The strategy of catalyst remote-site modification has the potential ability to modulate catalytic behaviour that was always ignored in the coordination-insertion olefin polymerization. Utilizing this strategy in this contribution, we designed a series of remote site-modified diimine nickel catalysts with different substitutes. These complexes were investigated in the chain-walking polymerization of ethylene and 1-octene. The investigation of these complexes was conducted in the chain-walking polymerization of ethylene and 1-octene. The remote site modified nickel catalyst in this work demonstrated higher catalytic activity and thermal stability compared to the classical counterpart without modification. Especially, complex produced polyolefin with the largest molecular weight (up to 20.6 × 10 g mol). The introduction of the remote substitute could influence the steric hindrance and electronic effects, enabling to modulate the olefin polymerization process efficiently. The research of the remote-site modified catalyst designing provides another strategy in olefin polymerization and also may inspire more application in other metal-catalysis areas.

中文翻译：

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通过远程位点修饰调控α-二亚胺镍催化烯烃聚合

催化剂远程位点改性策略具有调节催化行为的潜在能力，而这在配位插入烯烃聚合中一直被忽视。在本论文中利用这一策略，我们设计了一系列具有不同替代品的远程位点改性二亚胺镍催化剂。在乙烯和 1-辛烯的链步行聚合中研究了这些配合物。这些配合物的研究是在乙烯和 1-辛烯的链步行聚合中进行的。与未经修饰的经典对应物相比，本工作中的远程位点修饰镍催化剂表现出更高的催化活性和热稳定性。特别是，复合生产的聚烯烃具有最大的分子量（高达20.6×10 g mol）。远程取代物的引入可以影响空间位阻和电子效应，从而能够有效地调节烯烃聚合过程。远程改性催化剂设计的研究为烯烃聚合提供了另一种策略，也可能激发在其他金属催化领域的更多应用。