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首页> 外文期刊>RSC Advances >Constrained formation of 2-(1-(arylimino)ethyl)-7-arylimino-6,6-dimethylcyclopentapyridines and their cobalt(II) chloride complexes: synthesis, characterization and ethylene polymerization
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Constrained formation of 2-(1-(arylimino)ethyl)-7-arylimino-6,6-dimethylcyclopentapyridines and their cobalt(II) chloride complexes: synthesis, characterization and ethylene polymerization

机译：2-（1-（芳基）乙基）-7-芳基-6,6-二甲基环戊吡啶及其氯化钴（II）配合物的形成受限：合成，表征和乙烯聚合

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摘要

A series of 2-(1-(arylimino)ethyl)-7-arylimino-6,6-dimethylcyclopentapyridine derivatives (L1-L5) was synthesized, and individually reacted with cobalt(II) chloride to form the corresponding cobalt chloride complexes (C1-C4). These compounds were characterized, and the single crystal X-ray diffraction for two representative cobalt complexes was carried out. The molecular structures indicate that 2,7-bis(arylimino)cyclopentapyridines act as tridentate ligands; however, one of the Co-N coordinative bonds is weak due to the spatial separation of nitrogen atoms. Upon activation with either MAO or MMAO, all cobalt complexes exhibit catalytic activities toward ethylene. Polymerization takes place in the presence of MAO with activities of approximately 10(4) g of PE per (mol of Co) per h, but oligomerization occurs in the presence of MMAO with the activities higher by one order of magnitude. The resultant products, either polyethylenes or oligomers, display high linearity. Relatively low activities observed for cobalt complexes discussed reflect the importance of the appropriate spatial arrangement of the three donor nitrogen atoms.
机译：合成了一系列2-（1-（芳基）乙基）-7-芳基-6,6-二甲基环戊吡啶衍生物（L1-L5），并分别与氯化钴（II）反应形成相应的氯化钴配合物（C1 -C4）。对这些化合物进行了表征，并对两种代表性的钴配合物进行了单晶X射线衍射。分子结构表明2,7-双（芳基）环戊吡啶为三齿配体。然而，由于氮原子的空间分隔，Co-N配位键之一较弱。在用MAO或MMAO活化后，所有钴配合物均表现出对乙烯的催化活性。聚合反应是在MAO存在下进行的，其活性约为h / h（每摩尔Co）约10（4）g PE，但在MMAO存在下则发生低聚，其活性高出一个数量级。所得产物，无论是聚乙烯还是低聚物，都显示出高线性。所讨论的钴配合物的相对较低活性反映了三个供体氮原子的适当空间排列的重要性。

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