Table 2.
The protonation constants of free ligands and stability constants of formed Cu(II)-complexes. The errors are represented by ± SD.
| 9a | 10a | |||
|---|---|---|---|---|
| Form | logβ | logK | logβ | logK |
| The protonation constants of free ligands | ||||
| H3L | 25.31 ± 0.01 | 7.26 | 25.38 ± 0.02 | 6.85 |
| H2L | 18.05 ± 0.01 | 7.96 (-NH2) | 18.53 ± 0.02 | 8.11 (-NH2) |
| HL | 10.09 ± 0.01 | 10.09 | 10.42 ± 0.01 | 10.42 |
| The stability constants of Cu(II)-complexes | ||||
| CuLH2 | 23.52 ± 0.03 | 9.34 | 23.83 ± 0.03 | 8.83 |
| CuL | 14.18 ± 0.01 | 10.42 | 15.00 ± 0.01 | 10.61 |
| CuLH-1 | 3.76 ± 0.04 | - | 4.39 ± 0.03 | - |
| Cu2L2H | 36.61 ± 0.03 | 14.45 | 37.54 ± 0.06 | 14.59 |
| Cu2L2H-1 | 22.16 ± 0.06 | - | 22.95 ± 0.06 | - |
| CuL2H2 | 36.46 ± 0.04 | 7.67 | - | - |
| CuL2H | 28.79 ± 0.04 | 8.73 | 28.82 ± 0.11 | 8.45 |
| CuL2 | 20.06 ± 0.04 | 11.35 | 20.37 ± 0.05 | - |
| CuL2H-1 | 8.71 ± 0.07 | - | - | - |