Morphology Control of Oxadiazole Compounds by Introduction of Amine Moieties
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概要
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Three oxadiazole derivatives with an amine and an alkyl tail were designed and synthesized as novel photo- and electro-active materials: 2-(4$'$-propylbiphenyl-4-yl)-5-(4-N,N-dimethylaminophenyl-4-yl)-1,3,4,-oxadiazole (3-OXD-Me), 2-(4$'$-heptybiphenyl-4-yl)-5-(4-N,N-dimethylaminophenyl-4-yl)-1,3,4,-oxadiazole (7-OXD-Me), 2-(4$'$-heptylbiphenyl-4-yl)-5-(4-N,N-diphenylaminophenyl)-1,3,4,-oxadiazole (7-OXD-Ph). It was found that the length of an alkyl tail and the structure of an amine strongly affect the phase structure of the oxadiazole derivatives; 3-OXD-Me showed a crystalline phase, 7-OXD-Me showed a liquid-crystalline (LC; nematic) phase and 7-OXD-Ph exhibited a glassy amorphous state. All the compounds emitted strong blue fluorescence: the maximum wavelengths of emission were 420–436 nm with high quantum yields (0.81–0.91). Furthermore, polarized photoluminescence was observed in 7-OXD-Me in a nematic phase, and the order parameter estimated by the polarized emission was 0.18. These compounds, therefore, are potential multifunctional materials for photo- and electro-active devices.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2005-01-15
著者
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Mochizuki Hiroyuki
National Inst. Advanced Industrial Sci. And Technol. Osaka Jpn
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Ikeda Tomiki
Chemical Resources Lab. Tokyo Inst. Of Technol.
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Mochizuki Hiroyuki
National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
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Hasui Takahiro
Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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