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Kinetics of superoxide ion in dimethyl sulfoxide containing ionic liquids

Authors
  • Hayyan, Maan1, 2
  • Hashim, Mohd Ali2, 3
  • AlNashef, Inas M.4
  • 1 University of Malaya, Department of Civil Engineering, Kuala Lumpur, 50603, Malaysia , Kuala Lumpur (Malaysia)
  • 2 University of Malaya, University of Malaya Centre for Ionic Liquids (UMCiL), Kuala Lumpur, 50603, Malaysia , Kuala Lumpur (Malaysia)
  • 3 University of Malaya, Department of Chemical Engineering, Kuala Lumpur, 50603, Malaysia , Kuala Lumpur (Malaysia)
  • 4 King Saud University, Chemical Engineering Department, Riyadh, 11421, Saudi Arabia , Riyadh (Saudi Arabia)
Type
Published Article
Journal
Ionics
Publisher
Springer Berlin Heidelberg
Publication Date
Aug 13, 2014
Volume
21
Issue
3
Pages
719–728
Identifiers
DOI: 10.1007/s11581-014-1224-y
Source
Springer Nature
Keywords
License
Yellow

Abstract

The chemical generation of superoxide ion (O2•−) by dissolving potassium superoxide was investigated. The chemically generated O2•− was then used to study the long-term stability of O2•− in dimethyl sulfoxide (DMSO) containing ionic liquids (ILs) and determine the rate constants based on pseudo 1st- and 2nd-order reactions between the IL and O2•− generated in DMSO. O2•− was unstable in DMSO containing [S222][TFSI], [DMIm][MS], [BDMIm][TfO], [EMIm][TFSI], [EMIm][MS], [P14,666][TPTP], [P14,666][TFSI], and all pyridinium-based ILs. In contrast, O2•− was very stable in DMSO containing [MOPMPip][TFSI], [BMPyrr][DCA], [BMPyrr][TFSI], [BMPyrr][TfO], [HMPyrr][TFSI], [MOEMPip][TPTP], [BMPyrr][TFA], [N112,1O2][TFSI], and [MOEMMor][TFSI]. This shows that these ILs can be used for different applications involving O2•−. The reaction rate constant, total consumption, and consumption rate of O2•− were determined. The rate constants of O2•− in some ILs were found to follow pseudo 1st-order reaction, while in others, pseudo 2nd-order reaction kinetics were observed.

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