Table 2. Photophysical Properties of Compounds (10a–10d) in THFc.
comp. | absorptiona (nm) | emissiona (nm) | Stoke shift (nm) | quantum yielda | (ε/106 L mol–1 cm–1) | absorptionb (nm) | emissionb (nm) | quantum yieldb |
---|---|---|---|---|---|---|---|---|
10a | 448 | 459 | 11 | 0.28 | 24.9 | 451 | 467 | 0.21 |
10b | 451 | 463 | 12 | 0.32 | 25.7 | 454 | 464 | 0.27 |
10c | 454 | 469 | 15 | 0.57 | 25.9 | 459 | 476 | 0.38 |
10d | 451 | 478 | 27 | 0.47 | 26.3 | 462 | 498 | 0.41 |
Absorption and emission maxima in the solution state.
Absorption and emission spectra in the solid thin-film state.
Relative quantum yield of these compounds in the solution and solid state was calculated with respect to the solution of quinine sulphite in 0.1 M H2SO4 as the standard (Qf = 0.54).