Figure 5.

Fluorescence lifetime modulation by intramolecular and intermolecular interactions. (a) 4 with steric repulsion had weak interaction, and 24 with charged substituents had weak interaction. (b) Structures of 39 and 40, and fluorescence decay curves of 39 (blue) and 40 (red) in the solid state. (c) Structures and fluorescence lifetimes of 36, 37, and 38 in THF (black) and solid state (red). (b) Reprinted with permission from ref (30). Copyright 2018, Royal Society of Chemistry. (c) Reprinted with permission from ref (29). Copyright 2023, Multidisciplinary Digital Publishing Institute.