π‐Electron‐System‐Layered Polymer: Through‐Space Conjugation and Properties as a Single Molecular Wire |
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| Authors: | Prof Yasuhiro Morisaki Shizue Ueno Prof Akinori Saeki Atsushi Asano Prof Shu Seki Prof Yoshiki Chujo |
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| Institution: | 1. Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615‐8510 (Japan), Fax: (+81)?753832607;2. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2‐1 Yamadaoka, Suita, Osaka 565‐0871 (Japan);3. PRESTO Japan Science and Technology Agency (JST), 4‐1‐8 Honcho Kawaguchi, Saitama 332‐0012 (Japan) |
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| Abstract: | 2.2]Paracyclophane‐based through‐space conjugated oligomers and polymers were prepared, in which poly(p‐arylene–ethynylene) (PAE) units were partially π‐stacked and layered, and their properties in the ground state and excited state were investigated in detail. Electronic interactions among PAE units were effective through at least ten units in the ground state. Photoexcited energy transfer occurred from the stacked PAE units to the end‐capping PAE moieties. The electrical conductivity of the polymers was estimated using the flash‐photolysis time‐resolved microwave conductivity (FP‐TRMC) method and investigated together with time‐dependent density functional theory (TD‐DFT) calculations, showing that intramolecular charge carrier mobility through the stacked PAE units was a few tens of percentage larger than through the twisted PAE units. |
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| Keywords: | conjugation molecular wires paracyclophanes polymers time‐resolved microwave conductivity |
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