Solvent effects on the UV-visible absorption spectra of some new (4-arylazothiophen-2-yl) (5-bromothiophen-2-yl) ketone dyes
El-Shafeai, H., . Ismail, M., Abdel-Latif, E. (2019). Solvent effects on the UV-visible absorption spectra of some new (4-arylazothiophen-2-yl) (5-bromothiophen-2-yl) ketone dyes. EKB Journal Management System, 46(4), 12-15. doi: 10.21608/mjcc.2019.413045
Heba M. El-Shafeai; Mohamed A . Ismail; Ehab Abdel-Latif. "Solvent effects on the UV-visible absorption spectra of some new (4-arylazothiophen-2-yl) (5-bromothiophen-2-yl) ketone dyes". EKB Journal Management System, 46, 4, 2019, 12-15. doi: 10.21608/mjcc.2019.413045
El-Shafeai, H., . Ismail, M., Abdel-Latif, E. (2019). 'Solvent effects on the UV-visible absorption spectra of some new (4-arylazothiophen-2-yl) (5-bromothiophen-2-yl) ketone dyes', EKB Journal Management System, 46(4), pp. 12-15. doi: 10.21608/mjcc.2019.413045
El-Shafeai, H., . Ismail, M., Abdel-Latif, E. Solvent effects on the UV-visible absorption spectra of some new (4-arylazothiophen-2-yl) (5-bromothiophen-2-yl) ketone dyes. EKB Journal Management System, 2019; 46(4): 12-15. doi: 10.21608/mjcc.2019.413045

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
Authors
Heba M. El-Shafeai* 1; Mohamed A . Ismail1; Ehab Abdel-Latif2
1Chemistry Department, Faculty of Science, Mansoura University, 35516 Mansoura, Egypt
2Chemistry Department, Faculty of Science, Mansoura University
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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