Table 1. Spectroscopic properties for the coumarin dyes in different mediaa

 

 Dye

medium

la (nm)

lf (nm)

Ff

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 mM

b30 % (v/v) EtOH in H2O with 1.7 M trifluoroacetic acid (TFA)

cPMAA in H2O, pH 3.0; R/D 1000.

dFluorescence polarization (anisotropy)