Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
J Phys Chem B. 2012 Sep 6;116(35):10870-5. doi: 10.1021/jp301658k. Epub 2012 Aug 24.
X-ray photoelectron spectroscopy (XPS) was applied to a neat ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [EMI(+)][Tf(2)N(-)] and its lithium salt solution at room temperature to clarify the composition and structure of its near-surface region. Core level peaks were recorded for Li 1s, N 1s, C 1s, F 1s, O 1s, S 2s, and S 2p. Valence band XPS spectra (0-40 eV binding energy) were also studied. The XPS spectra were analyzed using DV-Xα calculations. Results show that the planar type isomer of the EMI(+) cation is dominant at the near-surface region of EMI-Tf(2)N. Results of XPS measurements show a spectrum of Li 1s in Li/EMI-Tf(2)N. The proposed models for the preferred orientation of the ions exhibit good agreement with results obtained from the DV-Xα calculations.
X 射线光电子能谱（XPS）被应用于室温下的纯离子液体 1-乙基-3-甲基咪唑双（三氟甲烷磺酰基）亚胺[EMI(+)][Tf(2)N(-)]及其锂盐溶液，以阐明其近表面区域的组成和结构。记录了 Li 1s、N 1s、C 1s、F 1s、O 1s、S 2s 和 S 2p 的芯能级峰。还研究了价带 XPS 光谱（0-40 eV 结合能）。XPS 光谱使用 DV-Xα 计算进行分析。结果表明，EMI(+)阳离子的平面型异构体在 EMI-Tf(2)N 的近表面区域占主导地位。XPS 测量结果显示了 Li/EMI-Tf(2)N 中 Li 1s 的光谱。离子优选取向的建议模型与 DV-Xα 计算得到的结果吻合良好。
