专业从事离子液体的合成、应用及其相关技术的研究工作----Lanzhou Greenchem ILs/青岛奥立科

题名

[Wiley数据库][2013] Quantification of ionic liquids Concentration in Water and Qualification of Conjugated and Inductive Effects of ionic liquids by UV Spectroscopy

参考引用方式

Yuanyuan Cao, Yu Chen, Xiaofu Sun, Tiancheng Mu. Clean – Soil, Air, Water 2013, 41 (9999), 1–8

研究机构

中国人民大学

所涉及离子液体

1-乙基-3-甲基咪唑四氟硼酸盐等              143314-16-3

研究领域

共轭效应和诱导效应；离子液体浓度检测；紫外光谱法

论文摘要

The determination of the concentrations of ionic liquids (ILs) in water by UV spectroscopy was proposed. The effects of alkyl chain length, anion, cation, and C2 methylation of ILs were systematically investigated. The concentration detection limit ranges from 0.625 to 80 mg/L, and can be extended by changing the path length of the UV cuvette. In addition, the conjugated and inductive effects of ILs were analyzed by the maximum absorption wavelength λ_max. Cations without conjugated effect (e.g., pyrrolidium, tetraammonium, and tetraphosphonium) show no UV spectra peak, while cations with conjugated effects (e.g., imidazolium, and pyridinium) present UV spectra peaks. Electron-donating substitute groups (e.g., alkyl, C2 methylation) induce a larger value of maximum absorption wavelength λ_max than the electron-withdrawing substitute groups (e.g., amine, non-C2 methylation). These findings are helpful to detect and quantify the concentration of ILs in water.

关键词

Conjugated effect; Inductive effect; Ionic liquids; UV–visible spectroscopy; Water