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Scn-binding constants calculated from fluorescence quenching analyses with different metal complexes at pH 7.4
| Ent Complex | Kd, nM (SD) | HOPO complex | Kd, nM (SD) |
| [FeIII(Ent)]3- | 0.4 (ref. 22) | ||
| [SmIII(Ent)]3- | 7(2) | [SmIII(HOPO)]− | 13(3) |
| [EuIII(Ent)]3- | 8(2) | [EuIII(HOPO)]− | 14(1) |
| [GdIII(Ent)]3- | 5.4(4) | [GdIII(HOPO)]− | 18(2) |
| [ThIV(Ent)]2- | 13(5) | [ThIV(HOPO)] | no binding |
| [PuIV(Ent)]2- | 0.09(1) | [PuIV(HOPO)] | 110(21) |
| [AmIII(Ent)]3- | 0.24(5) | [AmIII(HOPO)]− | 29(1) |
| [CmIII(Ent)]3- | 0.20(9) | [CmIII(HOPO)]− | 22(5) |
