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Redox and peak separation potentials of 1b in the solid state compared to 2b. The HOMO–LUMO gap was determined from the difference in the onsets for the reduction and first-oxidation processes.
| Entry | E1½ (V) | ΔE1a–c (mV) | E2½ (V) | ΔE2a–c (mV) | HOMO–LUMO gap (eV) |
| 2b | +0.73 | 340 | +0.95 | 170 | 2.2 |
| 1b | +0.56 | 290 | +0.74 | 270 | 2.1 |
