2CH groups.

Graphical abstract: Chromium complexes supported by the bidentate PN ligands: synthesis, characterization and application for ethylene polymerization

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Publication details

The article was received on 10 Jul 2018, accepted on 24 Aug 2018 and first published on 27 Aug 2018


Article type: Paper
DOI: 10.1039/C8DT02834F
Dalton Trans., 2018,47, 13459-13465

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    Chromium complexes supported by the bidentate PN ligands: synthesis, characterization and application for ethylene polymerization

    Q. Zheng, D. Zheng, B. Han, S. Liu and Z. Li, Dalton Trans., 2018, 47, 13459
    DOI: 10.1039/C8DT02834F

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