| Solvent | λmax, nm (E)-1,3,3- triphenyltriazene | λmax, nm (E)-3,3-diisopropyl-1 -phenyltriazene | λmax, nm (E)-(4-chlorophenyl)-3- cyclopentyltriazene |
| MeOH | 357 | 315 | 352 |
| MeCN | 355 | 313 | 350 |
| DMF | 359 | 317 | 357 |
| DMSO | 360 | 316 | 355 |