Volume 130, Issue 19 pp. 5536-5541
Zuschrift

Conformational Planarization versus Singlet Fission: Distinct Excited-State Dynamics of Cyclooctatetraene-Fused Acene Dimers

Takuya Yamakado

Takuya Yamakado

Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan

These authors contributed equally to this work.

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Shota Takahashi

Shota Takahashi

Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan

These authors contributed equally to this work.

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Prof. Dr. Kazuya Watanabe

Corresponding Author

Prof. Dr. Kazuya Watanabe

Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan

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Prof. Dr. Yoshiyasu Matsumoto

Prof. Dr. Yoshiyasu Matsumoto

Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan

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Prof. Dr. Atsuhiro Osuka

Prof. Dr. Atsuhiro Osuka

Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan

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Prof. Dr. Shohei Saito

Corresponding Author

Prof. Dr. Shohei Saito

Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan

JST-PRESTO, FRONTIER, Japan

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First published: 08 March 2018
Citations: 28

Abstract

A set of flapping acene dimers fused with an 8π cyclooctatetraene (COT) ring showed distinct excited-state dynamics in solution. While the anthracene dimer showed a fast V-shaped-to-planar conformational change within 10 ps in the lowest excited singlet state, reminding us of extended Baird aromaticity, the tetracene dimer and the pentacene dimer underwent intramolecular singlet fission (SF) in different manners: A fast and reversible SF with a characteristic delayed fluorescence (FL), and a fast and quantitative SF, respectively. Conformational flexibility of the fused COT linkage plays an important role in these ultrafast dynamics, demonstrating the utility of the flapping molecular series as a versatile platform for designing photofunctional systems.

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