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

以苯胺和邻硝基苯胺为原料，分别与2-萘酚发生重氮偶氮反应制得两个偶氮化合物(1：1-苯基偶氮-2-萘酚和2：1-(2-硝基苯基偶氮)-2-萘酚)，用红外光谱表征其结构，并通过紫外光谱对化合物的光谱性质进行了研究。实验结果表明两个化合物均具有较大的摩尔吸光系数(1：ε_478nm = 1.49 × 10⁴ L/mol·cm；2：ε_329nm = 1.32 × 10⁴ L/mol·cm)，在溶液pH小于10时紫外光谱基本不变，在强碱性范围内紫外谱图有变化，表现出一定的酸碱变色性。

Synthesis and Spectroscopic Study of 1-Phenylazo-2-Naphthol and 1 - (2-Nitrophenylazo) - 2-Naphthol

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：ε_478nm = 1.49 × 10⁴ L/mol·cm；2：ε_329nm = 1.32 × 10⁴ L/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.