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- Title
Solvatochromic responses and pH effects on the electronic spectra of some azo derivatives of 1-amino-2-hydroxy-4-naphthalenesulfonic acid.
- Authors
Masoud, Mamdouh; Ramadan, Ahmed; Soayed, Amina; Ammar, Sherif
- Abstract
Synthesis and characterization of five arylazo derivatives of 1-amino-2-hydroxy-4-naphthalenesulfonic acid (HL) are reported. The UV/Vis absorption spectra of the parent compound (HL) and its arylazo derivatives (HL-HL) have been measured at room temperature in seven solvents of different polarities and with variable parameters. The electronic transitions were analyzed using SPSS program, linear regression technique and Kamlet-Taft's equation to permit a good understanding of solvent-induced spectral shifts. The electronic absorption spectra of the prepared compounds containing different substituents were studied in aqueous solutions at different pH values. The p K values of the investigated compounds were evaluated spectrophotometrically. The prevailing acid species present at any pH range are judged from the constructed distribution diagrams.
- Subjects
SOLVATOCHROMISM; PH effect; ELECTRONIC spectra; AZO compound synthesis; NAPHTHALENESULFONIC acids; CHEMICAL derivatives; DIAZOTIZATION
- Publication
Journal of the Iranian Chemical Society, 2016, Vol 13, Issue 5, p931
- ISSN
1735-207X
- Publication type
Article
- DOI
10.1007/s13738-016-0809-y