Zhao Tonghan, Han Jianlei, Jin Xue, Liu Yan, Liu Minghua, Duan Pengfei
Division of Nanophotonics, CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology (NCNST), No.11, ZhongGuanCun BeiYiTiao, Beijing, 100190, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Angew Chem Int Ed Engl. 2019 Apr 1;58(15):4978-4982. doi: 10.1002/anie.201900052. Epub 2019 Mar 8.
A chiral zeolitic imidazolate framework (ZIF) showing circularly polarized luminescence (CPL) has been successfully constructed by blending binapthyl-derived chiral emitters with ZIF-8 rhombic dodecahedron nanoparticles. This approach solves a major trade-off in CPL-active materials: the large luminescence dissymmetry factor (g ) always suffers from suppression of luminescence efficiency. Compared to the optical properties of chiral emitters, the obtained chiral ZIF nanomaterials showed an enhanced fluorescence efficiency while the |g | value is significantly amplified by one order of magnitude. Additionally, enantioselective fluorescence sensing in response to α-hydroxycarboxylic acids has been enhanced in chiral ZIFs. Reorganization and conjunction of chiral emitters to the skeleton of ZIF nanoparticles can greatly improve both the luminescence quantum yield and circularly polarization, which facilitates the design of more efficient chiroptical materials.
通过将联萘衍生的手性发光体与ZIF-8菱形十二面体纳米颗粒混合，成功构建了一种具有圆偏振发光（CPL）的手性沸石咪唑酯骨架（ZIF）。这种方法解决了CPL活性材料中的一个主要权衡问题：大的发光不对称因子（g）总是伴随着发光效率的抑制。与手性发光体的光学性质相比，所获得的手性ZIF纳米材料显示出增强的荧光效率，而|g|值显著放大了一个数量级。此外，手性ZIFs中对α-羟基羧酸的对映选择性荧光传感得到了增强。手性发光体与ZIF纳米颗粒骨架的重组和结合可以极大地提高发光量子产率和圆偏振，这有助于设计更高效的手性光学材料。
