Toward Ultralow‐Bandgap Liquid Crystalline Semiconductors: Use of Triply Fused Metalloporphyrin Trimer–Pentamer as Extra‐large π‐Extended Mesogenic Motifs |
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| Authors: | Seiya Tanaka Tsuneaki Sakurai Yoshihito Honsho Dr Akinori Saeki Prof?Dr Shu Seki Dr Kenichi Kato Prof?Dr Masaki Takata Prof?Dr Atsuhiro Osuka Prof?Dr Takuzo Aida |
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| Institution: | 1. Department of Chemistry and Biotechnology, School of Engineering, the University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku, Tokyo 113‐8656 (Japan), Fax: (+81)?3‐5841‐7310;2. Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 2‐1 Yamadaoka, Suita, Osaka 565‐0871 (Japan);3. RIKEN SPring‐8 Center, 1‐1‐1 Kouto, Sayo‐cho, Sayo‐gun, Hyogo 679‐5148 (Japan);4. Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo‐ku, Kyoto 606‐8502 (Japan) |
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| Abstract: | In contrast with their dimeric homologue, triply fused zinc porphyrin trimer–pentamer, as extra‐large π‐extended mesogens, assemble into columnar liquid crystals (LCs) when combined with 3,4,5‐tri(dodecyloxy)phenyl side groups ( 3 PZn – 5 PZn , Figure 1 ). Their LC mesophases develop over a wide temperature range, namely, 41–280 °C (on heating) for 5 PZn , and all adopt an oblique columnar geometry, typically seen in columnar LC materials involving strong mesogenic interactions. These LC materials are characterized by their wide light‐absorption windows from the entire visible region up to a near infrared (NIR) region. Such ultralow‐bandgap LC materials are chemically stable and serve as hole transporters, in which 5 PZn gives the largest charge carrier mobility (2.4×10?2 cm V?1 s?1) among the series. Despite a big dimensional difference, they coassemble without phase separation, in which the resultant LC materials display essentially no deterioration of the intrinsic conducting properties. |
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| Keywords: | liquid crystals porphyrins self‐assembly semiconductors organic electronics |
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