Synthesis and properties of naphthobisbenzo[b]thiophenes: structural curvature of higher acene frameworks for solubility enhancement and high-order orientation in crystalline states |
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Authors: | Kazuhiro Yamamoto Hiroshi Katagiri Hiroki Tairabune Yuji Yamaguchi Yong-Jin Pu Ken-ichi Nakayama Yoshihiro Ohba |
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Institution: | Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan |
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Abstract: | The syntheses of naphtho2,3-b:7,6-b′]- and naphtho2,1-b:5,6-b′]bisbenzob]thiophenes (NBBTs) are achieved via inter- and intramolecular stepwise Friedel–Crafts-type reactions. The structural curvature of these NBBTs are found to improve their solubility in organic solvents, and to form well-defined herringbone structures in single crystals, especially when the C2v symmetrical naphtho2,3-b:7,6-b′]bisbenzob]thiophene takes the form of asymmetric space groups in a parallel direction with each other, and having exhibited OFET characteristics with a hole mobility of 7 × 10?5 cm2 V?1 s?1. |
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