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Association constants, log Ka, for the 1 : 1 host–guest complexes formed from the neutral and cation-bound forms of receptor 30 and selected anionsa
| Host | NO3− | CF3SO3− | BF4− |
|---|---|---|---|
| 30 | 1.88 ± 0.03 | 1.40 ± 0.20 | b |
| 30·Ag+ | 3.31 ± 0.07 | 3.40 ± 0.07 | b |
| 30·Na+ | 3.82 ± 0.15 | 3.32 ± 0.11 | 3.46 ± 0.11 |
| 30·Ag+·Na+ | 5.07 ± 0.17 | 4.70 ± 0.20 | 4.28 ± 0.11 |
Determined by 1H NMR spectroscopy (400 MHz, CDCl3/CD3CN (9 : 1), [host] = 2.0 × 10−3 M).
Not determined due to the small chemical shift change.
