A Comparative Study on Dinuclear and Mononuclear Aluminum Methyl Complexes Bearing Piperidyl–Phenolato Ligands in ROP of Epoxides

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• 作者：Wenyi Li ; Hao Ouyang ; Lijuan Chen ; Dan Yuan ; Yong Zhang ; Yingming Yao
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：July 5, 2016
• 年：2016
• 卷：55
• 期：13
• 页码：6520-6524
• 全文大小：339K
• 年卷期：0
• ISSN：1520-510X

文摘

Dinuclear aluminum methyl complexes stabilized by piperidyl–phenolato ligands were prepared and characterized. The ring-opening polymerizations of cyclohexene oxide (CHO) and propylene oxide (PO) initiated by dinuclear complexes and mononuclear analogues were investigated and compared. Enhanced activity of dinuclear complexes compared to that of mononuclear analogues in both the ring-opening polymerization of CHO and PO proves the synergistic interaction of two Al centers in the former. End-group analysis of oligomers by MALDI-TOF mass spectrometry confirms the role of methyl groups as initiating groups. A bimetallic mechanism is proposed, in which the cooperation of two Al centers are involved in polymerization processes.