TABLE 1.
Spectral Properties and Fluorescence Quantum Yield (ϕF) of the Stilbene Derivatives in Water/Methanol 1:1 (v/v) at Room Temperature
| λabs (nm) |
ε (M−1 cm−1) |
λF (nm) |
Δa (cm−1) |
ϕF | |
|---|---|---|---|---|---|
| STb | 296 (295)c |
33 800 (31 500) |
348 (349) |
5100 (5250) |
0.021 (0.044) |
| STBA | 314 (317) |
39 700 (31 300) |
358 (359) |
3950 (3690) |
0.009 (0.054) |
| CSTBA | 327 (330) |
47 300 (34 900) |
385 (373) |
4600 (3500) |
0.006 (0.013) |
| MSTBA | 324 (325) |
38 000 (25 700) |
391 (370) |
5320 (3750) |
0.025 (0.31) |
| DSTBA | 346 (347) |
32 800 (36 500) |
485 (400) |
8300 (3820) |
0.088 (0.64) |
a
Δ: Stokes shift.
b
ST: trans-stilbene.
c
In cyclohexane.