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| Photoacid name | 2-Nitrobenzaldehyde | Pyranine | Merocyanine |
| Photoacid type | PAG | PAH | mPAH |
| λmax (nm) | 355 (H2O) | 410 (pH 3), 466 (pH 10) | 533 (H2O) |
| ɛmax (M −1 cm−1) | 30000 (H2O) | 8200 (pH 3), 11500 (pH 10) | 47000 (H2O) |
| pK a | 2.9 (H2O) | 7.35 (buffer) | 2.14 (H2O) |
| References | Chaves et al. (2016 ▸) | Borba et al. (2000 ▸) | Dixit & Mackay (1983 ▸), Liao (2017 ▸) |
