TABLE 1. Spectroscopic Data in Ethanol and Chloroforma.
| Compd. | λmax (abs)
(nm) |
ε
(M−1 cm−1) |
λem (nm) |
|---|---|---|---|
| 1 | 499 | 110,000 | 508 |
| 2 | 569
(578) |
80,000
(89,000) |
583
(591) |
| 3 | 500
(502) |
72,000
(85,000) |
508
(512) |
| 8 | 562 | 118,000 | 572 |
| 9 | 568
(577) |
104,000
(117,000) |
579
(585) |
| 11 | 567
(572) |
114,000
(119,000) |
574
(580) |
| 15 | 568 | 76,000 | 577 |
| 21 | 495
(502) |
75,000
(85,000) |
500
(515) |
a
The parentheses indicate the data obtained with compounds dissolved in chloroform. The absorption spectra were recorded at 6.25 × 10−6 M at 25 °C. The emission spectra were recorded at 1.0 × 10−7 M.