| Compound | solvent | λmax/nm (ε/M−1∙cm−1) | |||
| 1 | cyclohexane | 475 | 326 | 233 | 207 |
|
|
| (2200) | (25,000) | (36,000) | (57,000) |
|
| CH2Cl2 | 488 | 328 | 243 | 234 |
|
|
| (2700) | (29,000) | (40,000) | (43,000) |
|
| DMF | 502 | 326 |
|
|
| A | heptane | 462 | 406 | 320 |
|
| A | DMF | 492 | 340 |
|
|