Table 1.
Mn2+ and Ca2+ affinities and spectroscopic properties of ligands.
| logK |
selectivity log(KMn/KCa) |
λ
max |
ϕ
f |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ligands | Mn2+ | Ca2+ | Mg2+ | Zn2+ | Free ligand |
Mn2+ complex |
Ex | Em | Free ligand |
Mn2+ Complex |
|
| BAPTA | 9.14 | 6.89 | 1.69 | 9.41 | 2.25 | 290(4.8)[a] | 278 (4.5) | -- | -- | -- | -- |
| 1 | 8.62 | 3.79 | 0.76 | 9.19 | 4.83 | 286 (6.3) | 283 (4.1) | -- | -- | -- | -- |
| 2 | 7.01 | 2.96 | 0.42 | 6.16 | 4.05 | 493 (84) | 493 (100) | 493 | 519 | 0.10 | 0.37 |
| 3 | 8.00 | 3.33 | 0.93 | 7.09 | 4.68 | 507 (80) | 507 (92) | 505 | 530 | 0.13 | 0.49 |
[a]
In parentheses is the corresponding molar absorption coefficient ε in units of 103 L mol−1 cm−1.