Table 1. Spectroscopic properties for the coumarin dyes in different mediaa
Dye |
medium |
l a (nm) |
l f (nm) |
F f |
P (r) d |
1 |
30% EtOH |
454 |
498 |
0.52 |
0.071 (0.037) |
|
30% EtOH (H+)b |
479 |
513 |
0.25 |
0.241 (0.182) |
|
PMAA (H+)c |
474 |
508 |
0.33 |
0.336 (0.222) |
2 |
30% EtOH |
425 |
489 |
0.25 |
0.134 (0.094) |
|
30% EtOH (H+)b |
450 |
504 |
0.13 |
0.254 (0.185) |
|
PMAA (H+)c |
448 |
492 |
0.43 |
0.346 (0.262) |
3 |
30% EtOH |
473 |
512 |
0.35 |
0.098 (0.067) |
|
30% EtOH (H+)b |
518 |
543 |
0.10 |
0.202 (0.141) |
|
PMAA (H+)c |
449 |
491 |
0.58 |
0.387 (0.297) |
a
[dye] = 5.0 mMb
30 % (v/v) EtOH in H2O with 1.7 M trifluoroacetic acid (TFA)c
PMAA in H2O, pH 3.0; R/D 1000.d
Fluorescence polarization (anisotropy)