Hydrogen bond-promoted metallic state in a purely organic single-component conductor under pressure

Takayuki Isono, Hiromichi Kamo, Akira Ueda, Kazuyuki Takahashi, Akiko Nakao, Reiji Kumai, Hironori Nakao, Kensuke Kobayashi, Youichi Murakami and Hatsumi Mori ()
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Takayuki Isono: The Institute for Solid State Physics, The University of Tokyo
Hiromichi Kamo: The Institute for Solid State Physics, The University of Tokyo
Akira Ueda: The Institute for Solid State Physics, The University of Tokyo
Kazuyuki Takahashi: Kobe University
Akiko Nakao: Comprehensive Research Organization for Science and Society (CROSS)
Reiji Kumai: CMRC and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
Hironori Nakao: CMRC and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
Kensuke Kobayashi: CMRC and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
Youichi Murakami: CMRC and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
Hatsumi Mori: The Institute for Solid State Physics, The University of Tokyo

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Purely organic materials are generally insulating. Some charge-carrier generation, however, can provide them with electrical conductivity. In multi-component organic systems, carrier generation by intermolecular charge transfer has given many molecular metals. By contrast, in purely organic single-component systems, metallic states have rarely been realized although some neutral-radical semiconductors have been reported. Here we uncover a new type of purely organic single-component molecular conductor by utilizing strong hydrogen-bonding interactions between tetrathiafulvalene-based electron-donor molecules. These conductors are composed of highly symmetric molecular units constructed by the strong intra-unit hydrogen bond. Moreover, we demonstrate that, in this system, charge carriers are produced by the partial oxidation of the donor molecules and delocalized through the formation of the symmetric intra-unit hydrogen bonds. As a result, our conductors show the highest room-temperature electrical conductivity and the metallic state under the lowest physical pressure among the purely organic single-component systems, to our knowledge.

Date: 2013
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DOI: 10.1038/ncomms2352

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