Imaging Science and Photochemistry ›› 2016, Vol. 34 ›› Issue (4): 312-318.DOI: 10.7517/j.issn.1674-0475.2016.04.312

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Indigo-F- as a Spectrophotometric Ensemble Probe for Trace Water in Aprotic Organic Solvents

WANG Shuxian1, YU Fang2, SUN Huanhe2, DONG Zhenming2   

  1. 1. China Institute for Radiation Protection, Taiyuan 030006,Shanxi,P.R.China;
    2. School of Chemisty and Chemical Engineering, Shanxi University, Taiyuan 030006, Shanxi,P.R.China
  • Received:2016-01-29 Revised:2016-04-07 Online:2016-07-15 Published:2016-07-15

Abstract:

A simple spectrophotometric method for detecting trace water in aprotic organic solvents using Indigo-F- ensemble has been developed. In the presence of excess F- ions, the color of Indigo solution changes from blue to yellow-green. The resulting yellow-green solution changed to blue upon subsequent addition of trace water, which makes naked eye detection possible. Therefore, the system could be used as a chromogenic probe for detecting water in common aprotic organic solvents. Detection limits were of 0.022%, 0.043%, 0.016%, 0.34% and 0.015% for DMSO, THF, DMF, 1, 4-dioxane and acetonitrile, respectively. The sensing process was studied by 1HNMR titration experiments. The developed method is simple and easy to operate, and the cost of analysis is low.

Key words: spectrophotometric, aprotic organic solvents, trace water, probe, Indigo