咪唑型离子液体对4–甲氧基甲苯的电氧化性能研究

通过紫外光谱研究了EMIMBF₄、BMIMBF₄、BMIMHSO₄和BMIMAc四种咪唑型离子液体(ILs)与4–甲氧基甲苯（p-MT）之间的相互作用，采用循环伏安法（CV）和计时电流法（CP）研究了p-MT在四种离子液体中的电化学氧化行为，探讨了咪唑型离子液体对反应的影响. 实验结果表明，在离子液体水溶液中p-MT的紫外光谱出现明显的红移，其溶剂分子和反应底物p-MT之间相互作用，这有利于p-MT产生相对稳定的激发态. p-MT在离子液体水溶液中的电氧化受扩散控制，且p-MT在EMIMBF₄水溶液中的扩散系数和电解产物的产率和选择性最佳.

Effect of Imidazole Ionic Liquids on the Electro-Oxidation of p-Methoxy Toluene

The interactions between four Imidazole ionic liquids (EMIMBF₄, BMIMBF₄, BMIMHSO₄, BMIMAc) and p-methoxy toluene were investigated by ultraviolet spectroscopy. The red shifts of absorption peak were obviously observed, and the fine structures of the spectroscopy were disappeared on the long wave district. p-MT producing stable excited state was benefit from the interaction with solvent molecules. The electro-oxidation behavious of p-MT were studied in the four ILs on platinum electrode by cyclic voltammetry (CV) and chronoamperometry (CP), and the diffusion coefficients (D) and activation energies (ED) were calculated. The results indicated that the electro-oxidation process of p-MT was irreversible and controlled by diffusion. The diffusion coefficient of p-MT and the selectivity of electrolytic product were maximum in EMIMBF4 compared to other ionic liquids.