Related Experiment Video
Updated: Aug 1, 2025

Confocal Microscopy Reveals Cell Surface Receptor Aggregation Through Image Correlation Spectroscopy
Published on: August 2, 2018
Restriction of crossing conical intersections: the intrinsic mechanism of aggregation-induced emission
1College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China. junrong@pku.edu.cn.
Abstract:
Elucidating the mechanism of aggregation-induced emission (AIE) is a prerequisite for designing more AIE-gens. The diphenylethylene (DPE) featured molecules are one of the most important AIE-gens due to their propeller structure. Three representative DPE-featured AIE-gens, triphenylethylene, cis-stilbene, and trans-stilbene, are explored via ultrafast ultraviolet/infrared (UV/IR) spectroscopy and theoretical calculations. Both experimental and computational results suggest that readily crossing conical intersections (CIs) with flexible structural evolutions in solutions significantly reduces fluorescence, whereas crossing CIs is restricted because of high energy cost, and therefore no fast nonradiative decay can compete with spontaneous emission in solids. The mechanism also well explains the different emission quantum yields and interconversion ratios between cis-stilbene and trans-stilbene after photoexcitation.
More Related Videos
Related Concept Videos
Cycloaddition Reactions: MO Requirements for Photochemical Activation
The Antenna Complex
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Overview of Cell-Matrix Interactions
Cycloaddition Reactions: MO Requirements for Thermal Activation
Super-resolution Fluorescence Microscopy

