Table 1. Optical properties of 5a, 9b and their oxidized states.
Absorption
a
|
Emission
a
|
|||||
λ max (ε) nm (103 M–1 cm–1) | HLG b eV | λ 0–0 nm | Stokes shift cm–1 | Φ F c | τ F d ns | |
5a | 595 (0.9), 550 (2.4), 520 (2.7), 450 e , 430 (11.8) | 2.08 | 630 (615) | 678 | 0.005 | 4.1 |
5a+ | 2050 (5.9), 1560 (6.0), 1285 (9.3), 1120 (8.8), 805 (7.9), 658 (6.8), 516 (10.8), 484 (12.5) | 0.60 | ||||
5a2+ | 1525 (10.3), 1270 (10.3), 1080 (18.3), 656 (12.8), 566 (15.3), 520 (20.0), 498 (20.5) | 0.81 | ||||
9b | 475 e | 2.61 | ∼520 e (510) | 926 f | 0.006 | 5.9 |
9b+ | 1540, 1275, 1090, 712, 647, 586 | 0.81 | ||||
9b2+ | 1530 (1.5), 1140 (24.0), 1020 (17.4), 705 (13.6), 572 (10.6), 439 (22.8) | 0.81 |
aIn dichloromethane solutions.
bOptical HOMO–LUMO gap determined from the lowest energy band.
cFluorescence quantum yield.
dFluorescence decay time.
eShoulder.
fDetermined from emission and excitation spectra at 77 K.