Hashimoto Yuichiro, Nakashima Takuya, Yamada Miku, Yuasa Junpei, Rapenne Gwénaël, Kawai Tsuyoshi
Graduate School of Materials Science , Nara Institute of Science and Technology , Ikoma, Nara 630-0192 , Japan.
Department of Applied Chemistry , Tokyo University of Science , Kagurazaka, Shinjuku , Tokyo 162-8061 , Japan.
J Phys Chem Lett. 2018 May 3;9(9):2151-2157. doi: 10.1021/acs.jpclett.8b00690. Epub 2018 Apr 13.
Chiroptical photoswitches are of interest from a viewpoint of applications in advanced information technologies. We report dynamic on-off photoswitching of circularly polarized luminescence (CPL) in a binuclear europium complex system. Two coordination units are arranged closely in a chiral fashion by a photoresponsive ligand with a one-handed helical structure. The chirality in the helical scaffold is hierarchically transferred to the chirality in nine-coordinate complex sites. The chiral close arrangement of complex units induces the enrichment of a specific chiral coordination structure in the nine-coordinate europium sites. The chiral arrangement of complex units is switched in conjunction with the photoinduced helix-nonhelix structural change in the photoresponsive framework, demonstrating on-off switching of CPL with high contrast.
从先进信息技术应用的角度来看，手性光开关备受关注。我们报道了双核铕配合物体系中圆偏振发光（CPL）的动态开-关光开关特性。两个配位单元通过具有单手螺旋结构的光响应配体以手性方式紧密排列。螺旋支架中的手性逐级传递到九配位配合物位点的手性上。配合物单元的手性紧密排列导致九配位铕位点中特定手性配位结构的富集。配合物单元的手性排列与光响应框架中光诱导的螺旋-非螺旋结构变化协同切换，展示了具有高对比度的CPL开-关切换。
