Solvent effects on the UV-visible absorption spectra of some new (4-arylazothiophen-2-yl) (5-bromothiophen-2-yl) ketone dyes | ||
| Mansoura Journal of Chemistry | ||
| Volume 46, Issue 4, December 2019, Pages 12-15 PDF (646.74 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/mjcc.2019.413045 | ||
| Abstract | ||
| A facile synthesis of various (4-arylazothiophen-2-yl) (5-bromothiophen-2-yl) ketone dyes 4a-e was described through heterocyclization of the precursor 2-arylazo-2-acetyl-thioacetanilides 3 with 5-bromo-2-(bromoacetyl)-thiophene. The effect of solvent polarity on absorption spectra was investigated, as was the relationship between dye structures and absorption in the UV–visible region. The absorption maxima of the tested arylazo-thiophene dyes ranged from 464 to 490 nm in ethanol, from 484 to 492 nm in DMF and from 494 to 496 nm in acetone. | ||
| Keywords | ||
| 2-Acetyl-2-arylazothioacetanilides; 5-Bromo-2-(bromoacetyl)-thiophene; dithiophen-2-yl ketones; UV-visible absorption; Solvent effect | ||
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