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Keywords:

  • cerium;
  • polymers;
  • ring-opening polymerization;
  • reduction;
  • oxidation
Thumbnail image of graphical abstract

The old switcheroo! The ring-opening polymerization activity towards meso-lactide significantly differs when cerium complexes with two bis(phenolate) ligands (OSSO type) change their oxidation state from +4 to +3. This switch can be performed in situ by chemical reduction or oxidation of the catalyst. The redox switching is possible up to three times in a row. PLA=polylactide.