Table 7. Fluorescence decay of the K2T23 enol conformers.
| Solvent | τ1 (f1) | τ2 (f2) | τ3 (f3) | τ4 (f4) |
|---|---|---|---|---|
| Cyclohexane | ≤30 ps (19 ± 2) (.72) | 99 ± 2 (.24) | 535 ± 12 (.02) | 3005 ± 12 (.01) |
| Chloroform | ≤30 ps (21 ± 1) (.75) | 103 ± 1 (.24) | 480 ± 13 (.01) | 4112 ± 90 (<.01) |
| Dichloromethane | ≤30 ps (26 ± 1) (.77) | 111 ± 2 (.22) | 462 ± 13 (.01) | |
| Acetonitrile | ≤30 ps (29 ± 1) (.78) | 116 ± 2 (.21) | 501 ± 15 (.01) | |
| Dimethylformamide | 51 ± 3 (.74) | 125 ± 14 (.25) | 428 ± 64 (.01) | 4520 ± 515 (<.01) |
| Dimethylsulfoxide | 94 ± 1 (.97) | 461 ± 24 (.03) | 4281 ± 180 (<.01) | |
| Isopropanol | ≤30 ps (28 ± 2) (.60) | 91 ± 3 (.38) | 336 ± 8 (.02) | 4197 ± 177 (<.01) |
| Ethanol | ≤30 ps (34 ± 1) (.67) | 100 ± 2 (.31) | 355 ± 9 (.02) | |
| Methanol | ≤30 ps (29 ± 1) (.68) | 95 ± 1 (.30) | 322 ± 8 (.02) |
Decay times and relative amplitudes of K2T23 in the Table 1 solvents upon excitation at 420 nm.