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Amino acid complexes with tin as a new class of catalysts with high reactivity and low toxicity towards biocompatible aliphatic polyesters

Abstract

A series of complexes consisting of natural amino acids and tin (Sn(AA)2) prepared by conventional neutralization reactions were tested as a new class of cost-effective catalysts with high reactivity and low toxicity towards some biocompatible aliphatic polyesters. In our system, by using a simple catalyst and a benzyl alcohol (BnOH) initiator, biocompatible, and biodegradable aliphatic polyesters, such as poly(l-lactide), poly(ε-caprolactone), and poly(trimethylene carbonate), were well prepared. The results demonstrated that Sn(AA)2 catalysts, especially the phenylalanine-tin complex (Sn(L-Phe)2) (Mn, up to 194 kg/mol), were suitable for the synthesis of moderate and high-molecular weight poly(l-lactide), which exhibited good biocompatibility. Analysis of the backbone structure and end groups of low-molar-mass polymers by using MALDI-TOF mass spectra and 1H NMR spectroscopy suggested that the reaction proceeds by a dual activation mechanism. Given their low cost, simple preparation, high reactivity, and low toxicity, complexes consisting of natural amino acids and tin are promising for industrial-scale production of biocompatible aliphatic polyesters.

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Acknowledgements

This work was financially supported by the Fundamental Research Funds for the Central Universities (No. DUT19LAB27).

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Correspondence to Zhiyong Wei or Yang Li.

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He, M., Cheng, Y., Liang, Y. et al. Amino acid complexes with tin as a new class of catalysts with high reactivity and low toxicity towards biocompatible aliphatic polyesters. Polym J 52, 567–574 (2020). https://doi.org/10.1038/s41428-020-0314-0

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