Thienothiophene‐Based Organic Porous Polymers Combining Different Linkers and Functional Groups: Design, Synthesis, Photophysical, and Charge Transport Properties

Abstract

Abstract Organic covalent frameworks (COFs) are essential for various applications, including solar cells, capacitors, hydrogen production, cancer therapy, bacterial treatment, chemical sensors, and light‐emitting diodes. This study presents the design and synthesis of novel conjugated triazine‐type porous polymers ( P1 – P6 ) and their conjugated monomers ( M1‐ ‐ M6 ), incorporating thienothiophene (TT) rings as π‐bridges, along with cyanophenyl, phenyl, and heptyl as different functional groups, and triphenylamine (TPA), tetraphenylethylene (TPE), and carbazole (Cbz) as linkers. The polymers were synthesized via acid‐catalyzed trimerization. Photo‐injected charge carriers of the polymers and impact of molecular doping on the conductivities with iodine doping were analyzed. The highest photoconductivity, φ∑μ, reached 2.4 × 10 −8 m 2 V −1 s −1 when doped with I 2 for the heptyl chain‐substituted P6 (Cbz‐linkage) among the analyzed porous polymers.