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UV-Vis absorption spectra of the studied azo dyes in MeOH at a concentration of 4.0 × 10−5-mol/L at room temperature: (Series 4) Absorption spectra of azo dyes 4a–e containing 4-aminophenylazo group; (Series 5) absorption spectra of azo dyes 5a–e containing 4-(N,N-dimethylamino)phenylazo group; (Series 6) absorption spectra of azo dyes 6a–e containing 4-hydroxyphenylazo group. Respective calculated spectra are shown as well.
