溶液中的聚集体紫外-可见光谱———以三聚茚为例拓展谱学教学内容

The UV-Vis absorption spectroscopy is a useful tool for broad applications due to its reliable accuracy. In addition to the single-molecule spectra of dyes in solution, the spectra of dyes in solution aggregated state have also gradually developed with the advancement of aggregation-induced emission (AIE). However, the phenomenon of aggregation in solution of conventional dye molecules with aggregation-caused quenching (ACQ) is often overlooked. In the textbook for undergraduates, the contents of UV-Vis absorption spectroscopy mainly focus on the relationship between single molecules’ structures and their absorption features. The characteristics of aggregates in solution are seldom discussed. Therefore, in this paper, the planar structure of truxene (ACQ dyes) and its derivatives was chosen to highlight the differences in UV-Vis spectra between single molecules and aggregates in solution, serving as a beneficial supplement for undergraduates who want to be good at UV-Vis absorption spectroscopy.