A covalent organic framework as a photocatalyst for window ledge cross-dehydrogenative coupling reactions

Area of Science:

• Materials Science
• Organic Chemistry
• Photocatalysis

Background:

• Covalent organic frameworks (COFs) are crystalline porous polymers.
• Donor-acceptor (D-A) architectures in COFs can enhance electronic properties.
• Efficient photocatalysts are needed for sustainable organic synthesis.

Purpose of the Study:

• To synthesize and characterize a benzothiadiazole-containing D-A COF.
• To evaluate its performance as a photocatalyst for aerobic cross-dehydrogenative coupling (CDC) reactions.
• To demonstrate its efficacy in gram-scale reactions.

Main Methods:

• Synthesis of a benzothiadiazole-based D-A COF.
• Characterization of crystallinity and light-harvesting properties (300-800 nm).
• Photocatalytic testing of CDC reactions (e.g., Mannich, aza-Henry) under aerobic conditions.

Main Results:

• The synthesized COF exhibited high crystallinity.
• The material demonstrated broad light absorption from 300 to 800 nm.
• The COF effectively catalyzed aerobic CDC reactions, including Mannich and aza-Henry reactions, at gram scale.

Conclusions:

• Benzothiadiazole-based D-A COFs are promising photocatalysts.
• High crystallinity and broad light absorption contribute to catalytic efficiency.
• This COF enables scalable and sustainable aerobic CDC reactions.