Table 1. Photophysical Data of 6-BgCoum, 7-BgCoum, 8-BgCoum, and 9-BgCoum Measured in Solution and in Crystalline State.
| solventa | Φf (Φf SW, Φf LW) [%] | τ [ns] | kr·10–7 [s–1] | knr·10–7 [s–1] |
|---|---|---|---|---|
| 6-BgCoum | ||||
| n-hexane | 50.5 | 13.4 | 3.76 | 3.69 |
| toluene | 26.1 | 6.0 | 4.33 | 12.3 |
| DCM | 3.5 | 0.9 | 12.2 | 96.7 |
| THF | 5.9 (0.2, 11.2) | 1.0 | 3.35 | 91.9 |
| ACN | 0.6 | 0.2 | 2.94 | 465.0 |
| DMSO | 0.7 | 0.19 | 3.67 | 519 |
| DMF | 0.7 | 0.24 | 2.92 | 415 |
| propyl butyrate | 0.1 (0.02, 0.91) | 2.4 | 0.38 | 41.3 |
| SOA | 5.6 (0.21, 5.8) | 7.16 | 0.81 | 13.2 |
| 7-BgCoum | ||||
| n-hexane | 14.4 | 13.1 | 1.10 | 6.54 |
| toluene | 8.9 | 9.9 | 0.82 | 9.27 |
| DCM | 0.62 (0.1, 3.9) | 1.5 | 1.38 | 63.3 |
| THF | 0.95 (0.02, 2.1) | 3.9 | 0.99 | 24.7 |
| DMSO | ||||
| DMF | ||||
| propyl butyrate | 0.54 (0.2, 0.13) | 5.27 | 0.02 | 19.0 |
| SOA | 2.1 (0.39, 0.61) | 12.8 | 0.05 | 7.8 |
| 8-BgCoum | ||||
| n-hexane | 11.0 | 0.76 | 14.0 | 118.0 |
| toluene | 98.0 | 4.2 | 23.0 | 0.3 |
| DCM | 99.9 | 4.65 | 21.5 | 0.02 |
| THF | 95.0 | 4.76 | 20.0 | 1.1 |
| ACN | 86.0 | 4.8 | 17.0 | 2.9 |
| DMSO | 73.2 | 4.18 | 17.5 | 6.4 |
| DMF | 72.9 | 4.28 | 17.0 | 6.33 |
| propyl butyrate | 34.0 | 4.38 | 7.8 | 15.1 |
| SOA | 49.2 | 4.24 | 11.6 | 12.0 |
| 9-BgCoum | ||||
| n-hexane | 8.3 | 6.3 | 1.31 | 14.5 |
| toluene | 0.90 | 1.6 | 0.55 | 62.6 |
| DCM | 0.09 (0.003, 0.11) | 2.8 | 0.27 | 35.0 |
| THF | 0.08 (0.006, 0.09) | 2.6 | 0.031 | 38.22 |
| DMSO | ||||
| DMF | ||||
| propyl butyrate | 0.03 (0.01, 0.01) | 0.70 | 0.02 | 142.8 |
| SOA | 0.80 (0.12, 1.2) | 5.85 | 0.21 | 16.9 |
a
Onsager polarity, fO(ε, n2), of the used solvents: hexane—0.00, toluene—0.03, sucrose octaacetate (SOA)—0.27, propyl butyrate—0.30, tetrahydrofuran (THF)—0.41, dichloromethane (DCM)—0.43, acetonitrile (ACN)—0.46, dimethyl sulfoxide (DMSO)—0.53, N,N-dimethylformamide (DMF)—0.55. fO(ε, n2) = fO(ε) – fO(n2), where fO(x) = 2(x – 1) (2x + 1)−1.