Table 2. Molar absorption coefficients ε species of monooximes at λmax of oximate-ion and ionization constants in aqueous solutions at different temperatures, M ± m
| Oxime | Temperature, | ε, М−1·см−1 | Ka, 10−8 М | pKa | |||||||||
| °C | Ox− | HOx | |||||||||||
| Isonitrosin | 20 | 14 680 ± 109 | 578 ± 127 | 6.10 ± 0.34 | 7.21 ± 0.02 | ||||||||
| 25 | 14 456 ± 107 | 584 ± 130 | 7.00 ± 0.40 | 7.16 ± 0.02 | |||||||||
| 37 | 14 715 ± 114 | 682 ± 147 | 9.76 ± 0.59 | 7.01 ± 0.03 | |||||||||
| Pralidoxime | 20 | 17 116 ± 231 | 372 ± 164 | 0.68 ± 0.05 | 8.16 ± 0.03 | ||||||||
| 25 | 16 663 ± 192 | 282 ± 140 | 0.77 ± 0.05 | 8.11 ± 0.03 | |||||||||
| 37 | 16 813 ± 210 | 320 ± 159 | 0.94 ± 0.07 | 8.03 ± 0.03 | |||||||||
| Asoxime | 20 | 14 531 ± 177 | 295 ± 168 | 2.57 ± 0.22 | 7.59 ± 0.04 | ||||||||
| 25 | 14 495 ± 156 | 323 ± 151 | 2.78 ± 0.21 | 7.56 ± 0.03 | |||||||||
| 37 | 14 104 ± 148 | 287 ± 158 | 4.08 ± 0.32 | 7.39 ± 0.03 | |||||||||
| Carboxime | 20 | 24 506 ± 384 | 964 ± 377 | 2.97 ± 0.34 | 7.53 ± 0.05 | ||||||||
| 25 | 24 057 ± 278 | 569 ± 280 | 3.39 ± 0.22 | 7.47 ± 0.03 | |||||||||
| 37 | 24 091 ± 316 | 615 ± 343 | 4.34 ± 0.42 | 7.36 ± 0.04 | |||||||||