The substituent effect on the excited state intramolecular proton transfer of 3-hydroxychromone
Song Yuzhi, Liu Songsong, Lu Jiajun, Zhang Hui, Zhang Changzhe, Du Jun
       

Absorption and emission spectra of (a) FM, (b) BFM, (c) BFBC, and (d) CCM (the values in parentheses are experimental data).