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A concise synthesis and electrochemical behavior of functionalized poly(thieno[3,4-b]thiophenes): New conjugated polymers with low bandgap |
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| Authors: | Jin Hong Park Dae Hyun Yoon Soo-Hyoung Lee Kyukwan Zong |
| Institution: | a Institute of Fusion Science, Division of Science Education, Chonbuk National University, Jeonju 561-756, South Korea b Department of Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, Jeonju 561-756, South Korea c Department of Printed Electronics Engineering, Sunchon National University, Sunchon 540-742, South Korea |
| Abstract: | New thieno3,4-b]thiophene derivatives were prepared via a short and versatile synthetic route. Electrochemical studies of 2-heptenylthieno3,4-b]thiophene, 2-styrylthieno3,4-b]thiophene, and 2-phenyl-3-(thieno3,4-b]thiophene-2-yl)acrylonitrile and the corresponding polymers revealed that raising the HOMO and lowering the LUMO can be attained by functionalizing thieno3,4-b]thiophene with aromatic resonance-enhancing and electron-withdrawing groups. The bandgap of resulting polymers varied from 0.78 to 1.0 eV, indicating that poly(2-phenyl-3-(thieno3,4-b]thiophene-2-yl)acrylonitrile) is one of the lowest bandgap polymers ever reported. |
| Keywords: | Conjugated polymer Low-bandgap polymer Thienothiophene n-Doping |
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