Journal
EUROPEAN POLYMER JOURNAL
Volume 46, Issue 8, Pages 1790-1795Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2010.04.019
Keywords
Conjugated polymer; Low-bandgap polymer; Thienothiophene; n-Doping
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Funding
- Korea Research Foundation [KRF-2007-521-D00193]
- Sunchon National University
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New thieno[3,4-b]thiophene derivatives were prepared via a short and versatile synthetic route. Electrochemical studies of 2-heptenylthieno[3,4-b]thiophene, 2-styrylthieno[3,4-b]thiophene, and 2-phenyl-3-(thieno[3,4-b]thiophene-2-yl)acrylonitrile and the corresponding polymers revealed that raising the HOMO and lowering the LUMO can be attained by functionalizing thieno[3,4-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-(thieno[3,4-b]thiophene-2-yl)acrylonitrile) is one of the lowest bandgap polymers ever reported. (C) 2010 Elsevier Ltd. All rights reserved.
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