Table 1. Photophysical Properties of DPA and Dimers.
| E0–0 (nm)a | λem (nm)b | ϕf | τf (ns)c | |
|---|---|---|---|---|
| DPA | 393 (13.6) | 409 | 1.00 | 6.91 |
| 9,9′-PA2 | 402 (35.0) | 431 | 1.00 | 6.56 |
| 1,2-DPA2 | 403 (17.3) | 511 | 0.95 | 7.32d, 44.0e |
| 1,3-DPA2 | 398 (27.7) | 411 | 0.96 | 5.85 |
| 1,4-DPA2 | 398 (26.7) | 416 | 0.95 | 4.56 |
a
Wavelength of 0 → 0 transition and molar absorptivity, ε (×103 M–1 cm–1).
b
Wavelength of maximum emission upon 377 nm excitation at 295 K.
c
Fluorescence lifetime probed at 410 nm and 295 K.
d
Probed at 410 nm and 93 K.
e
Probed at 510 nm and 295 K.