Copper Single Atoms Chelated on Ligand-Modified Carbon for Ullmann-type C-O Coupling

Area of Science:

• Catalysis
• Materials Science
• Organic Chemistry

Background:

• Cross-coupling reactions are vital for synthesizing complex organic molecules.
• Ullmann-type C-O coupling is important for diarylether synthesis but often uses unstable homogeneous catalysts.
• Harsh reaction conditions lead to rapid deactivation of traditional catalysts.

Purpose of the Study:

• To develop a novel, recyclable heterogeneous catalyst for Ullmann-type C-O coupling.
• To investigate the role of ligands in stabilizing metal sites in single-atom catalysts.
• To provide an efficient alternative to homogeneous catalysts for diarylether synthesis.

Main Methods:

• Immobilization of isolated copper atoms chelated to a tetraethylenepentamine-pyrrole ligand on graphite nanoplatelets.
• Characterization of the heterogeneous catalyst's structure and stability.
• Evaluation of catalytic activity in Ullmann-type C-O coupling reactions.

Main Results:

• The novel heterogeneous catalyst demonstrated excellent recyclability.
• The pyrrole linker was identified as crucial for stabilizing the copper sites.
• The catalyst efficiently facilitated Ullmann-type C-O coupling reactions, producing diarylethers.
• The study confirmed the potential of single-atom catalyst nanoarchitectures.

Conclusions:

• A stable and recyclable heterogeneous catalyst for Ullmann-type C-O coupling has been developed.
• Ligands play a significant role in stabilizing cationic metal sites in single-atom catalysts.
• This work offers a promising new catalyst for cross-coupling chemistries and advances single-atom catalysis.