Table 1.
Luminescence lifetimes and number of bound waters (q) for Eu(III) complexes.
| complex | Excitation wavelength (nm) | Anion | [Anion] (mM) for lifetime | τH2O (ms) | τD2O (ms) | qe |
|---|---|---|---|---|---|---|
| Eu(S-THP) | 579.36 | Phosphatea | 1.0 | 0.271 | 0.893 | 0.64 |
| Eu(S-THP) | 579.36 | Phosphatea | 20 | 0.310 | 1.12 | 0.34 |
| Eu(S-THP) | 579.36 | MMPa | 1.5 | 0.249 | 0.808 | 0.88 |
| Eu(S-THP) | 579.36 | MMPa | 20 | 0.298 | 1.03 | 0.41 |
| Eu(S-THP) | 579.36 | Carbonateb | 40 | 0.267 | 0.856 | 0.64 |
| Eu(S-THP) | 579.36 | Acetateb | 40 | 0.280 | 0.911 | 0.50 |
| Eu(S-THP) | 579.36 | L-lactateb | 40 | 0.271 | 0.860 | 0.56 |
| Eu(S-THP) | 579.54 | Citratec | 1.0 | 0.333 | 1.10 | 0.070 |
| Eu(THPC) | 579.60 | Citrated | 0.70 | 0.323 | 1.45 | 0.76 |
| Eu(THPC) | 579.54 | Phosphated | 10 | 0.284 | 0.785 | 0.69 |
All samples contain 0.100 M NaCl, 20 mM HEPES at pH 7.2. Eu(S-THP) concentrations were: (a) 0.100 mM, (b)1.00 mM, (c) 25 μM, (d) Eu(THPC) was 25 μM. e. reported q values are ± 10% based on errors in luminescence lifetime measurements as reported in reference 21.