Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (10): 2005-2010.doi: 10.3866/PKU.WHXB20091007

• ARTICLE • Previous Articles     Next Articles

Effect of the Interaction between Nitrobenzene and Ionic Liquids on the Transfer Coefficient of the Nitrobenzene Electrochemical Reduction

CHEN Song, MA Chun-An, CHU You-Qun, MAO Xin-Biao, BAI Yun-Shan, CHEN Liang   

  1. State Key Laboratory of Green Chemistry Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China|Institute of Applied Chemistry, Yancheng Institute of Technology, Yancheng 224002, Jiangsu Province, P. R. China
  • Received:2009-03-30 Revised:2009-06-22 Published:2009-09-29
  • Contact: MA Chun-An E-mail:science@zjut.cn

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Abstract:

The interaction between ionic liquids (ILs) and nitrobenzene was investigated using ultraviolet spectroscopy. Compared to the ultraviolet spectrum in cyclohexane and water, a red shift of the absorption peak of the nitro group was observed in ionic liquids and no end absorption was found when the wavelength was less than 210 nm. These phenomena may be attributed to the strong interaction between ILs and nitrobenzene. The transfer coefficient (α) of the electrochemical reduction of nitrobenzene for transferring the second electron in RMimBF4 (1-alkyl-3-methylimidazolium tetrafluoroborate) was investigated by cyclic voltammetry. The effect of the dielectric nature of nitrobenzene and water on the dielectric constants of the solution and on the capacitance of the electric double layer as well as the interaction between EMimBF4 (1-ethyl-3-methylimidazolium tetrafluoroborate) and nitrobenzene and water was found to have a complicated effect on α. Increasing the concentration of nitrobenzene during the electrochemical reduction in RMimBF4, α decreased. Increasing the temperature the value of α increased while increasing the length of the imidazolium side chain had an opposite effect. At the same nitrobenzene concentration, with an increase in the water concentration α was reduced in EMimBF4-H2O system at lower water concentration and had reverse effect at higher water concentration.

Key words: Ultraviolet spectroscopy, Nitrobenzene, RMimBF4, Electrochemical reduction, Transfer coefficent