Luminescent Molecular Switches Based on Dicationic P-Doped Polycyclic Aromatic Hydrocarbons

We report the efficient synthesis of electron-acceptors based on cationic P-doped PAHs (Polycyclic Aromatic Hydrocarbons). Both endo- and exo-skeletal modifications of the p-core allow fine-tuning their optical and redox properties. Combined experimental (spectrolectrochemical and Electron Paramagnetic Resonance) and theoretical studies provide an in-depth characterization of the reduced species and specifically of the stable radical cations formed. Finally, electrochemical modulation of fluorescence highlights the potential of these intrinsically switchable electroactive fluorophores.