Research Article
Hetarylazopyrazolone Dyes Based on Benzothiazole and Benzimidazole Ring Systems: Synthesis, Spectroscopic Investigation, and Computational Study
Table 3
Influence of solvent on
(nm) of dyes 3a–3f.
| | Dye number | | Chloroform | Acetic acid | Methanol | Acetonitrile | DMF () | DMSO | |
| | 3a | Exp. | 419 | 408 | 457 | 411 | 467 (4.443) | 469 | 50 | | 433 (0.9087) | 432 (0.8890) | 434 (0.8672) | 432 (0.8779) | 434 (0.9028) | 433 (0.8990) |
| | 3b | Exp. | 421 | 409 | 459 | 412 | 469 (4.460) | 469 | 48 | | Calc. | 439 (0.9685) | 438 (0.9548) | 438 (0.9502) | 437 (0.9543) | 439 (0.9742) | 439 (0.9715) |
| | 3c | Exp. | 450 | 434 | 467 | 469 | 469 (4.569) | 469 | 19 | | Calc. | 488 (0.8218) | 487 (0.8212) | 486 (0.8268) | 488 (0.8240) | 490 (0.8392) | 490 (0.8372) |
| | 3d | Exp. | 450 | 425 | 465 | 462 | 469 (4.774) | 473 | 23 | | Calc. | 462 (0.8391) | 461 (0.8168) | 462 (0.7946) | 462 (0.7981) | 464 (0.8060) | 463 (0.8026) |
| | 3e | Exp. | 452 | , 449 | , 442 | , 449 | 453 (4.576) | 461 | 9 | | Calc. | 447 (0.9126) | 449 (0.9206) | 446 (0.9126) | 447 (0.9158) | 449 (0.9307) | 449 (0.9286) |
| | 3f | Exp. | 464 | 461 | 460 | 462 | 459 (4.649) | 469 | 5 | | Calc. | 480 (0.8510) | 482 (0.8528) | 480 (0.8510) | 481 (0.8544) | 483 (0.8710) | 483 (0.8688) |
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; strengths are given in the parentheses; .
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