Synthesis of Electron-Deficient BisAzaCoroneneDiimide-Conjugated Polymers by Light-Locking Dynamic Covalent Bonds

Area of Science:

• Materials Science
• Polymer Chemistry
• Organic Electronics

Background:

• Conjugated polymers are crucial for organic electronics.
• Developing stable, n-type semiconducting polymers with tunable properties remains a challenge.
• Existing methods often involve harsh conditions or metal catalysts.

Purpose of the Study:

• To introduce a novel, metal-free polymerization method for synthesizing conjugated polymers.
• To create n-type semiconducting polymers with BisAzaCoroneneDiimides (BACDs) as a core unit.
• To achieve tunable optical and electronic properties with high stability.

Main Methods:

• A light-locked dynamic covalent polymerization using visible light.
• Conversion of reversible polyimines into kinetically locked conjugated polymers.
• Incorporation of aldehyde-functionalized comonomers to tune polymer structure.

Main Results:

• Successful synthesis of diverse n-type semiconducting polymers based on BACDs.
• Polymers exhibit tunable optical band gaps and low LUMO levels.
• Demonstrated exceptional thermal, electrochemical, and photostability.
• Observed strong interchain interactions upon reduction due to the BACD core.
• Broad absorption across visible to near-infrared spectrum.

Conclusions:

• The developed methodology provides a scalable and sustainable route to n-type diimide polymers.
• These polymers show significant potential for charge and energy transport in organic electronics.
• The light-locked dynamic covalent approach offers precise control over polymer properties.