Citation: Tong Shi, Quan-De Zheng, Wei-Wei Zuo, Shao-Feng Liu, Zhi-Bo Li. Bimetallic Aluminum Complexes Supported by Bis(salicylaldimine) Ligand: Synthesis, Characterization and Ring-opening Polymerization of Lactide[J]. Chinese Journal of Polymer Science, ;2018, 36(2): 149-156. doi: 10.1007/s10118-018-2039-5 shu

Bimetallic Aluminum Complexes Supported by Bis(salicylaldimine) Ligand: Synthesis, Characterization and Ring-opening Polymerization of Lactide

a.
Key Laboratory of Biobased Polymer Materials, Shandong Provincial Education Department; School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
b.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China

Corresponding author: Shao-Feng Liu, shaofengliu@qust.edu.cn Zhi-Bo Li, zbli@qust.edu.cn
Received Date: 10 August 2017
Accepted Date: 8 September 2017
Available Online: 1 November 2017

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-Al₂) and far apart (anti-Al₂), respectively. The distance between two Al centers in syn-Al₂ was defined by X-ray diffraction as 6.665 Å, which is far shorter than that in anti-Al₂. In the presence of stoichiometrical BnOH, syn-Al₂ and anti-Al₂ were both efficient for ring-opening polymerization (ROP) of rac-LA with the former being more active. In the presence of excess BnOH, syn-Al₂ showed an efficient and immortal feature, consistent with high conversions, matched M_ns, narrow molecular weight distributions and end group fidelity, while anti-Al₂ 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 BnOH.
- Bimetallic catalyst,
- Aluminum complex,
- Ring-opening polymerization,
- Immortal polymerization,
- Polyester
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