Citation: Bi-Yun SU, Ting-Yu YAN, Xiao-Teng LI, Dan-Dan PAN, Paison FAIDA, Li-Qin DING. Influence of the Substituents on Imino-aryl Ring of Mono(imino)pyrrole-Ni^Ⅱ Complexes to Their Ethylene Polymerization Catalytic Performance[J]. Chinese Journal of Structural Chemistry, ;2020, 39(6): 1093-1102. doi: 10.14102/j.cnki.0254-5861.2011-2548 shu

Influence of the Substituents on Imino-aryl Ring of Mono(imino)pyrrole-Ni^Ⅱ Complexes to Their Ethylene Polymerization Catalytic Performance

a.
College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, China
b.
PetroChina Hohhot Petrochemical Company, 010070, China

Corresponding author: Bi-Yun SU, subiyun@xsyu.edu.cn
Received Date: 25 June 2019
Accepted Date: 14 November 2019

Fund Project: the National Natural Science Foundation of China 51674200the Science and Technology Research Program of Shaanxi Province 2019JM-421the Science and Technology Research Program of Shaanxi Province 2018JM2035

Figures(4)

In order to study the influence of substituents on imino-aryl rings of mono(imino)pyrrole-transition metal complexes to their ethylene polymerization performance, a series of mono(imine)pyrroles (L1-L3) were synthesized by microwave irradiation from 2-acetylpyrrole and a series of 2, 6-position disubstituted anilines (substituent: H, Me, Et). A simplified synthetic method was introduced to prepare the corresponding nickel complexes NiL₂ (1~3) with direct condensation of mono(imine)pyrrole ligands and nickel dichloride. All the compounds were fully characterized by ¹H NMR, IR, EA, MS, and X-ray crystal diffraction. Ligand L3 (C₁₆H₂₀N₂, M_r = 240.34) belongs to the triclinic system, space group P\begin{document}$ \overline 1 $\end{document}, with a = 7.9606(19), b = 9.028(2), c = 11.205(3) Å, the final R = 0.0606 and wR = 0.1875. Complex 3 (C₃₂H₃₈N₄Ni, M_r = 537.37) belongs to the monoclinic system, space group C2/c with a = 19.811(3), b = 11.262(2), c = 26.004(4) Å, the final R = 0.0388 and wR = 0.1020. The crystal structures indicated that all the Ni^Ⅱ complexes have similar tetra-coordinated geometries, in which the ligand chelated to the center nickel with a 2:1 molar ratio. Catalytic properties of the Ni^Ⅱ complexes for ethylene polymerization were systematically investigated, and the results showed a regular increase of catalytic activities with steric hindrance of the substituents on the imino-aryl ring of Ni^Ⅱ complexes.
- mono(imino)pyrrole ligand,
- Ni^Ⅱ complex,
- crystal structure,
- ethylene polymerization,
- catalytic performance
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Influence of the Substituents on Imino-aryl Ring of Mono(imino)pyrrole-NiⅡ Complexes to Their Ethylene Polymerization Catalytic Performance

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通讯作者: 陈斌, bchen63@163.com

Influence of the Substituents on Imino-aryl Ring of Mono(imino)pyrrole-Ni^Ⅱ Complexes to Their Ethylene Polymerization Catalytic Performance