Fig. 4. (a) Solvent quenching rate constant in water and (b) in methanol as a function of the S0–S1 energy gap of each fluorophore. The colour coding of the data points is the same in (a) and (b). Black lines represent trends to the data points at energy gaps up to ∼2.1 eV. The grey line in (b) indicates the trend for kH2O determined in (a). Error bars were determined from the estimated measurement uncertainty on the fluorescence lifetime.
