Table 1.
Parameters of EPR spectra, octanol–water partition coefficients (Kp), and rate constants of reduction with ascorbate for nitroxides 1, 2, 4, and 5 (for details, see the experimental part).
| Nitroxide | Solvent | Parameters of EPR Spectra | Kp (Octanol–H2O) | kRed × 104, M−1c−1 | ||
|---|---|---|---|---|---|---|
| aN, mT | aH, mT | Hp-p, mT | ||||
| 1 | H2O | 1.56 | 0.2 | 0.125 | - | 12.5 ± 0.3 |
| 20 ± 10 [19] | ||||||
| H2O-MeOH 1:1 | 1.52 | 0.202 | 0.6 ± 0.2 | |||
| 2 | H2O | 1.527 | 0.225 | 0.12 | 3.8 ± 0.5 | |
| 3.3 ± 0.8 [20] | ||||||
| H2O-MeOH 1:1 | 1.493 | 0.198 | 1.2 ± 0.1 | |||
| 4 | H2O | 1.605 | 0.214 | 0.124 | 1000 ± 250 | - |
| H2O-MeOH 1:1 | 1.529 | 0.199 | 1.7 ± 0.1 | |||
| 5 | H2O | 1.586 | 0.251 | 0.117 | 850 ± 120 | - |
| H2O-MeOH 1:1 | 1.498 | 0.248 | 0.012 ± 0.03 | |||