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Cerium(III) Azolate Promoted CO2 Insertion.

Jonas Riedmaier1, Cäcilia Maichle-Mössmer1, Reiner Anwander1

  • 1Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, Tübingen 72076, Germany.

Inorganic Chemistry
|November 5, 2025
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Summary
This summary is machine-generated.

New cerium azolate complexes were synthesized and tested for carbon dioxide (CO2) reactivity. Some complexes readily insert CO2, forming novel structures, while others show limited reactivity, impacting potential catalytic applications.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Cerium complexes offer unique electronic properties for chemical transformations.
  • Azolates are versatile ligands in coordination chemistry.
  • CO2 utilization remains a critical challenge in sustainable chemistry.

Purpose of the Study:

  • Synthesize novel sandwich cerium azolate complexes.
  • Investigate the carboxophilicity (CO2 reactivity) of these complexes.
  • Evaluate their potential in CO2 cycloaddition catalysis.

Main Methods:

  • Synthesis via salt-metathesis and protonolysis protocols.
  • Characterization of cerium azolate complexes.
  • Probing CO2 insertion reactions and catalytic activity.

Main Results:

  • Exhaustive CO2 insertion observed in pyrazolate complexes, forming dimeric structures.
  • Steric and electronic factors influence CO2 insertion extent.
  • Triazolate and tetrazolate complexes show varied CO2 reactivity.
  • Catalytic activity in CO2 and propylene oxide cycloaddition was examined.

Conclusions:

  • Ligand design significantly impacts the CO2 reactivity of cerium azolates.
  • These complexes demonstrate potential as platforms for CO2 functionalization.
  • Further studies are warranted to optimize catalytic performance.