Reversible On/Off Switching of Lactide Cyclopolymerization with a Redox-Active Formazanate Ligand

ACS Catal. 2022 Apr 1;12(7):4125-4130. doi: 10.1021/acscatal.1c05689. Epub 2022 Mar 21.

ABSTRACT

Redox-switching of a formazanate zinc catalyst in ring-opening polymerization (ROP) of lactide is described. Using a redox-active ligand bound to an inert metal ion (Zn2+) allows modulation of the catalytic activity by reversible reduction/oxidation chemistry at a purely organic fragment. A combination of kinetic and spectroscopic studies, together with mass spectrometry of the catalysis mixture, provides insight in the nature of the active species and the initiation of lactide ring-opening polymerization. The mechanistic data highlight the key role of the redox-active ligand and provide a rationale for the formation of cyclic polymer.

PMID:35391903 | PMC:PMC8981207 | DOI:10.1021/acscatal.1c05689

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