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Updated: Dec 31, 2025

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Quinoidal Oligothiophenes Having Full Benzene Annelation: Synthesis, Properties, Structures, and Acceptor Application
Keitaro Yamamoto1, Seihou Jinnai1, Tsunayoshi Takehara1,2
1The Institute of Scientific and Industrial Research (ISIR) , Osaka University , 8-1 Mihogaoka , Ibaraki , Osaka 567-0047 , Japan.
Abstract:
To achieve a complete closed-shell quinoidal state, bis(dicyanomethylene)-substituted quinoidal terthiophenes bearing benzene annelation at all thiophene rings were synthesized using a retro-Diels-Alder reaction as the key step. The unique structures and properties originating from the full benzene annelation were revealed by X-ray analysis as well as property measurements. Organic solar cells based on the combination of a donor polymer with a quinoidal terthiophene as an acceptor showed a power conversion efficiency of 1.39%.
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