Cerium(III) Azolate Promoted CO₂ Insertion

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.