Ionic Structures of Nanobased FeCl3/[C4mim]Cl Ionic Liquids

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• 作者：Ji-Guang Li ; Yu-Feng Hu ; Shu-Feng Sun ; Shan Ling ; Jin-Zhu Zhang
• 刊名：The Journal of Physical Chemistry B
• 出版年：2012
• 出版时间：June 7, 2012
• 年：2012
• 卷：116
• 期：22
• 页码：6461-6464
• 全文大小：293K
• 年卷期：v.116,no.22(June 7, 2012)
• ISSN：1520-5207

文摘

We synthesized a series of FeCl₃/[C₄mim]Cl (iron(III) chloride with 1-butyl-3-methylimidazolium chloride) ionic liquids. The temperature dependence of the Raman spectra of the FeCl₃/[C₄mim]Cl ionic liquids was measured for the first time to analyze their ionic species. In addition, the infrared spectra, thermodynamic properties, and freeze-fracture transmission electron microscopy were combined together with the Raman spectra to reveal the microscopic information of the FeCl₃/[C₄mim]Cl ionic liquids. When the mole ratio of FeCl₃/[C₄mim]Cl is less than 1, the Raman scattering identifies the presence of [FeCl₄]^{鈭?/sup> in the ionic liquid. When FeCl₃ is in excess, [Fe₂Cl₇]鈭?/sup> begins to appear. Besides, we found that the relative intensity of the two symmetry vibrations of [Fe₂Cl₇]鈭?/sup> is changing as the temperature is varied. The strength of the interionic interactions in FeCl₃/[C₄mim]Cl ionic liquids follows the order 1/1.5 > 1.5/1 > 1/1 due to the formation of [FeCl₄]鈭?/sup> and [Fe₂Cl₇]鈭?/sup>. The nanostructures in FeCl₃/[C₄mim]Cl ionic liquids were observed for the first time by using biological imaging. The sizes of the local domains are found to be tens of nanometers.}