“…In this case, the generated CT state has a larger dipole (and higher energy in non-polar media) than the CT states formed when the anion migrates from the vicinity of the acceptor toward the donor, accompanying the HT. 122,123 Overall, the relative magnitudes of k CT , k CTT and k TICT (Scheme 1(b)), which depend on medium polarity and viscosity, govern the appearance of the ThT fluorescence spectra upon excitation at 350 nm (Fig. 3(b)).…”