Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road 130, Shanghai, 200237, P. R. China.
Angew Chem Int Ed Engl. 2021 Feb 8;60(6):2855-2860. doi: 10.1002/anie.202011740. Epub 2020 Dec 9.
The construction of artificial structures through hierarchical self-assembly based on noncovalent interactions, as well as monitoring during the self-assembly process, are important aspects of dynamic supramolecular chemistry. Herein we describe the complex dynamics of chiral N,N'-diphenyl dihydrodibenzo[a,c]phenazine derivatives (S)/(R)-DPAC, whose different assemblies were found to have distinct optical and morphological characteristics. With ratiometric fluorescence originating from vibration-induced emission (VIE), the self-assembly process from kinetic traps to the thermodynamic equilibrium state could be monitored in real time by optical spectrometry. During the morphology transformation from particles to nanobricks, strong circularly polarized luminescence was induced with g =1.6×10 . The excited-state characteristics of the self-assemblies enabled investigation of the relationship between molecular aggregation and conformational change, thus allowing effective monitoring of the sophisticated supramolecular self-assembly process.
通过基于非共价相互作用的分级自组装来构建人工结构，以及在自组装过程中进行监测，是动态超分子化学的重要方面。在这里，我们描述了手性 N,N'-二苯基二氢二苯并[a,c]吩嗪衍生物（S）/（R）-DPAC 的复杂动力学，其不同的组装体具有不同的光学和形态特征。通过源于振动诱导发射（VIE）的比率荧光，可以通过光谱法实时监测从动力学陷阱到热力学平衡状态的自组装过程。在从颗粒到纳米砖的形态转变过程中，诱导出了强度为 g =1.6×10-3 的强圆偏振发光。自组装体的激发态特性使得可以研究分子聚集与构象变化之间的关系，从而可以有效地监测复杂的超分子自组装过程。
