Table 2 Absorption maxima of hydrazone tautomer (B) of arylazo pyridone dyes (1–12) in aprotic solvents
Dye No. | λmax(nm) | ||||||
|---|---|---|---|---|---|---|---|
Tetrahydrofuran | Dioxane | Methyl acetate | Ethyl acetate | Dimethylformamide | Dimethylacetamide | Dimethyl sulfoxide | |
1 | 431 | 430 | 430 | 429 | 415 | 428 | 437 |
2 | 466 | 461 | 460 | 460 | 470 | 470 | 473 |
3 | 455 | 455 | 454 | 454 | 449 | 456 | 459 |
4 | 442 | 442 | 441 | 440 | 423 | 441 | 449 |
5 | 434 | 437 | 434 | 433 | 417 | 427 | 440 |
6 | 436 | 437 | 434 | 433 | 421 | 425 | 441 |
7 | 439 | 441 | 437 | 437 | 425 | 432 | 447 |
8 | 432 | 432 | 431 | 429 | 410 | 422 | 437 |
9 | 426 | 426 | 423 | 423 | 433 | 434 | 430 |
10 | 431 | 432 | 429 | 429 | 431 | 433 | 437 |
11 | 434 | 436 | 433 | 432 | 436 | 439 | 442 |
12 | 429 | 430 | 427 | 427 | 451 | 452 | 437 |