UV-Vis pump-probe spectra in the 400-750 nm spectral range, have been obtained with a 525-530 nm excitation wavelength for various solvents using the transient absorption setup described in Supporting Information. All the spectra show ground state bleaching plus stimulated emission signals and an excited state absorption located at 470 nm. Spectra as a function of time have been analyzed with a global fitting approach using the glotaran programpackage and an unidirectional sequential model as the kinetic decaying scheme. This showed both dyes 7 and 8 contain only one main spectral component that relaxes back to the ground state (some representative transient absorption spectra have been reported in figure S7-S8 in Supporting Information); the additional stimulated emission increases that has been observed in the first tens of picoseconds have been ascribed to vibrational and structural relaxation. The time constants for ground state recovery are strongly solvent dependent, as suggested by fluorescence quantum yields, and are reported in Table . Measuring ground state recovery dynamics (from bleaching decay) allowed us to highlight that radiative decay constant are, as expected, solvent independent and very much similar for dyes 7 and 8 (see Table ); on the contrary, non-radiative processes are strongly influenced by solvent environment and by the position of nitro-groups. UV-Vis pump-probe data are fully in agreement with the presence of an additional excited state with a more pronounced charge separation character (CT) in the relaxation pathway. The fluorescence quantum yields measured in CHCl3 and CH2Cl2 do not follow the solvent polarity trend response observed for other solvents. Pump probe measurements evidence that ground state recovery takes place at a few hundred picoseconds for dye 7 and tens of picoseconds for dye 8. This evidence suggests that both solvents may come into specific molecular interactions with dyes 7 and 8 as a result of their low but not negligible capability, to enhance the non-radiative decay and form hydrogen-bonding with molecules in the excited electronic state. It is worth mentioning that among the various solvents used to characterize the properties of excited state compounds 7 and 8, chloroform and dichloromethane are the only ones having hydrogen bonding donor properties and are the ones where both compounds have the shortest lifetimes (no evidence of triplet state formation from pump probe data).