The oxidative scan shows that the third and second reductions are mostly irreversible while the first reduction still retains some of its reversibility. However, the reversibility of the first reduction is also dependent on the scan rate and loses reversibility when scanning into the second and third reductions (Figures and). At scan rates higher than 10 mVs -1 a new oxidation peak was observed; this oxidation appears to be relatively fast compared to the other redox processes of BTDN with CO2. The signal is wide and undefined but occurs in the range of -0.20 to 0.45 V vs Fc 0/+ . Table . Peak currents and current ratios between the three reduction peaks with the third reduction at -2.4 V vs Fc 0/+ , at different scan rates for 0.2 mM BTDN saturated with CO2 in 0.1 M TBAPF6 in acetonitrile.