Off-off-on chiroptical property switching of a pyrene luminophore by stepwise helicate formation
Off-off-on chiroptical property switching of a pyrene luminophore by stepwise helicate formation
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DOI：
10.1039/c9cc01138b
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发表时间：
2019-04-11
影响因子：
4.9
通讯作者：
Yuasa, Junpei
中科院分区：
文献类型：
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作者：
Imai, Yuki;Yuasa, Junpei
在1，8-位上由两个手性咪唑侧臂组成的基于芘的手性配体（L-R和L-S）首先形成芘桥接的低聚物[（L-（RorS））（3）（Zn 2+）（n）]，其是手性非活性的，具有低浓度的锌离子（Zn 2+）。当加入更多的Zn 2+时，形成手性活性配位螺旋化合物（[（L-（RorS））（3）（Zn 2+）（2）]）。逐步组装过程成功地促进了由Zn 2+浓度控制的芘发光体的关-关-开手性光学切换过程。所得到的芘桥连螺旋化合物在圆二色性的不对称因子方面表现出高性能（|克（CD）|0.006）和圆偏振发光（|克（CPL）|= 0.01）。
Pyrene-based chiral ligands (L-R and L-S) consisting of two chiral imidazole sidearms at the 1,8-positions first form pyrene-bridged oligomers [(L-(RorS))(3)(Zn2+)(n)], which are chiroptically inactive, with a low concentration of zinc ions (Zn2+). Upon addition of more Zn2+, chiroptically active coordination helicates ([(L-(RorS))(3)(Zn2+)(2)]) are formed. The stepwise assembly process successfully facilitated an off-off-on chiroptical switching process of a pyrene luminophore controlled by the concentration of Zn2+. The resulting pyrene-bridged helicates exhibit high performance in terms of a dissymmetry factor of circular dichroism (|g(CD)| = 0.006) and circularly polarized luminescence (|g(CPL)| = 0.01).