To explore the causes of the different solvent dependence of emission spectra between the two conformers, we investigated the dynamical processes in their excited states using time-resolved spectroscopies. Figure compares the TR-PL spectra of the q-ax. band at 0 and 2.5 ns after photoexcitation. Figure compares the spectra of the q-eq. band at 0 and 500 ns in toluene. Figure compares the spectra of the q-ax band at 0 and 2.5 ns in THF. Figures show the decay profiles of TR-PL spectra of the q-eq. band up to 15 ns (d) and 1000 ns (e) and of the q-ax. band up to 10 ns (f) in toluene and in THF.