Table 4.
Triplet properties of investigated compounds in solvents of different polarity: absorption maximum (λT) and triplet lifetime in the presence (τT,AIR) and absence (τT,N2) of molecular oxygen with the relative quenching constant (kOX); molar absorption coefficient (εT) and triplet quantum yield (ΦT), kinetic constant (given by kT = ΦT/τS1); singlet oxygen quantum yield (Φ∆).
| Compound | Solvent | λT/nm | τT,AIR/μs | τT,N2/μs | kOX/109 s−1 | εT */M−1 cm−1 | ΦT | kT/108 s−1 | ΦΔ |
|---|---|---|---|---|---|---|---|---|---|
| DMA-QP | Tol | 460 | 0.23 | 4.63 | 4.2 | 5900 | 0.11 | 12 | |
| DMF | 450 | 0.09 | 3.14 | 0.28 | <0.05 | ||||
| DMA-QF | Tol | 650 | 0.09 | 0.41 | 8.8 | 4500 | 0.41 | 4.9 | |
| DMF | 600 | 0.13 | <0.01 | ||||||
| DMA-QT | Tol | 610 | 0.135 | 16.4 | 7.5 | 26,600 | 0.80 | 9.6 | 0.69 |
| DMF | 610 | 0.22 | 14.8 | 11.5 | 0.43 | 5.1 | 0.73 |
* In CH.