Table 1. Cyclic Voltammetry (CV) and Square Wave (SW) data for compounds 1, 4–7 a .
| Compound | 1st reduction |
2nd reduction |
3rd reduction |
4th reduction |
||||
| CV, E1/2/V | SW/V | CV, E1/2/V | SW/V | CV, E1/2/V | SW/V | CV, E1/2/V | SW/V | |
| 1 | –0.96 (0.07) | –0.97 | –1.15 (0.07) | –1.16 | — | — | ||
| 4 | –0.93 (0.08) | –0.94 | –1.07 (0.07) | –1.07 | –1.25 (0.07) c | –1.25 c | — | |
| 5 | b | –0.88 d | –1.12 (0.07) | –1.11 | –1.28 (0.08) | –1.28 | b | –1.40 |
| 6 | –0.94 (0.07) | –0.97 | –1.12 (0.06) | –1.14 | — | — | ||
| 7 | –0.99 (0.07) | –0.99 | –1.39 (0.06) | –1.40 | — | — | ||
aRecorded in CH2Cl2 containing [nBu4N][BF4] (0.4 M) as supporting electrolyte, at ambient temperature. Potentials quoted at 0.10 V s–1 against E1/2 Fc+/Fc. Values in brackets are ΔE (= Eap – Ecp).
bPeak potentials were not resolved (see square voltammetric data).
cCorresponding to the formation of [4]4–.
dAdditional unresolved shoulder to negative potential.