Studies of Electron Transfer Reactions at the Interface Between Room-temperature Ionic Liquid+1,2-Dichloroethane Solutions  and Water by  Scanning Electrochemical Microscopy

Chem. J. Chinese Universities

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Studies of Electron Transfer Reactions at the Interface Between Room-
temperature Ionic Liquid+1,2-Dichloroethane Solutions and Water by Scanning Electrochemical Microscopy

ZHANG Mei-Qin; LIU Hui; HU Hu; XIE ShuBao; JING Ping; KOU Yuan; SHAO Yuan-Hua

College of Chemistry and Molecular Engineering, Peking University,
Beijing 100871, China

Received:2006-02-15 Revised:1900-01-01 Online:2006-07-10 Published:2006-07-10
Contact: SHAO Yuan-Hua

Abstract

Abstract: The kinetic behavior of electron transfer(ET) reactions at the interface between room-temperature ionic liquid(RTIL, Omim·Tf₂N) + 1,2-dichloroethane(DCE) solutions and water was studied by scanning electrochemical microscopy(SECM). The tip was positioned in the top RTIL+DCE solutions containing ferrocene(Fc), and potassium ferrocyanide[K₄Fe(CN)₆] was employed as the mediator in water(bottom phase). The effects of RTIL with different volume fractions(x_RTIL) in the mixtures on the apparent heterogeneous ET rate constants(k) were investigated at the same concentration ratio of the common ion(Tf₂N^-) by fitting the experimental approach curves to the theoretical values. The results showed that with x_RTILdecreasing from 1 to 0.1, the diffusion coefficient of Fc(D_Fc) in the mixtures increased from 2.730×10^-7 to 9.131×10^-6 cm²·s^-1 monotonously, but k decreased firstly(from 8.0 to 0.32 mol^-1·cm·s-¹), and then increased a little(from 0.32 to 0.48 mol^-1·cm·s^-1). The possible reasons for observation of these behavior were discussed in details.

Key words: Scanning electrochemical microscopy, Liquid/liquid interface, Room-temperature ionic liquids, Electron transfer

CLC Number:

O646

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ZHANG Mei-Qin; LIU Hui; HU Hu; XIE ShuBao; JING Ping; KOU Yuan; SHAO Yuan-Hua. Studies of Electron Transfer Reactions at the Interface Between Room-
temperature Ionic Liquid+1,2-Dichloroethane Solutions and Water by Scanning Electrochemical Microscopy[J]. Chem. J. Chinese Universities, doi: .

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Studies of Electron Transfer Reactions at the Interface Between Room-
temperature Ionic Liquid+1,2-Dichloroethane Solutions and Water by Scanning Electrochemical Microscopy

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