Skip to main content

Table 2 Absorption maxima of hydrazone tautomer (B) of arylazo pyridone dyes (1–12) in aprotic solvents

From: Synthesis, structure and solvatochromic properties of some novel 5-arylazo-6-hydroxy-4-phenyl-3-cyano-2-pyridone dyes

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