Azine-Pyridine Frame Generated Covalent Organic Frameworks and Self-Polymerized Films

Area of Science:

• Materials Science
• Synthetic Chemistry
• Nanotechnology

Background:

• Engineering covalent organic frameworks (COFs) into industrializable films with inherent functionalities is a significant challenge.
• Powdery COFs lack the processability and scalability required for widespread application.

Purpose of the Study:

• To develop a generalizable synthetic strategy for converting powdery COFs into self-polymerized films.
• To explore the novel properties and potential applications of these new COF films.

Main Methods:

• Development of a skeletal azine-pyridine conformation for COF synthesis.
• Utilizing active proton tautomerism and thermochromism for self-polymerization.
• Green and ambient condition processing for film formation.

Main Results:

• Successful conversion of powdery COFs into large-area COF films (10 nm to >30 µm thickness).
• Films exhibit outstanding chemical stability, industrializable processability, and mechanical strength.
• Demonstrated high reducing capacities for heavy metal ions (Au3+, Cr6+), efficient UV-blue light shielding, and a 10-fold increase in Zn battery lifespan.

Conclusions:

• The azine-pyridine synthetic frame provides a versatile route for producing functional COF films.
• This approach is expected to advance reticular chemistry, environmental science, and nano-electronics.
• The developed COF films offer a promising platform for next-generation materials.