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《高分子科学(英文版)》 2018-02
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Bimetallic Aluminum Complexes Supported by Bis(salicylaldimine) Ligand: Synthesis, Characterization and Ring-opening Polymerization of Lactide

Tong Shi;Quan-De Zheng;Wei-Wei Zuo;Shao-Feng Liu;Zhi-Bo Li;Key Laboratory of Biobased Polymer Materials, Shandong Provincial Education Department;School of Polymer Science and Engineering, Qingdao University of Science and Technology;State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University;  
Two types of bifunctional bis(salicylaldimine) ligands(syn-L and anti-L) were designed and synthesized to support bimetallic aluminum complexes. Owing to the rigid anthracene skeleton, syn-L and anti-L successfully locked two Al centers in close proximity(syn-Al_2) and far apart(anti-Al_2), respectively. The distance between two Al centers in syn-Al_2 was defined by X-ray diffraction as 6.665 ?, which is far shorter than that in anti-Al_2. In the presence of stoichiometrical Bn OH, syn-Al_2 and anti-Al_2 were both efficient for ring-opening polymerization(ROP) of rac-LA with the former being more active. In the presence of excess Bn OH, syn-Al_2 showed an efficient and immortal feature, consistent with high conversions, matched Mns, narrow molecular weight distributions and end group fidelity, while anti-Al_2 had a much lower activity or even became entirely inactive due to rapid decomposition, indicated by in situ ~1H-NMR experiments of Al complexes with Bn OH.
【Fund】: financially supported by the National Natural Science Foundation of China (No. B040102);; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials (Donghua University) (No. LK1501);; Department of Science and Technology of Qingdao and Shandong Province (Nos. 159181jch and 2015GGX107015)
【CateGory Index】: O641.4
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