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Overall stability constants for the complexes formed in the Fe(III)-Im-4-Cha, Fe(III)-N-Me-Im-4-Cha and Fe(III)-Im-4-Aha systems* I = 0.2 M (KCl), t = 25°C.
| Ligands | Im-4-Cha | N-Me-Im-4-Cha | Im-4-Aha |
|---|---|---|---|
| [FeLH]3+ | 12.1(2) | 13.95(3) | 15.62(2) |
| [FeL]2+ | 10.46(1) | 11.92(4) | — |
| [FeL2H2]3+ | — | — | 30.11(2) |
| [FeL2]+ | 18.65(4) | 23.04(4) | — |
| [FeL2H−1] | — | 18.8(1) | — |
| [FeL3H3]3+ | — | — | 43.47(6) |
| [FeL3H2]2+ | — | — | 38.17(4) |
| [FeL3H]+ | — | — | 31.99(5) |
| FeL3 | — | 31.3(2) | 24.97(5) |
*Standard deviations are shown in parenthesis.
