Document Detail


Water as an in situ NMR indicator for impurity acids in ionic liquids.
MedLine Citation:
PMID:  19117465     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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-methylimidazolium methanesulfonate from acetone. It was demonstrated that impurity acids can be almost perfectly removed by single or double recrystallization.
Authors:
Yoshiro Yasaka; Chihiro Wakai; Nobuyuki Matubayasi; Masaru Nakahara
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Analytical chemistry     Volume:  81     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-01-01     Completed Date:  2009-02-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  400-7     Citation Subset:  -    
Affiliation:
Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Japan.
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