Photophysical properties of compounds 8 and 9 in various solvents at 3–10 μM concentrations.
| 8a (Ph) | 8b (pOMe-C6H4) | 8e (pCO2Me-C6H4) | 8f (Pyridin-4-yl) | 9a (Ph) | 9b (pOMe-C6H4) | 9e (pCO2Me-C6H4) | ||
|---|---|---|---|---|---|---|---|---|
| Water | Absa | 338 (11 000) | 343 (14 000) | 349 (8500) | 348 (6500) | 402 (7500) | 398 (9500) | 423 (6000) |
| Emb | 470 (0.4) | 468 (0.5) | —c | —c | 498 (30) | 495 (13) | —c | |
| MeOH | Absa | 341 (9500) | 343 (12 000) | 359 (7000) | 361 (6500) | 409 (7000) | 416 (7500) | 434 (5500) |
| Emb | 472 (1.9) | 460 (3.8) | 517 (0.5) | —c | 498 (30) | 528 (23) | ∼562 (2.1) | |
| CH3CN | Absa | 348 (10 500) | 352 (13 500) | 365 (7500) | 362 (6500) | 419 (7000) | 410 (9000) | 440 (6000) |
| Emb | 480 (2.8) | 468 (5.1) | 521 (1.7) | 505 (1.2) | 501 (25) | 533 (23) | 545 (5.6) | |
| EtOAc | Absa | 352 (10 000) | 353 (12 000) | 372 (7000) | 370 (6500) | 426 (8000) | 411 (8500) | 442 (6000) |
| Emb | 470 (4.5) | 461 (9.7) | 466 (6.5) | 465 (5.8) | 502 (30) | 532 (34) | 538 (6.0) | |
| Dioxane | Absa | 351 (10 500) | 351 (13 000) | 368 (7000) | 370 (6000) | 426 (7000) | 402 (9000) | 445 (6000) |
| Emb | 460 (9.3) | 456 (18) | 430 (22) | 430 (20) | 510 (62) | 530 (43) | 542 (6.0) | |
a
Peak maximum in nm (extinction coefficient in (mM cm)−1).
b
Peak maximum in nm (fluorescence quantum yield in %).
c
Non-fluorescent.