Table 1.
Photophysical Propertiesa
| Compound | λmax, nm (ε, M−1cm−1) | Φlum, % (λmax, nm) |
Φrxn, % | τair (μs)b | τN2 (μs)c |
|---|---|---|---|---|---|
| PTA-1 | 226 (35900 ± 2600), 225 (22300 ± 600), 274 (26400 ± 1900), 368 (3200 ± 300) | <0.1 (n.d.) | 0.06 | n.d. | n.d |
| THP-1 | 226 (36800 ± 1300), 275 (26800 ± 900), 322 (6400 ± 200), 366 (3600 ± 100) | 5.1 ± 1.1 (528) | 1.4 ± 0.4 | 1.5 | 4.8 |
| DAPTA-1 | 225 (41600 ± 7300), 275 (27200 ± 4900), 323 (5700 ± 900), 367 (3200 ± 400) | 10.7 ± 0.6 (516) | 1.1 ± 0.1 | 1.9 | 5.6 |
| PTA-2 | 228 (40500 ± 1100), 253 (26100 ± 600), 283 (26200 ± 600), 372 (2500 ± 300) | <0.1 (n.d.) | 0.015 | n.d. | n.d |
| THP-2 | 228 (34600 ± 1200), 286 (23400 ± 800), 308 (11900 ± 400), 372 (2100 ± 70) | 4.5 ± 0.4 (518) | 2.0 ± 0.4 | 1.0 | 3.7 |
| DAPTA-2 | 227 (36800 ± 6800), 285 (23800 ± 700), 309 (11500 ± 300), 373 (2100 ± 50) | 7.2 ± 0.2 (507) | 1.5 ± 0.1 | 2.0 | 7.8 |
| PTA-3 | 248 (24400 ± 800), 307 (11700 ± 500), 319 (12900 ± 500), 349 (3300 ± 300) | <0.1 (538) | 0.0044 | n.d. | n.d. |
| THP-3 | 222 (18900 ± 200), 249 (20100 ± 1900), 308 (10700 ± 400), 318 (12500 ± 400), 343 (3600 ± 700) | 6.1 ± 1.7 (536) | 1.6 ± 0.1 | 0.4 | 0.5 |
| DAPTA-3 | 246 (22600 ± 500), 308 (10700 ± 200), 319 (13000 ± 300), 345 (3400 ± 100) | 9.1 ± 3.0 (528) | 2.3 ± 0.5 | 0.6 | 0.8 |
| PTA-4 | 252 (29200 ± 3600), 303 (13600 ± 1800), 315 (14700 ± 2100), 345 (4300 ± 500) | <0.1 (530) | 0.021 | n.d. | n.d. |
| THP-4 | 252 (24000 ± 3000), 304 (11800 ± 1500), 315 (13400 ± 1700), 338 (4600 ± 500) | 6.5 ± 2.0 (528) | 3.8 ± 0.9 | 0.4 | 0.6 |
| DAPTA-4 | 250 (8200 ± 4300), 305 (12800 ± 2000), 315 (14900 ± 2300), 339 (4000 ± 400) | 11.5 ± 3.9 (518) | 5.5 ± 0.3 | 0.6 | 1.0 |
| PTA-5 | 227 (36100 ± 2600), 249 (32900 ± 2300), 304 (9800 ± 700), 338 (4400 ± 300) | <0.1 (520) | 0.018 | n.d. | n.d. |
| THP-5 | 223 (33900 ± 1000), 251 (30500 ± 900), 303 (8800 ± 300), 337 (4500 ± 80) | 3.4 ± 1.1 (537) | 1.2 ± 0.2 | 0.3 | 0.4 |
| DAPTA-5 | 224 (41400 ± 2000), 251 (34100 ± 1900), 303 (9600 ± 500), 332 (4700 ± 300) | 7.1 ± 3.0 (527) | 1.9 ± 0.1 | 0.4 | 0.6 |
a
n.d. = not determined due to weak or undetectable luminescence intensity.
b
Luminescence lifetime measured in air-equilibrated pH 7.4 PBS.
c
Luminescence lifetime measured in nitrogen-saturated pH 7.4 PBS.