Two azo compounds (1: 1-phenylazo-2-naphthol and 2: 1-(2-nitrophenylazo)-2-naphthol) were synthesized by diazo coupling reaction of aniline and o-nitroaniline with 2-naphthol, respectively. Their structures were characterized by IR, and the spectral properties of the compounds were studied by UV spectra. The results showed that the two compounds have big molar absorptivity (1：ε478nm= 1.49 × 104L/mol·cm；2：ε329nm= 1.32 × 104L/mol·cm). When the pH of the solution is less than 10, the UV spectrum is basically unchanged. In the strong alkaline range, the UV spectrum changes, showing a certain acid-base discoloration.
吴平, 唐晓东, 任红, 芦菲, 孟凡飞. 1-苯基偶氮-2-萘酚和1-(2-硝基苯基偶氮)-2-萘酚的合成及光谱研究 [J]. 兴发pt登录学报, 2020, 37(11): 1-3. WU Ping, TANG Xiaodong, REN Hong, LU Fei, MENG Fanfei. Synthesis and Spectroscopic Study of 1-Phenylazo-2-Naphthol and 1 - (2-Nitrophenylazo) - 2-Naphthol . Journal of Jilin Institute of Chemical Technology, 2020, 37(11): 1-3.