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Maximum absorption (λabs) and emission (λem) wavelengths and molar absorption coefficients (ε) for compounds 1 and 2 in several solvents.
| Solvent | λabs/nm (ε/104 M−1 cm−1) | λem/nm | ||
|---|---|---|---|---|
| Compound 1 | Compound 2 | Compound 1 | Compound 2 | |
| Chloroform | 369 (1.33) | 403 (1.05) | 425 | 523 |
| Ethyl acetate | 364 (1.41) | 405 (1.16) | 427 | 532 |
| Ethanol | 365 (1.33) | 415 (1.10) | 430 | 581 |
| Acetonitrile | 363 (1.50) | 403 (1.21) | 428 | 568 |
