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Structural-Functional Properties of Asymmetric Fluoro-Alkoxy Substituted Benzothiadiazole Homopolymers with Flanked
Marc Comí1, Salvador Moncho1, Salahuddin Attar1
1Department of Chemistry, Texas A&M University at Qatar, Education City, Doha, P.O. Box 23874, Qatar.
Macromolecular Rapid Communications
|October 26, 2022
Summary
Researchers tuned conjugated polymer properties by modifying heterocycles. Changing chalcogen atoms (O, S, Se) in flanking groups significantly shifted optical properties and energy levels for optoelectronic applications.
Area of Science:
- Materials Science
- Organic Chemistry
- Polymer Chemistry
Background:
- Benzothiadiazole (BT) derivatives are crucial in organic electronics.
- Tuning polymer properties is key for advanced optoelectronic devices.
- Heterocyclic substituents significantly influence polymer characteristics.
Purpose of the Study:
- Synthesize and characterize novel asymmetric fluoro-benzothiadiazole polymers.
- Investigate the impact of six different heterocycles on polymer properties.
- Explore structure-property relationships for optoelectronic applications.
Main Methods:
- Synthesis of six homopolymers (HPX) with varying heterocycles.
- Optical, thermal, and electrochemical characterization.
- Computational analysis (DFT) for conformational and electronic studies.
Main Results:
- Conformational preferences (syn-syn, syn-anti, anti-anti) correlate with heterocycle type and noncovalent interactions.
- Strong red-shifts in optical spectra observed with increasing chalcogen size (O < S < Se).
- Donor-acceptor polymers exhibit deeper HOMO levels and improved morphology compared to acceptor-acceptor systems.
Conclusions:
- Flanked heterocycles with different chalcogen atoms effectively tune polymer physicochemical properties.
- Tailoring heterocycles offers a pathway to control conjugated materials for optoelectronics.
- The study provides insights into designing high-performance organic electronic materials.
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