Citation: MA Jing-Yuan, ZOU Yang, JIANG Zheng, HUANG Yu-Ying. Effect of the Ratio between Ionic Liquids [BMIM]Br and [BMIM][BF₄] on the Charge Transfer of Br^-[J]. Acta Physico-Chimica Sinica, ;2013, 29(08): 1618-1622. doi: 10.3866/PKU.WHXB201305272 shu

Effect of the Ratio between Ionic Liquids [BMIM]Br and [BMIM][BF₄] on the Charge Transfer of Br^-

1.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China

Received Date: 25 March 2013
Available Online: 27 May 2013
Fund Project: 国家自然科学基金(11079007, 11005148, 10705046) (11079007, 11005148, 10705046)中国科学院知识创新工程重大交叉项目(KJCX2-YW-N43)资助 (KJCX2-YW-N43)

We analyzed the change of hydrogen bonding between Br^- and imidazolium cations when the ionic liquid 1-butyl-3-methylimidazolium bromide ([BMIM]Br) was gradually mixed with 1-butyl-3- methylimidazolium tetrafluoroborate ([BMIM] [BF₄]) using X-ray absorption fine structure (XAFS) and ultraviolet absorption spectroscopies. As the content of [BMIM][BF₄] increased, the intensity of the K-edge main peak of Br reduced in X-ray absorption near edge structure (XANES) spectra, and the absorption edge moved 0.9 eV to lower energy. Meanwhile, the radial structure given by extended X-ray absorption fine structure (EXAFS) indicated that the distribution number reduced and average hydrogen bond length increased. UV spectra showed a clear blue shift and peaks decreased in intensity as the content of [BMIM][BF₄] increased. All of these results indicate that more negative charge was transferred to Br^- as the content of [BMIM][BF₄] increased. The data obtained from quantum chemical calculations also support this conclusion.
- Ionic liquid,
- Charge transfer,
- X-ray absorption fine structure spectroscopy,
- Absorption edge,
- UV spectroscopy
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of the Ratio between Ionic Liquids [BMIM]Br and [BMIM][BF4] on the Charge Transfer of Br-

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通讯作者: 陈斌, bchen63@163.com

Effect of the Ratio between Ionic Liquids [BMIM]Br and [BMIM][BF₄] on the Charge Transfer of Br^-