Table 3.
Overall complex-formation constants (logβ) of DFOB with alkaline earth metal ions under different experimental conditions. The constants in parentheses correspond to the formation of the 1:1 complex of M(II) with DFOB protonated at its amino group and therefore refer to the equilibrium: M2+ + HL2− = MHL.
| [MH3L]+ | [MH2L]+ | [MHL] | [ML]− | [M3H-3L] | I (mol·dm−3) | Background Electrolyte | T (°C) | Ref. | |
|---|---|---|---|---|---|---|---|---|---|
| Be(II) | 27.63 | 22.17 | - | - | 5.85 | 0.10 | NaClO4 | 25.0 | [21] |
| Mg(II) | - | - | 15.30 | (4.30) | - | 0.10 | NaNO3 | 20.0 | [5] |
| - | 23.85 | 14.66 | 2.8 | - | 0.20 | KCl | 25.0 | [20] | |
| Ca(II) | - | - | 13.64 | (2.64) | - | 0.10 | NaNO3 | 20.0 | [5] |
| - | 22.41 | 13.25 | 3.03 | - | 0.20 | KCl | 25.0 | [20] | |
| Sr(II) | - | - | 13.20 | (2.20) | - | 0.10 | NaNO3 | 20.0 | [5] |