Self-assembly of binuclear/hexanuclear lanthanide complexes for functional catalysis

Area of Science:

• Coordination Chemistry
• Materials Science
• Catalysis

Background:

• N-heterocyclic carboxylic acids are versatile ligands in coordination chemistry.
• These ligands offer combined N and O donor atoms for metal coordination.
• Developing new ligands is crucial for advancing catalysis and materials science.

Purpose of the Study:

• Synthesize novel N-heterocyclic carboxylic acid ligands.
• Construct and characterize metal complexes with these ligands.
• Evaluate the catalytic potential of the synthesized complexes in key organic reactions.

Main Methods:

• Ligand synthesis and characterization.
• Crystallization and structural analysis of metal complexes (X-ray diffraction).
• Catalytic performance evaluation for cyanosilylation and CO2 cycloaddition reactions.

Main Results:

• Two new ligands, HL1 and HL2, were synthesized.
• Six metal complexes with diverse structures (binuclear and polyhedral clusters) were obtained.
• Complexes 1-6 exhibited moderate to high yields in catalytic reactions under mild conditions.
• Detailed mechanistic studies were performed on representative complexes (4 and 6).

Conclusions:

• The synthesized metal complexes show excellent catalytic activity.
• These complexes are promising candidates for heterogeneous catalysis in CO2 fixation and cyanosilylation.
• The structural diversity of the complexes influences their catalytic performance.