Table 1.
Coumarin derivatives used in this study
| chemical name | abbreviation | MW | Ex | Em | FI |
|---|---|---|---|---|---|
| 3-(2-Benzothiazolyl-7-(diethylamino)-coumarin | BTDEC | 350 | 474 | 511 | 34 |
| 3-(2-Benzimidazolyl)-7-(diethylamino)-coumarin | BIDEC | 333 | 457 | 497 | 28 |
| 3-(2-Benzimidazolyl)-7-coumarin | BIC | 262 | 456 | 497 | 24 |
| 3-(2-Benzimidazolyl)-7-(dipropylamino)-coumarin | BIDPC | 361 | 456 | 497 | 24 |
| 3-(2-Benzoxazolyl)-7-(diethylamino)-coumarin | BODEC | 369 | 460 | 502 | 24 |
| 3-(6-methyl-2-benzoxazolyl)-7-(diethylamino)-coumarin | MBODEC | 348 | 458 | 501 | 10 |
| 3-(Diethylamino)-7-imino-7H-(1)benzopyrano(3',2':3,4) pyrido(1,2-a)benzimidazole-6-carbonitrile |
DIBPBC | 381 | 554 | 580 | 32 |
| 3-(Diethylamino)-7-oxo-7H-(1)benzopyrano(3',2':3,4) pyrido(1,2-a)benzimidazole-6-carbonitrile |
DOBPBC | 382 | 559 | 584 | 36 |
The fluorescence properties of coumarin derivatives were measured in DMSO. MW: molecular weight; Ex: fluorescence excitation; Em: fluorescence emission; FI: fluorescence intensity.