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Table 1 Absorption maxima of the hydrazone tautomer (B) of arylazo pyridone dyes (1–12) in protic 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)
Methanol Ethanol Propan-1-ol Propan-2-ol Butan-1-ol 2-Methylpropan-2-ol
1 433 434 434 433 433 431
2 460 470 476 472 470 474
3 460 458 458 455 448 454
4 445 446 447 445 446 445
5 437 435 438 439 439 439
6 437 438 438 438 442 440
7 440 442 443 442 442 442
8 433 436 436 434 436 436
9 424 426 425 425 425 424
10 432 432 433 433 433 433
11 437 436 436 435 435 435
12 429 428 429 428 428 427