A Comparative Study on Dinuclear and Mononuclear Aluminum Methyl Complexes Bearing Piperidyl-Phenolato Ligands in ROP of Epoxides.
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.
Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, People's Republic of China.|Department of Chemistry and Biological Engineering, Hunan University of Science and Engineering , Yongzhou 425199, Hunan, People's Republic of China.
Wenyi
W
Li
Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, People's Republic of China.
Hao
H
Ouyang
Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, People's Republic of China.
Lijuan
L
Chen
Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, People's Republic of China.
Dan
D
Yuan
Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, People's Republic of China.
Yong
Y
Zhang
Key Laboratory of Organic Synthesis of Jiangsu Province and Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering & Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, People's Republic of China.
Yingming
Y
Yao