Table 2.
Oxidation and reduction half‐wave potential values [mV] measured by CV for 1–4 (10−3 m) in acetonitrile ([TBA][PF6]; 10−1 m) at a Pt electrode (Ø=1.5 mm, ν=0.1 V s−1), E, versus the ferrocene/ferrocenium redox couple (Fc/Fc+). Redn and Oxn represent the n successive reduction and oxidation processes observed in the tested electrochemical window.
| Dye | Y | Reduction | Oxidation | |||||
|---|---|---|---|---|---|---|---|---|
| Red1 | ΔE(Red1)[a] | Red2 | Ox1 | ΔE(Ox1)[a] | Ox2 | |||
| 1 | H | −1359 | 0 | – | 992[b] | 0 | – | |
| 2 | NO2 | −1109 | −250 | −1690 | 1383[c] | 391 | – | |
| 3 | CHO | −1140 | −219 | – | 1258[b] | 266 | – | |
| 4 | NH2 | −1250 | −109 | – | 333[b] | −659 | 600[c] | |
[a] Potential difference relative to the first reduction or oxidation waves of reference compound 1. [b] Not a fully reversible process. [c] Irreversible process.