Table 3. Electrochemical Potentials of Compounds 1a–f (C = 1 × 10–4 mol L–1) in MeCN Measured by CV Relative to Ag/AgCl/KCl (sat.) in the Presence of 0.1 M Bu4NClO4 on a GC Electrode (Potential Sweep Rate of 200 mV s–1) and Frontier Orbital Energies Calculated by Quantum Chemistry.
| R1, R2 | Ered, V | EA, eV | ΔEred, mV (ΔEA)a | Eox, V | IP, eV | ΔEox, mV (ΔIP)b | ΔE = Eox – Ered, V | EA–IP, eV | |
|---|---|---|---|---|---|---|---|---|---|
| 1a | H, H | –1.38 | 2.642 | 0 | 2.02 | 6.291 | 0 | 3.40 | 3.649 |
| 1b | OMe, H | –1.51 | 2.513 | 130 (129) | 1.52 | 5.840 | 500 (451) | 3.03 | 3.327 |
| 1c | SMe, H | –1.39 | 2.618 | 10 (24) | 1.33 | 5.724 | 690 (567) | 2.72 | 3.106 |
| 1d | OMe, OMe | –1.46 | 2.524 | 80 (118) | 1.53 | 5.695 | 490 (596) | 2.99 | 3.171 |
| 1e | NMe2, H | –1.63 | 2.316 | 250 (326) | 0.87 | 5.098 | 1150 (1193) | 2.50 | 2.782 |
| 1f | NEt2, H | –1.64 | 2.304 | 260 (338) | 0.86 | 5.059 | 1160 (1232) | 2.50 | 2.755 |
Shift of the reduction potentials relative to those of 1a.
Shift of the oxidation potentials relative to those of 1a.