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Bimetallic aluminum complexes supported by bis(salicylaldimine) ligand: Synthesis, characterization and ring-opening polymerization of lactide

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Abstract

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 Mns, 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 situ1H-NMR experiments of Al complexes with BnOH.

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Acknowledgments

This work was 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).

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Authors and Affiliations

  1. 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

    Tong Shi, Quan-De Zheng, Shao-Feng Liu & Zhi-Bo Li

  2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620, China

    Wei-Wei Zuo

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  1. Tong Shi
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  2. Quan-De Zheng
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  4. Shao-Feng Liu
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Correspondence to Shao-Feng Liu or Zhi-Bo Li.

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Invited paper for special issue of “Metal-Catalyzed Polymerization”

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10118_2018_2039_MOESM1_ESM.pdf

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

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Shi, T., Zheng, QD., Zuo, WW. et al. Bimetallic aluminum complexes supported by bis(salicylaldimine) ligand: Synthesis, characterization and ring-opening polymerization of lactide. Chin J Polym Sci 36, 149–156 (2018). https://doi.org/10.1007/s10118-018-2039-5

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