Table 2. Apparent Ionization Constants of the Dyes 3b and 4 in H2O/DMSO Solutions.
| dye | H2O/DMSO(v/v) | pKa |
|---|---|---|
| 3b | 1/5 | 13.7 ± 0.1 |
| 4 | 1/3 | 15.2 ± 0.2 |
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