Table 2.
Half-Wave Potentials (E1/2), Peak-to-Peak Potentials (ΔEp), and Comproportionation Constants (Kc) for the DMF, MeCN, and Cyanide Adducts Extracted from Their Cyclic Voltammograms and Diffusion Coefficients (D0) Obtained by Applying the Randles–Sevcik Equation
| redox couple nred/nox |
E1/2 (V vs Fc0/+)
|
ΔEp (mV)
|
D0 (10−5 cm2/s)
|
n |
Kc
|
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MeCN | DMF | CNa | MeCN | DMF | CNa | DMFb | CNb | MeCN | DMF | CNa | ||
| 5/6 | – | – | (0.33) | – | – | (127) | – | – | 5 | – | – | (1.7 × 1012) |
| 4/5 | – | −0.27 | −0.45 (−0.39) | – | 82 | 83 (113) | 2.3 (2.4) | 2.8 (2.6) | 4 | – | 4.8 × 106 | 2.5 × 1020 (0.3 × 1019) |
| 3/4 | −0.72 | −0.67 | −1.66 (−1.53) | 134 | 78 | 87 (125) | 2.8 (2.2) | 2.6 (2.8) | 3 | 3.2 × 104 | 3.0 × 104 | – |
| 2/3 | −0.99 | −0.93 | – | 66 | 79 | – | 2.6 (2.6) | – | 2 | 7.0 × 102 | 1.3 × 105 | – |
| 1/2 | −1.22 | −1.23 | – | 61 | 79 | – | 2.6 (2.8) | – | 1 | 4.5 × 105 | 1.3 × 106 | – |
| 0/1 | −1.55 | −1.58 | – | 60 | 81 | – | 2.7 (2.9) | – | 0 | 1.8 × 108 | 1.5 × 108 | – |
| −1/0 | −2.04 | −2.06 | – | 92 | 88 | – | 2.6 (2.6) | – | −1 | – | 3.0 × 1015 | – |
a
Values without and with parentheses are for the cyclic voltammograms recorded in DMF and PC, respectively.
b
Values without and with parentheses are for the cathodic and anodic scans, respectively.