To investigate the different species that form at each reduction event, spectroelectrochemistry (SEC) was utilized, in both the spectral regions of UV-Vis and IR. In the UV-Vis SEC data (Figures 2, S7 and S16-S18) can be seen, and it is clear that a different reaction with CO2 occurs at each reduction. Even at the first reduction, there are obvious spectral differences compared to well-known singly reduced BTDN radical anion (BTDN •-, Figure ). different from the BTDN 2-species forming in the absence of CO2. The UV-Vis SEC data also shows that there are different reactions occurring at all three reduction potentials with clear differences in the features in both the 350-450 nm range and 200-300 nm range.