2009年1月
Water as an in Situ NMR Indicator for Impurity Acids in Ionic Liquids
ANALYTICAL CHEMISTRY
- ,
- ,
- ,
- 巻
- 81
- 号
- 1
- 開始ページ
- 400
- 終了ページ
- 407
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/ac801767u
- 出版者・発行元
- AMER CHEMICAL SOC
A sensitive in situ NMR spectroscopic method for detecting acids contaminating ionic liquids (ILs) has been developed. The chemical shift and the spectral width of water added to ILs were used as indicators to measure the impurity acid level. Owing to the high resolution power of NMR, the detection limit is below the level of 10(-3) mol kg(-1). A new method is applicable to a number of commonly used ILs such as the imidazolium- and ammonium-based ILs except for those composed of acidic cations or anions. The method was utilized to monitor the purification efficiency in the recrystallization of a typical hydrophilic IL, 1-butyl-3-methylimidazohum methanesuffonate from acetone. It was demonstrated that impurity acids can be almost perfectly removed by single or double recrystallization.
- リンク情報
- ID情報
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- DOI : 10.1021/ac801767u
- ISSN : 0003-2700
- PubMed ID : 19117465
- Web of Science ID : WOS:000262113400056