关键词:

硝基苯, 离子液体, 紫外光谱, 电还原, 扩散系数

Abstract:

The effect of interaction in ionic liquids on diffusion coefficient of nitrobenzene was investigated with ultraviolet spectroscopy and cyclic voltammetry.The results showed that compared with the ultraviolet spectrum in cyclohexane and water, red shift effect of absorption peak of nitro group was observed in EMimBF₄(1-ethyl-3-methylimidazolium tetrafluoroborate), and no end absorption was found when the wavelength was smaller than 210 nm, while the absorption of benzene ring had little change.These phenomena could be ascribed to the strong interaction between EMimBF₄ and nitro group.The interaction between EMimBF₄ and nitrobenzene as well as between EMimBF₄and water had a complicated effect on diffusion coefficient of nitrobenzene electrochemically reduced in EMimBF_4With increasing concentration of nitrobenzene, diffusion coefficient of nitrobenzene decreased.Increasing the carbon number of imidazolium side chain had a similar effect, but the trend of decrease was slower.At the same nitrobenzene concentration, with increasing water concentration, the value of diffusion coefficient of nitrobenzene increased in the same ILs.In different ILs, at a larger carbon number of imidazolium side chain, increasing water concentration caused a faster trend of increase of diffusion coefficient.

Key words:

硝基苯, 离子液体, 紫外光谱, 电还原, 扩散系数