Preparation and structure of an enantiomeric water-bridged dinuclear indium complex containing two homochiral N atoms and its performance as an initiator in polymerization of rac-lactide

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Abstract

A novel dinuclear indium complex (1) containing a sole water bridge was prepared from the reaction of InCl3 with an unsymmetric N2O2-ligand and the molecular structure of the complex 1 was determined. The X-ray crystallography data show that the dinuclear complex possesses two homochiral N atoms, namely, N(R)N(R) and N(S)N(S) enantiomers. Complex 1 was used as initiator for ring-opening polymerization of rac-lactide, giving heterotactic-rich polylactide (Pr = 0.63–0.69) with narrow polydispersities (1.13–1.31).

Graphical abstract

An enantiomeric water-bridged dinuclear indium complex (1) containing two homochiral N atoms was prepared and structurally characterized. The racemate of 1 is catalytically active for the ring-opening polymerization of rac-LA, giving heterotactic-rich polylactide with narrow polydispersities.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant no. 20973032), the Program for Changjiang Scholars and Innovative Research Team in University (IRT0711), and the K & A Wallenberg Foundation of Sweden.

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