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Substituent Effects of Pyridyl-methylene Cyclopentadienyl Rare-earth Metal Complexes on Styrene Polymerization

  • Zhen Zhang
  • Zhong-Yi Cai
  • Yu-Peng Pan
  • Yan-Li DouEmail author
  • Shi-Hui Li
  • Dong-Mei Cui
Article
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Abstract

Salt metathesis reactions between pyridyl-methylene-cyclopentadienyl lithium salt and LnCl3 followed by the addition of two equivalents of LiCH2SiMe3 afforded a series of constrained-geometry-configuration rare-earth metal bis(alkyl) complexes (Cp′CH2- Py)Ln(CH2SiMe3)2(THF)n (Py = C5H4N, Cp′ = C5H4 (Cp), Ln = Sc, n = 0 (1); Cp′ = C9H6 (Ind), Ln = Sc, n = 0 (2); Cp′ = 3-Me3Si-C9H5 (3-Me3Si-Ind), Ln = Sc, n = 0 (3a), Ln = Lu (3b), Y (3c), n = 1; Cp′ = 2,7-(tBu)2C13H8 (2,7-(tBu)2-Flu), Ln = Sc (4a), n = 0, Ln = Lu (4b), Y (4c), n = 1) in moderate to good yields, which were characterized by NMR spectroscopy and single-crystal X-ray diffraction (for complex 3a). In the presence of [Ph3C][B(C6F5)4] and AliBu3, these complexes displayed different performances towards styrene polymerization. Rare-earth metal bis(alkyl) precursors bearing Cp, Ind, and 3-Me3Si-Ind segments exhibited very low catalytic activity to afford syndiotactic polystyrene. All electron-donating tBu substituted complexes 4a, 4b, and 4c showed very high activity and perfect syndiotactivity (rrrr > 99%), producing high molecular weight polystyrene (up to 54.1 × 104) with relatively narrow molecular distribution (PDI = 1.28−2.49).

Keywords

Polystyrene Syndiotactic Rare-earth metal Constrained-geometry configuration 

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Notes

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51773193 and 21634007), department of science and technology of Jilin province (No. 20180101171JC), and the “973” project (No. 2015CB654702).

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Substituent Effects of Pyridyl-methylene Cyclopentadienyl Rare-earth Metal Complexes on Styrene Polymerization

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Copyright information

© Chinese Chemical Society, Institute of Chemistry (CAS) and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Zhen Zhang
    • 1
  • Zhong-Yi Cai
    • 1
  • Yu-Peng Pan
    • 2
  • Yan-Li Dou
    • 1
    Email author
  • Shi-Hui Li
    • 2
  • Dong-Mei Cui
    • 2
  1. 1.Key Laboratory of Automobile Materials of Ministry of Education, Department of Materials Science and EngineeringJilin UniversityChangchunChina
  2. 2.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunChina

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