Investigating the Effects of <italic style="font-style: italic">Para</italic>-methoxy Substitution in Sterically Enhanced Unsymmetrical Bis(arylimino)pyridine-cobalt Ethylene Polymerization Catalysts

Yi Yan; Shi-Fang Yuan; Ming Liu; Gregory A. Solan; Yan-Ping Ma; Tong-Ling Liang; Wen-Hua Sun

doi:10.1007/s10118-022-2670-z

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Investigating the Effects of Para-methoxy Substitution in Sterically Enhanced Unsymmetrical Bis(arylimino)pyridine-cobalt Ethylene Polymerization Catalysts

RESEARCH ARTICLE | Updated：2022-03-23

- Investigating the Effects of Para-methoxy Substitution in Sterically Enhanced Unsymmetrical Bis(arylimino)pyridine-cobalt Ethylene Polymerization Catalysts
- Investigating the Effects of Para-methoxy Substitution in Sterically Enhanced Unsymmetrical Bis(arylimino)pyridine-cobalt Ethylene Polymerization Catalysts
- Chinese Journal of Polymer Science 2022年40卷第3期页码：266-279
- Affiliations：
  
  a.Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, China
  b.Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing 100190, China
  c.Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK
  d.State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Author bio：
  
  yuansf@sxu.edu.cn (S.F.Y.)
  gas8@leicester.ac.uk (G.A.S.)
  whsun@iccas.ac.cn (W.H.S.)
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (No. 21871275). G.A.S. thanks the Chinese Academy of Sciences for a President's International Fellowship for Visiting Scientists.
- DOI：10.1007/s10118-022-2670-z
  中图分类号：
- 收稿：2021-10-25，
  
  修回：2021-11-22，
  
  录用：2021-11-23，
  
  网络首发：2022-01-11，
  
  纸质出版：2022-03-01
- Accepted：
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Yan, Y.; Yuan, S. F.; Liu, M.; Solan, G. A.; Ma, Y. P.; Liang, T. L.; Sun, W. H. Investigating the effects of para-methoxy substitution in sterically enhanced unsymmetrical bis(arylimino)pyridine-cobalt ethylene polymerization catalysts. Chinese J. Polym. Sci. 2022, 40, 266–279

Yi Yan, Shi-Fang Yuan, Ming Liu, et al. Investigating the Effects of Para-methoxy Substitution in Sterically Enhanced Unsymmetrical Bis(arylimino)pyridine-cobalt Ethylene Polymerization Catalysts[J]. Chinese Journal of Polymer Science, 2022, 40(3): 266-279. DOI: 10.1007/s10118-022-2670-z.
Yan, Y.; Yuan, S. F.; Liu, M.; Solan, G. A.; Ma, Y. P.; Liang, T. L.; Sun, W. H. Investigating the effects of para-methoxy substitution in sterically enhanced unsymmetrical bis(arylimino)pyridine-cobalt ethylene polymerization catalysts. Chinese J. Polym. Sci. 2022, 40, 266–279 DOI： 10.1007/s10118-022-2670-z.

Yi Yan, Shi-Fang Yuan, Ming Liu, et al. Investigating the Effects of Para-methoxy Substitution in Sterically Enhanced Unsymmetrical Bis(arylimino)pyridine-cobalt Ethylene Polymerization Catalysts[J]. Chinese Journal of Polymer Science, 2022, 40(3): 266-279. DOI: 10.1007/s10118-022-2670-z. DOI：

摘要

Abstract

A group of five bis(arylimino)pyridine-cobalt(II) chloride complexes

[2-{(2

6-(Ph

CH)

-4-MeOC

)N＝CMe}-6-(ArN＝CMe)C

N]CoCl

(Ar = 2

6-Me

Co1

6-Et

Co2

6-iPr

Co3

6-Me

Co4

6-Et

-4-MeC

Co5

)

each containing one

-4-methoxy-2

6-dibenzhydrylphenyl group and one smaller sterically/electronically variable

-aryl group

have been synthesized in good yield (

71%) from the corresponding neutral terdentate nitrogen-donor precursor

–

. All complexes have been characterized by

H-NMR and FTIR spectroscopy with the former highlighting the paramagnetic nature of these cobaltous species and the unsymmetrical nature of the chelating ligand. The molecular structures of

Co3

and

Co4

emphasize the steric differences of the two inequivalent

-aryl groups and the distorted square pyramidal geometry about the metal centers. In the presence of MAO or MMAO

Co1

–

Co5

collectively displayed high activities for ethylene polymerization producing high molecular weight polyethylenes that

in general

exhibited narrow dispersities (

values: 2.12–4.07). Notably

the least sterically hindered

Co1

when activated with MAO was the most productive (6.92×10

·mol

−1

(Co)

·h

−1

) at an operating temperature of 60 ºC. Conversely

the most sterically hindered

Co3

/MMAO produced the highest molecular weight polyethylene (

=6.29×10

g·mol

−1

). All the polymers displayed high linearity as demonstrated by their melting temperatures (

130 °C) and their

H- and

C-NMR spectra. By comparison of

Co1

with its

para

-methyl

-chloro and -nitro counterparts

the presence of the

para

-methoxy substituent showed the most noticeable effect of enhancing the thermal stability of the catalyst.

关键词

Keywords

references

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DOI：10.1007/s10118-022-2670-z

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