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中文摘要：
利用X射线吸收精细结构光谱（XAFS）及紫外吸收光谱两种方法，分析了离子液体1-丁基-3-甲基咪唑溴盐（[BMIM]Br）中逐渐掺入1-丁基-3-甲基咪唑四氟硼酸盐（[BMIM][BF4]）时，Br^-阴离子与咪唑阳离子之间氢键作用及电荷偏移量的改变．随着[BMIM][BF4]加入量增多，Br元素XAFS近边（XANES）显示吸收峰降低，吸收边位置向低能端位移0．9eV；扩展边（EXAFS）算出径向结构显示Br与近邻原子问平均配位数降低、平均键长增长：紫外光谱也有明显蓝移减色效应．这些结果都表明BF2的掺入改变了Br与阳离子间的电荷偏移量，负电荷更多地转移到Br^-上，量化计算的数据同样支持该结论．
英文摘要：
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] [BF,]） using X-ray absorption fine structure （XAFS） and ultraviolet absorption spectroscopies. As the content of [BMIM][BF,] 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][BF,] increased. All of these results indicate that more negative charge was transferred to Br- as the content of [BMIM][BF,] increased. The data obtained from quantum chemical calculations also support this conclusion.
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