Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200D, Box 2425, 3001 Heverlee, Belgium.
J Phys Chem B. 2021 Mar 18;125(10):2690-2695. doi: 10.1021/acs.jpcb.0c09733. Epub 2021 Mar 3.
An understanding of macroscopic vortex-induced chirality can provide insights into the origin of the homochirality of life. While circular dichroism measurements in stirred solutions are useful for the analysis of chiral supramolecular structures induced by vortex motion, there are no reports on the application of other spectroscopic methods. To obtain a deeper understanding of macroscopic vortex-induced chirality, it is essential to develop novel spectroscopic methods that provide information about changes in both the size and chirality in stirred solutions. Here, we report the first observation by harmonic light scattering of the mirror-symmetry-breaking process of porphyrin J-aggregates under the rotation of a magnetic stirrer. The chiral supramolecular structure observed during stirring is likely due to the formation of a chiral aggregate that consists of porphyrin J-aggregates. The dissociation of the structure proceeds in two steps (a fast step and a slow step), as indicated by the signal decay rate when stirring was stopped. This novel method is useful for analyzing the supramolecular structural changes of chiral aggregates induced by external stimuli.
宏观涡旋诱导手性的理解可以为生命手性的起源提供线索。虽然搅拌溶液中的圆二色性测量对于分析由涡旋运动诱导的手性超分子结构很有用，但没有关于其他光谱方法应用的报道。为了更深入地了解宏观涡旋诱导手性，开发提供搅拌溶液中尺寸和手性变化信息的新型光谱方法至关重要。在这里，我们首次通过谐波光散射观察到在磁力搅拌器旋转下卟啉 J-聚集体的镜像对称破缺过程。搅拌过程中观察到的手性超分子结构可能是由于形成了由卟啉 J-聚集体组成的手性聚集体。结构的解离分为两个步骤（快步骤和慢步骤），这可以通过搅拌停止时信号衰减率来指示。这种新方法可用于分析外部刺激诱导的手性聚集体的超分子结构变化。
