高等学校化学学报

高等学校化学学报

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香豆素在离子液体(BMIMBF4)中的电还原行

王欢; 薛腾; 张爱健; 张丽; 陆嘉星   

  1. 上海市绿色化学与化学工程绿色化重点实验室, 华东师范大学化学系, 上海 200062
  • 收稿日期:2005-05-27 修回日期:1900-01-01 出版日期:2006-06-10 发布日期:2006-06-10
  • 通讯作者: 陆嘉星

Electroreduction Behavior of Coumarin in an Ionic Liquid(BMIMBF4)

WANG Huan; XUE Teng; ZHANG Ai-Jian; ZHANG Li; LU Jia-Xing*   

  1. Shanghai Key Laboratory of Green Chemistry and Chemical Process. East China Normal University, Shanghai 200062, China
  • Received:2005-05-27 Revised:1900-01-01 Online:2006-06-10 Published:2006-06-10
  • Contact: LU Jia-Xing

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摘要： 室温离子液体由大的有机阳离子(咪唑、吡啶、季铵和季等)和各种各样的阴离子[AlCl-4, PF-6, BF-4, CF3SO-3, (CF3SO3)2N-等]组成, 是一种新型的溶剂, 具有稳定性好、蒸气压小、毒性小和不易燃等优异的物理化学性质, 已引起了人们的广泛关注. 因而在这种新型溶剂中进行有机物电化学行为的研究, 用于评价其作为“绿色”电化学或新型电化学反应的可行性很有必要.

关键词: 离子液体, 电还原, 香豆素

Abstract: The electrochemical reduction of coumarin at GC electrode in 1-n-butyl-3-methylimidazolium tetrafluoroborate(BMIMBF4) room temperature ionic liquid is reported. Coumarin exhibits a one-electron, irreversible reduction to caroanion radical, and the latter species undergoes fast dimerization to dihydrodimer. The influences of scan rate, concentration and temperature were studied by cyclic voltammetry. The results show that the reaction is diffusion controlled. The diffusion coefficient D of coumarin in BMIMBF4 from Chronocoulometry is 5.066×10-7 cm2/s. Furthermore, the influences of water and substituting group during the electroreduction are discussed. These preliminary electrochemical experiments show encouraging results for the use of ionic liquids in a "green" electrochemistry.

Key words: Ionic liquid, Electroreduction, Coumairn

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