2009年2月
Stability of Superoxide Ion in Imidazolium Cation-Based Room-Temperature Ionic Liquids
JOURNAL OF PHYSICAL CHEMISTRY A
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- 巻
- 113
- 号
- 5
- 開始ページ
- 912
- 終了ページ
- 916
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1021/jp807541z
- 出版者・発行元
- AMER CHEMICAL SOC
The stability of superoxide ion (O(2)(center dot-)) generated chemically by dissolving KO(2) in dried dimethyl sulfoxide solutions containing imidazolium cation [e.g., 1-ethyl-3-methylimidazolium (EMI(+)) and 1-n-butyl-2,3-dimethylimidazolium (BMMI(+))] based ionic liquids (ILs) was investigated with UV-visible spectroscopic. NMR, and voltammetric techniques and an ab initio molecular orbital calculation. UV-visible spectroscopic and cyclic voltammetric measurements reveal that the O(2)(center dot-) species reacts with BMMI+ and EMI(+) cations of ILs to form hydrogen peroxide. The pseudo first order rate constant for the reaction of BMMI(+) and O(2)(center dot-) species was found to be about 2.5 x 10(-3) s(-1). With a molecular orbital calculation, the O(2)(center dot-) species is understood to attack the 2-position (C-2) of the imidazolium ring (i.e., BMMI(+)) to form an ion pair complex in which one oxygen atom is bounded to C-2 and the other to the hydrogen atom of -CH(3) group attached to C-2. Eventually, the ion pair complex of BMMI(+) cation and O(2)(center dot-) species undergoes a ring opening reaction as evidenced with (1)H NMR measurement.
- リンク情報
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- DOI
- https://doi.org/10.1021/jp807541z
- CiNii Articles
- http://ci.nii.ac.jp/naid/80020102359
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/19133769
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000262902500018&DestApp=WOS_CPL
- ID情報
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- DOI : 10.1021/jp807541z
- ISSN : 1089-5639
- CiNii Articles ID : 80020102359
- PubMed ID : 19133769
- Web of Science ID : WOS:000262902500018