Conducting π Columns of Highly Symmetric Coronene,The Smallest Fragment of Graphene |
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| Authors: | Dr. Yukihiro Yoshida Kazuhide Isomura Prof. Hideo Kishida Yoshihide Kumagai Prof. Motohiro Mizuno Dr. Masafumi Sakata Dr. Takashi Koretsune Dr. Yoshiaki Nakano Prof. Hideki Yamochi Dr. Mitsuhiko Maesato Prof. Gunzi Saito |
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| Affiliation: | 1. Faculty of Agriculture, Meijo University, Nagoya, Japan;2. Department of Applied Physics, Nagoya University, Nagoya, Japan;3. Department of Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Japan;4. KYOKUGEN, Center for Science and Technology under Extreme Conditions, Graduate School of Engineering Science, Osaka University, Toyonaka, Japan;5. Center for Emergent Matter Science, RIKEN, Wako, Japan;6. Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto, Japan;7. Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan;8. Toyota Physical and Chemical Research Institute, Nagakute, Japan |
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| Abstract: | Coronene, which is the smallest D6h‐symmetric polycyclic aromatic hydrocarbon, attracts particular attention as a basic component of electronic materials because it is the smallest fragment of graphene. However, carrier generation by physical methods, such as photo‐ or electric field‐effect, has barely been studied, primarily because of the poor π‐conduction pathway in pristine coronene solid. In this work we have developed unprecedented π‐stacking columns of cationic coronene molecules by electrochemical hole‐doping with polyoxometallate dianions. The face‐to‐face π–π interactions as well as the partially charged state lead to electrical conductivity at room temperature of up to 3 S cm?1, which is more than 10 orders of magnitude higher than that of pristine coronene solid. Additionally, the robust π–π interactions strongly suppress the in‐plane rotation of the coronene molecules, which has allowed the first direct observation of the static Jahn–Teller distortion of cationic coronene molecules. |
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| Keywords: | charge transfer conducting materials electronic structure Jahn– Teller distortion pi interactions |
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