Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, 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, 130 Meilong Road, Shanghai 200237, China.
ACS Appl Mater Interfaces. 2023 May 31;15(21):25201-25211. doi: 10.1021/acsami.2c22349. Epub 2023 Apr 4.
The dynamic control of circularly polarized luminescence (CPL) has far-reaching significance in optoelectronics, information storage, and data encryption. Herein, we reported the reversible inversion of CPL in a coassembly supramolecular system consisting of chiral molecules L4, which contain two positively charged viologen units, and achiral ionic surfactant sodium dodecyl sulfate (SDS) by introducing achiral sulforhodamine B (SRB) dye molecules. The chirality of CPL in the coassemblies can be efficiently regulated and inverted by simply adjusting the amount of SRB. A series of experimental characterization, including optical spectroscopy, electron microscope, H NMR, and X-ray scattering measurements, suggested that SRB could coassemble with L4/SDS to establish a new stable L4/SDS/SRB supramolecular structure through electrostatic interactions. Moreover, the negative-sign CPL could revert to the positive-sign CPL if titanium dioxide (TiO) nanoparticles were used to decompose SRB molecules. The evolution of the CPL inversion process could be cycled at least 5 times without a significant decline in CPL signals when SRB was refueled to the system. Our results provide a facile approach to dynamically regulating the handedness of CPL in a multiple-component supramolecular system via achiral species.
手性分子 L4 中含有两个正电荷的紫罗精单元，与非手性离子型表面活性剂十二烷基硫酸钠（SDS）组装形成超分子体系，通过引入非手性磺基罗丹明 B（SRB）染料分子，我们报道了该超分子体系中圆偏振发光（CPL）的动态可逆反转。通过简单调节 SRB 的用量，可有效调控和反转 CPL 的手性。一系列的实验表征，包括光谱学、电子显微镜、核磁共振和 X 射线散射测量等，表明 SRB 可以与 L4/SDS 共组装，通过静电相互作用建立一种新的稳定的 L4/SDS/SRB 超分子结构。此外，如果使用二氧化钛（TiO）纳米粒子分解 SRB 分子，则可以将负手性 CPL 反转成正手性 CPL。当向体系中补充 SRB 时，CPL 反转过程的演变至少可以循环 5 次，而 CPL 信号没有明显下降。我们的研究结果为通过非手性物种在手性多组分超分子体系中动态调控 CPL 的手性提供了一种简便的方法。
