Table 1. Absorption and fluorescence data of the isolated compounds reported in this work.
| Compound | Absorption in THF λabs (nm) (ε, M–1 cm–1) | Fluorescence in THF |
|
| λ em (nm) | Φ FL a | ||
| E-1a | 315 (35457), 384 (19155) | 483 | 0.39 |
| 1b | 414 (21282) | 464 | 0.03 |
| 1c | 422 (24494) | 435 | 0.06 |
| 1d | 305 (16521), 374 (16133) | 480 | 0.49 |
| E-2a | 318 (32368), 382 (17130) | 484 | 0.40 |
| 2b | 415 (22839) | 462 | 0.01 |
| 2c | 422 (28856) | 471 | 0.03 |
| 2d | 306 (17036), 375 (15802) | 480 | 0.54 |
| E-3a | 321 (27864), 379 (22173) | 476 | 0.41 |
| 3b | 418 (24133) | 469 | 0.01 |
| 3c | 424 (29914) | 468 | 0.03 |
| 3d | 314 (20179), 383 (15967) | 480 | 0.41 |
| E-4a | 315 (37129), 382 (22122) | 478 | 0.43 |
| 4b | 417 (22283) | 434 | 0.01 |
| 4c | 423 (27366) | 472 | 0.02 |
| 4d | 313 (17469), 378 (14129) | 480 | 0.49 |
| E-5a | 304(27602) | 450 | 0.06 |
| E-6a | 315 (39642), 380 (27831) | 473 | 0.37 |
| 6d | 272 (19697), 294 (15720), 374 (13113) | 480 | 0.45 |
| E-7a | 325 (34151), 380 (21960) | 485 | 0.26 |
| E-8a | 318 (42807), 357 (32632) | 463 | 0.38 |
| E-9a | 333 (18568), 362 (18454), 420 (6833) | 536 | 0.65 |
aDetermined with an absolute QY spectrometer.