TY - JOUR
T1 - Kinetics of superoxide ion in dimethyl sulfoxide containing ionic liquids
AU - Hayyan, Maan
AU - Hashim, Mohd Ali
AU - AlNashef, Inas M.
N1 - Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.
PY - 2015/3
Y1 - 2015/3
N2 - 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.
AB - 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.
KW - Aprotic solvents
KW - Ionic liquids
KW - Oxygen reduction
KW - Potassium superoxide
KW - Reaction engineering
KW - Superoxide ion
UR - http://www.scopus.com/inward/record.url?scp=84923307900&partnerID=8YFLogxK
U2 - 10.1007/s11581-014-1224-y
DO - 10.1007/s11581-014-1224-y
M3 - Article
AN - SCOPUS:84923307900
SN - 0947-7047
VL - 21
SP - 719
EP - 728
JO - Ionics
JF - Ionics
IS - 3
ER -