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题名: Raising the N-aryl fluoride content in unsymmetrical diaryliminoacenaphthylenes as a route to highly active nickel(II) catalysts in ethylene polymerization
作者: Wang, Xinxin1, 2, 3; Fan, Linlin1, 2, 3; Yuan, Yichun2, 3; Du, Shizhen2, 3; Sun, Yang2, 3; Solan, Gregory A.2, 3, 4; Guo, Cun-Yue1; Sun, Wen-Hua1, 2, 3
刊名: DALTON TRANSACTIONS
发表日期: 2016
卷: 45, 期:45, 页:18313-18323
收录类别: SCI
英文摘要: Five examples of selectively fluorinated unsymmetrical diiminoacenaphthylenes, 1-[2,6-{(4-FC6H4)(2)CH}(2)-4- FC6H4N]-2-(ArN) C2C10H6 (Ar = 2,6-Me2C6H3 L1, 2,6-Et2C6H3 L2, 2,6-iPr(2)C(6)H(3) L3, 2,4,6-Me3C6H2 L4, 2,6-E(t)2-4-MeC6H2 L5), have been synthesized and used to prepare their corresponding nickel(II) halide complexes, LNiBr2 (Ni1-Ni5) and LNiCl2 (Ni6-Ni10). Both H-1 and F-19 NMR spectroscopy techniques have been employed to characterize paramagnetic Ni1-Ni10; an inequivalent fluorine environment is a feature of the tetrahedral complexes in solution. Upon activation with relatively low ratios (ca. 600 equiv.) of ethylaluminum sesquichloride (Et3Al2Cl2, EASC), all the nickel complexes displayed high activities toward ethylene polymerization at 30 degrees C with precatalyst Ni4 the standout performer at 2.20 x 10(7) g of PE per mol of Ni per h, producing highly branched polyethylenes. In comparison with related diimino-acenaphthylene- nickel catalysts, these current systems, incorporating a high fluorine content on one N-aryl group, display superior productivity. In addition, the molecular structures of Ni2 and Ni4 are reported and the active catalyst is probed using 19F NMR spectroscopy.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35726
Appears in Collections:工程塑料实验室_期刊论文

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作者单位: 1.Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
4.Univ Leicester, Dept Chem, Univ Rd, Leicester LE1 7RH, Leics, England
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