| Solvent | 5b | 6e | ||
| λmax | εmax | λmax | εmax | |
| C6H6 | 470 | 984.7 | 462 | 642.03 |
| Water | 474 | 669.9 | 469 | 534.2 |
| CCl4 | 449 | 647.9 | 465 | 220 |
| DMF | 501 | 869.49 | 500 | 568 |
| EtOH | 498 | 918.86 | 478 | 925.5 |
| CHCl3 | 470 | 977.42 | 472 | 947 |
| Acetone | 492 | 771.46 | 478 | 802 |