Evidence for formation of ion pair stabilized diiodomethane radical anion in 1-butyl-3-methylimidazolium tetrafluoroborate room temperature ionic liquid

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• 作者：Mohsin Ahmad Bhat ; ^{mohsinch@kashmiruniversity.ac.in} ; ^{mohsin_skb@yahoo.co.in} ; Pravin P. Ingole¹
• 关键词：1-Butyl-3-methylimidazolium tetrafluoroborate ; Diiodomethane ; Marcus&ndash ; Hush quadratic activation ; Dissociative electron transfer ; Room temperature ionic liquid ; Cyclic voltammetry
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：30 June, 2012
• 卷：72
• 期：Complete
• 页码：18-22
• 文件大小：469 K

摘要

Voltammetric investigations on diiodomethane (CH₂I₂) in 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF₄]) are reported. Presented investigations show that, electroreduction of CH₂I₂ follows a typical irreversible redox behavior, where in initial electron transfer is the rate determining step. Electroreductive cleavage of carboniodine (CI) bond in CH₂I₂ is discussed in light of Marcus-Hush quadratic activation-driving force theory. The experimental findings establish that the dissociative electron transfer of CI bond in [BMIM][BF₄] follows a stepwise pathway, which is a direct experimental evidence for formation of ion pair stabilized radical anion in RTIL. The reported results establish the role of RTILs in stabilization of electrogenerated intermediate and their subsequent chemistry in an electro-synthetic pathway.