, Eosin Y, 4CzIPN and 2CzPN over 24 h (Table ). At this longer reaction time it was observed that, in general, with increasing solvent polarity the yield of the target product increases. This correlates with the trend observed in the electrochemistry (Figure ); as the solvent becomes more polar, the PC Aside from the redox potentials changing as a function of solvent, the molar absorptivity of the PCs is also affected, thereby affecting the concentration of the PC* and the probability for a formation of a productive encounter complex. The ε values of the PCs at 456 nm, the excitation wavelength, are provided in Table . There is, however, no correlation between these ε values and yields. The implication of a lack of correlation where one should exist, suggests that under the reaction conditions, the rate of PET between PC* and DIPEA does not govern the product yield. Rather, the second SET, involving the challenging reduction of benzaldehyde, is more likely to the rate-limiting step in the reaction. Under our reaction conditions, the mixture is a homogeneous solution, except for Eosin Y in THF and DCM, and