Summary of cyclic voltammetry data obtained for dinuclear iron(ii) helicates, 1–5, in MeCN (0.1 mol L−1 TBAClO4 unless indicated with * in which case, for solubility reasons, 0.1 M TBAPF6 was used) versus 0.01 mol L−1 Ag/AgNO3 at 200 mV s−1, along with the T1/2 and γHS(298 K) in MeCN solution, and the Δo for the nickel(ii) analogues.
| Complexes | Epa (V) | Epc (V) | Em (ΔE) (V) | T1/2 (K) | γHS 298 K | Δo (cm−1) (Ni2L3) |
|---|---|---|---|---|---|---|
| L2NHIm-meta (1·4H2O) | 0.44 | 0.34 | 0.39 (0.10) | 331 | 0.33 | 11 505 |
| L4NHIm-meta (2·6H2O) | 0.33 | 0.22 | 0.27 (0.11) | 267 | 0.61 | 11 420 |
| L4NMeIm-meta (3·5H2O) | 0.30 | 0.20 | 0.25 (0.10) | 247 | 0.81 | 11 430 |
| L4OIm-meta (4·6H2O) | 0.78 | Irrev | Irrev | 249 | 0.81 | 11 516 |
| *L4SIm-meta (5·2.5H2O) | 0.73 | 0.61 | 0.67 (0.12) | 471 | 0 | 11 804 |