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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Stimuli-Responsive Fluorescent Azobenzene Nanofibers

등록일
2014년 9월 3일 11시 41분 06초
접수번호
1432
발표코드
MAT.O-15 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 12시 : 48분
발표형식
구두발표
발표분야
재료화학 - Current Trends in Materials Chemistry
저자 및
공동저자
한민아*, 조성준1, Yasuo Norikane2, Masaki Shimizu3, Akinori Kimura3, Tomokazu Tamagawa3, Takahiro Seki4
Nagoya University, Korea
1전남대학교 응용화학공학부, Korea
2National Institute of Advanced Industrial Science and Technology (AIST), Japan
3Kyoto Institute of Technology, Japan
4Nagoya University, Japan
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승인 6건
The creation of diverse nano/microstructures and their functions depends not only on the nature of their molecular components but also on the spatial arrangement of the functional groups. For instance, C3-symmetrical molecules show a propensity to be effectively packed into one-dimensional (1D) cylindrical tubules, fibers, or helices through non-covalent interactions such as pi-pi stacking, hydrogen bonding and/or van der Waals interactions. The 1D structures have received much attention due to their potential for molecular alignment, conductivity, mass transporting, and optoelectronic materials. In this study, we designed a trigonal azobenzene-based chromophore to create fluorescent one-dimensional (1D) structures with high crystallinity. Our experimental results indicate that a conformational transformation from a distorted to a partially planar form during assembly would allow the chromophore to effectively assemble into a crystalline fiber in an inclined fashion. The formation of the crystalline fibers is thus accompanied by a significant red shift in absorption bands and an increase in fluorescence efficiency. The enhanced fluorescence can be readily switched off by weakening the degree of crystallinity. Moreover, even in a solvent-free polymer matrix in which azobenzene-based chromophores are well dispersed, the chromophores are distinguished from the polymer matrix by their strong ability to assemble into cylindrical aggregates and by the resulting color and fluorescence characteristics. References 1. M. Han and M. Hara, J. Am. Chem. Soc. 127, 10951 (2005). 2. Y. Hong, J. Lam, B. Z. Tang, Chem. Soc. Rev. 40, 5361 (2011). 3. B. An, J. Gierschner, S. Y. Park, Acc. Chem. Res. 45, 544 (2012).

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