Effect of Solvent Polarity on the Electronic Absorption Spectra of Some Phenylazo Moieties of 2-Naphthol, Resorcinol and 1,2-Dihydroxyanthraquinone.Ask ChatGPT
Abstract
This paper reports the synthesis of azo compounds by linking diazonium salts, obtained from aromatic amines—aniline, 2-aminophenol, 4-aminobenzoic acid, and 3-nitroaniline—to coupling components such as resorcinol, 2-naphthol, and 1,2-dihydroxyanthraquinone through well-known diazo-coupling reactions. The percentage yields of the recrystallized azo dyes ranged from 65% to 97%, and their melting points ranged between 120°C and 230°C.
The effect of solvent polarity on the UV-Vis spectral properties of these azo dyes was also investigated. Electronic spectral data for the nine azo compounds revealed bathochromic red shifts (positive solvatochromism) in highly polar protic solvents (ethanol) and polar aprotic solvents (acetonitrile), compared to less polar aprotic solvents like acetone.
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