Figure 2.
(A) Fluorescence spectra of 3ae (10 μM) in different solvents at 25 °C with an excitation at 390 nm. (B) Fluoroscence intensity of 3bj, 3bm, 3aa, 3ae, 3al, 3ai, 3ag, and 3ak (10 μM) in THF at 25 °C at corresponding excitation. (C) Structures of compounds.