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Bimetallic Zinc Catalysts for Ring-Opening Copolymerization Processes.

Felipe de la Cruz-Martínez1, Marc Martínez de Sarasa Buchaca1, Javier Martínez1,2

  • 1Departamento de Quı́mica Inorgánica, Orgánica y Bioquı́mica-Centro de Innovación en Quı́mica Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologı́as Quı́micas, Universidad de Castilla-La Mancha, 13071-Ciudad Real, Spain.

Inorganic Chemistry
|May 27, 2020
PubMed
Summary

Novel bimetallic zinc acetate complexes catalyze ring-opening copolymerization of cyclohexene oxide and CO2, yielding poly(cyclohexene)carbonate. Complex 3 demonstrated high activity without a cocatalyst for both copolymerization and terpolymerization reactions.

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Area of Science:

  • Coordination Chemistry
  • Polymer Chemistry
  • Catalysis

Background:

  • Development of efficient catalysts for CO2 utilization is crucial for sustainable chemistry.
  • Ring-opening polymerization offers a pathway to valuable carbonate and polyester materials.

Purpose of the Study:

  • To synthesize novel bimetallic zinc acetate complexes supported by heteroscorpionate ligands.
  • To investigate their catalytic activity in the copolymerization of cyclohexene oxide and CO2.
  • To explore their application in the terpolymerization of cyclohexene oxide, phthalic anhydride, and CO2.

Main Methods:

  • Synthesis of dinuclear zinc complexes via reaction of heteroscorpionate ligand precursors with zinc acetate.
  • Structural characterization using spectroscopic methods and X-ray diffraction analysis.
  • Catalytic screening for ring-opening copolymerization and terpolymerization reactions.

Main Results:

  • Three novel dinuclear zinc acetate complexes (1-3) were synthesized in excellent yields.
  • Complex 3 exhibited high catalytic activity in the copolymerization of cyclohexene oxide and CO2 to form poly(cyclohexene)carbonate, even without a cocatalyst.
  • The terpolymerization of cyclohexene oxide, phthalic anhydride, and CO2 was successfully achieved using complex 3 and 4-dimethylaminopyridine.

Conclusions:

  • The developed bimetallic zinc complexes are effective catalysts for CO2 utilization in polymerization reactions.
  • Complex 3 represents a highly active catalyst for producing poly(cyclohexene)carbonate and polyester-polycarbonate materials.
  • This work contributes to the advancement of sustainable polymer synthesis using CO2 as a feedstock.