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

Folkert de Vries, Edwin Otten*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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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.

Original languageEnglish
Pages (from-to)4125-4130
Number of pages6
JournalACS Catalysis
Issue number7
Publication statusPublished - 1-Apr-2022


  • catalysis
  • polymerization
  • cyclic polylactide
  • redox-switching
  • formazanate
  • redox-active ligand

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