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Table indicating the standard concentrations to use for the titrations along with the relevant UV–vis spectral data.
| Derivative | Concentration (× 10−4 mol·L−1) |
λmax of acid (nm) | ε of acid (mol·L−1·cm−1) | λmax of deprotonated acid (nm) | ε of deprotonated acid (mol·L−1·cm−1) |
| 6 | 3 | 296 | 7640 | 332 | 38660 |
| 1 | 2.5 | 308 | 6753 | 332 | 4265 |
| 2 | 1.5 | 292 | 34240 | 304 | 2069 |
| 3 | 2 | 348 | 1298 | 308 | 19790 |
| 4 | 2 | 316 | 6242 | 304 | 10720 |
| 5 | 4 | 292 | 2324 | 296 | 3595 |
