title: Conducting π Columns of Highly Symmetric Coronene, The Smallest Fragment of Graphene.
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.
authors.affiliation: Faculty of Agriculture, Meijo University, Nagoya, 468-8502, Japan. yyoshida@meijo-u.ac.jp.
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Yoshida
authors.affiliation: Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan.
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Isomura
authors.affiliation: Department of Applied Physics, Nagoya University, Nagoya, 464-8603, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Kishida
authors.affiliation: Department of Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, 920-1192, Japan.
authors.forename: Yoshihide
authors.initials: Y
authors.lastname: Kumagai
authors.affiliation: Department of Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, 920-1192, Japan.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Mizuno
authors.affiliation: KYOKUGEN, Center for Science and Technology under Extreme Conditions, Graduate School of Engineering Science, Osaka University, Toyonaka, 560-8531, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Sakata
authors.affiliation: Center for Emergent Matter Science, RIKEN, Wako, 351-0198, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Koretsune
authors.affiliation: Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto, 606-8501, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Nakano
authors.affiliation: Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto, 606-8501, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Yamochi
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan.
authors.forename: Mitsuhiko
authors.initials: M
authors.lastname: Maesato
authors.affiliation: Faculty of Agriculture, Meijo University, Nagoya, 468-8502, Japan.|Toyota Physical and Chemical Research Institute, Nagakute, 480-1192, Japan.
authors.forename: Gunzi
authors.initials: G
authors.lastname: Saito
keywords: Jahn-Teller distortion; charge transfer; conducting materials; electronic structure; pi interactions