Highly linear polyethylenes tailored with 2,6-bis1-(p-dibenzo-cycloheptylarylimino)ethylpyridylcobalt dichlorides

Guo Liwei; Zada Muhammad; Zhang WenjuanVignesh ArumugamZhu DongzhiMa YanpingLiang TonglingSun Wen-Hua

首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Highly linear polyethylenes tailored with 2,6-bis1-(p-dibenzo-cycloheptylarylimino)ethylpyridylcobalt dichlorides

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Highly linear polyethylenes tailored with 2,6-bis1-(p-dibenzo-cycloheptylarylimino)ethylpyridylcobalt dichlorides

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A novel family of 2,6-bis1-(p-dibenzocycloheptylarylimino)ethylpyridylcobalt dichlorides Co1-Co4 were synthesized and fully characterized by FT-IR, H-1 NMR, and elemental analysis as well as X-ray diffraction analysis. The H-1 NMR spectra of these paramagnetic cobalt complexes Co1-Co3 showed similar spectra with one set of signals, while Co4 possessed two sets of signals due to the different conformations caused by different substituents on the ortho-position of the N-aryl group. Crystal structures of Co1, Co2 and Co4 revealed similar square-pyrimidal geometry around the cobalt ion, in which two dibenzocycloheptyl groups adapted as cis-conformers, whereas Co3 possessed bistrigonal geometry and the two dibenzocycloheptyl groups were adapted as trans-conformers. On activation with methylaluminoxane (MAO) or modified MAO (MMAO), all these cobalt complexes displayed high catalytic activities towards ethylene polymerization (up to 1.21 x 10(7) g (PE) mol(-1) (Co) h(-1)) and produced polyethylenes with narrow molecular distributions (PDI approximate to 2.0). Co3 bearing bulkier isopropyl substituents on the ortho-position gave much higher molecular weight of resultant polyethylene than the other cobalt complexes reported herein. The microstructure analysis of the PEs demonstrated that they are highly linear and contain a vinyl end group as the major group and saturated methyl as the minor group, in which the content of the unsaturated polymer chain relied on the ortho-substituent of the N-aryl group.

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《Dalton transactions: An international journal of inorganic chemistry》 |2019年第17期|5604-5613|共10页
作者
Guo Liwei; Zada Muhammad; Zhang WenjuanVignesh ArumugamZhu DongzhiMa YanpingLiang TonglingSun Wen-Hua;
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Chinese Acad Sci, Key Lab Engn Plast, Inst Chem, Beijing 100190, Peoples R China;

Beijing Inst Fash Technol, Sch Mat Sci & Engn, Beijing Engn Res Ctr Text Nanofiber, Beijing Key Lab Clothing Mat R&D & Assessment, Beijing 100029, Peoples R China;

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正文语种英语
中图分类化学;无机化学;
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1. ChemInform Abstract: Manganese(II) Complexes Containing the Tridentate Ligands 2,6‐Bis(1‐( phenylimino)ethyl)pyridine, L1, or 2,6‐Bis(1‐(4‐methoxyphenylimino) ethyl)pyridine, L2. The Molecular Structures of Five‐Coordinate ( MnBr2L1) and the Zinc Analogue (ZnCl2L1). [J] . D. A. EDWARDS, M. F. MAHON, W. R. MARTINK. C. MOLLOYP. E. FANWICKR. A. WALTON Chem Inform . 1991,第6期

机译：ChemInform Abstract: Manganese(II) Complexes Containing the Tridentate Ligands 2,6‐Bis(1‐( phenylimino)ethyl)pyridine, L1, or 2,6‐Bis(1‐(4‐methoxyphenylimino) ethyl)pyridine, L2. The Molecular Structures of Five‐Coordinate ( MnBr2L1) and the Zinc Analogue (ZnCl2L1).
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机译：Bis(Pyrazolyl)Pyridine Late Transition Metal Complexes as Single-Site Catalysts for Ethylene Polymerization to Highly Linear Polyethylene
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机译：Di-mu-hydroxo-bis((bis(2-(2-pyridyl)ethyl)amine-kappa 3N)copper(II)) dichloride hexahydrate.
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Highly linear polyethylenes tailored with 2,6-bis1-(p-dibenzo-cycloheptylarylimino)ethylpyridylcobalt dichlorides

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