Simple Zn(ii) complexes for the production and degradation of polyesters

Jack Stewart, Martin Fuchs, Jack Payne, Oli Driscoll, Gabrielle Kociok-Kohn, Benjamin Ward, Sonja Herres-Pawlis, Matthew Jones

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12 Citations (SciVal)


Nine new complexes based on thioether appended iminophenolate (ONS) ligands have been prepared and fully characterized in solution by NMR spectroscopy. Solid-state structures were also obtained for seven complexes. In solution, all complexes were monomeric. The complexes were highly active for the polymerization of purified rac-lactide ([M] : [Zn] : [BnOH] = 10 000 : 1 : 30 at 180 °C) reaching TOF values up to 250 000 h−1. The kinetics of the polymerization have been probed by in situ Raman spectroscopy. The rate of reaction was dramatically reduced using technical grade rac-lactide with increased initiator loading. To move towards a circular economy, it is vital that catalysts are developed to facilitate chemical recycling of commodity and emerging polymeric materials. In this vein, the complexes have been assessed for their ability to break down poly(lactic acid) and poly(ethylene terephthalate). The results from both the polymerization and degradation reactions are discussed in terms of ligand functionality.
Original languageEnglish
Pages (from-to)1416-1424
Number of pages9
JournalRSC Advances
Issue number3
Early online date7 Jan 2022
Publication statusPublished - 7 Jan 2022

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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