Table 1.
Spectroscopic properties and singlet oxygen quantum yields in acetonitrile and aqueous solution.
| Spectroscopic properties | Singlet oxygen quantum yield/% | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| λabs/nm (ε/M−1 cm−1 × 10−3) | σ2/GM | λem/nm | Φem/% | τ air/ns | τ degassed/ns | Direct 450 nm CH3CN |
Direct 450 nm D2O | Indirect 450 nm CH3CN |
Indirect 450 nm PBS |
Indirect 540 nm CH3CN |
Indirect 540 nm PBS |
|
| 1 | 300 (81.6), 385 (111.6), 515 (47.8) | 147 | 677 | 1.9 | 86 | 385 | 65 | n.d. | 66 | 5 | 61 | 3 |
| 2 | 305 (109.5), 425 (133.4), 495 (111.8) | 2175 | 709 | >0.1 | 48 | 222 | 18 | n.d. | 25 | 3 | 16 | 1 |
| 3 | 305 (96.6), 370 (152.3), 495 (63.9) | 573 | 682 | 1.1 | 76 | 338 | 52 | n.d. | 48 | 6 | 49 | 5 |
| 4 | 290 (57.0), 425 (93.5), 485 (82.6) | 838 | 703 | 0.4 | 69 | 417 | 34 | n.d. | 40 | 2 | 37 | 3 |
| 5 | 295 (76.9), 360 (99.8), 475 (39.5) | 313 | 674 | 1.4 | 36 | 231 | 54 | n.d. | 51 | 8 | 46 | 6 |
| 6 | 290 (79.0), 415 (57.3), 460 (61.4) | 349 | 697 | 0.5 | 54 | 405 | 46 | n.d. | 53 | 2 | 38 | 2 |
| 7 | 290 (95.7), 365 (64.8), 465 (34.4) | 263 | 664 | 2.8 | 96 | 542 | 75 | n.d. | 77 | 11 | 68 | 10 |
Average of three independent measurements.
λabs absorption maximum, σ2 2P absorption cross section, λem emission maximum, Φem luminescence quantum yield, τ excited state lifetime, n.d. not detectable.