Table 1.
The photophysical properties of compounds.
|
|
Solvent[a] |
λ abs [b] (ϵ [c]) |
λ F [d] |
τ F [e] |
ΦF [f] |
ΦΔ [g] |
τ T [h] |
ΦT [i] |
|---|---|---|---|---|---|---|---|---|
|
BDP‐1 |
HEX |
620 (1.40) |
629 |
5.4 |
0.732 |
–[l] |
–[l] |
–[l] |
|
TOL |
630 (1.33) |
641 |
4.9 |
0.393 |
0.23 |
333.2[k] |
0.25 |
|
|
ACN |
619 (1.23) |
631 |
2.9 |
0.002 |
–[l] |
–[l] |
–[l] |
|
|
BDP‐2 |
HEX |
629 (0.57) |
640 |
4.3 |
0.354 |
0.05 |
–[l] |
–[l] |
|
TOL |
639 (0.54) |
651/768[j] |
2.6/2.3[j] |
0.005/0.018[j] |
0.18 |
382.2[k] |
0.22 |
|
|
ACN |
628 (0.53) |
625 |
1.5 |
0.003 |
–[l] |
–[l] |
–[l] |
|
|
BDP‐3 |
HEX |
597 (0.67) |
633 |
3.0 |
0.484 |
0.04 |
394.4[k] |
0.04 |
|
TOL |
600 (0.60) |
647 |
2.4 |
0.299 |
0.12 |
392.7[k] |
0.13 |
|
|
ACN |
590 (0.60) |
629 |
1.4 |
0.003 |
–[l] |
–[l] |
–[l] |
|
|
BDP‐4 |
HEX |
596 (0.66) |
630 |
2.9 |
0.462 |
0.03 |
278.8[k] |
0.05 |
|
TOL |
597 (0.57) |
641 |
1.9 |
0.360 |
0.04 |
244.0 |
0.04 |
|
|
ACN |
587 (0.60) |
631 |
0.07 |
0.022 |
–[l] |
–[l] |
–[l] |
|
|
Styryl‐BDP |
HEX |
619 (1.15) |
630 |
5.2 |
0.768 |
–[l] |
–[l] |
–[l] |
|
TOL |
628 (1.06) |
641 |
4,7 |
0.768 |
–[l] |
–[l] |
–[l] |
|
|
ACN |
617 (1.04) |
631 |
5.2 |
0.763 |
–[l] |
–[l] |
–[l] |
|
|
Styryl‐BDP‐CN |
HEX |
627 (0.78) |
–[l] |
–[l] |
–[l] |
–[l] |
–[l] |
–[l] |
|
TOL |
636 (0.97) |
649 |
4.2 |
0.652 |
–[l] |
–[l] |
–[l] |
|
|
ACN |
627 (0.96) |
639 |
4.4 |
0.612 |
–[l] |
–[l] |
–[l] |
[a] E T(30) values are HEX (31.0), TOL (33.9) and ACN (45.6), in kcal mol−1. [b] c=1.0×10−5 M, in nm. [c] Molar absorption coefficient. ϵ=105 M−1 cm−1. [d] Fluorescence wavelength, in nm. [e] Fluorescence lifetime, λ ex=635 nm, in ns, c=1.0×10−5 M. [f] Absolute fluorescence quantum yield. [g] Singlet oxygen quantum yield, methylene blue (MB) as standard (ΦΔ=0.57 in DCM). [h]Triplet state lifetime, in μs. [i] Triplet quantum yield, methylene blue (MB) as standard (ΦT=0.50 in methanol). [j] The transition of 1CT→S0. [k] Intrinsic triplet state lifetimes. Obtained by fitting of the experimental curves based on the kinetic model with triplet‐triplet‐annihilation self‐quenching effect considered.22 [l] Not observed.