Lewis Acid Regulation Strategy for Constructing D-A-A Covalent Organic Frameworks with Enhanced Photocatalytic...

Area of Science:

• Materials Science
• Photocatalysis
• Organic Chemistry

Background:

• Donor-acceptor (D-A) type photocatalytic covalent organic frameworks (COFs) show promise due to their photoelectric properties.
• Existing D-A COFs have limited structural diversity, hindering the development of advanced photocatalytic materials.

Purpose of the Study:

• To develop novel D-A-A type COFs with enhanced photocatalytic activity.
• To utilize Lewis acid regulation for creating new COF structures and improving charge carrier separation.

Main Methods:

• Synthesized a series of D-A-A type COFs using a Lewis acid regulation strategy.
• Employed pyridine and cyano groups as ligands coordinated to Lewis acid centers.
• Investigated the photocatalytic performance of the synthesized COFs under visible light.

Main Results:

• Lewis acid sites in the D-A-A COFs acted as electron acceptors, promoting photogenerated electron-hole pair separation.
• The developed COFs demonstrated efficient visible-light-driven hydroxylation of phenylboronic acid compounds.
• Reduced charge carrier recombination rates significantly enhanced photocatalytic reaction efficiency.

Conclusions:

• Lewis acid-activated D-A-A COFs represent a promising new class of photocatalysts.
• These COFs offer a strategy to overcome limitations in existing D-A COFs.
• The developed catalysts can contribute to more efficient fabrication of valuable organic materials.