Functionalization of Oxide Surfaces through Reaction with 1,3-Dialkylimidazolium Ionic Liquids
Functionalization of Oxide Surfaces through Reaction with 1,3-Dialkylimidazolium Ionic Liquids
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DOI：
10.1021/jz301856a
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发表时间：
2013-01-03
影响因子：
5.7
通讯作者：
Libuda, Joerg
中科院分区：
文献类型：
--
作者：
Schernich, Stefan;Laurin, Mathias;Libuda, Joerg
离子液体的实际应用通常涉及离子液体/氧化物界面，但对其界面化学性质知之甚少。ILs不同寻常的物理化学性质，包括其极低的蒸汽压，为在超高真空（UHV）下使用表面科学方法获得这种界面提供了可能。应用同步辐射光电子能谱（SR-PES）研究了在特高压下原位制备的离子液体[C(6)C(1)Im][Tf2N]在有序化学计量CeO2（111）和部分还原CeO2-x上的薄膜。在部分还原的表面上，我们主要观察到阴离子的分解。然而，在化学计量的CeO2（111）表面，一层具有高热稳定性的表面锚定有机产物在阳离子的反应下形成。建议的酸碱反应途径可能在碱性氧化物上提供明确的功能化IL/固体界面。
Practical applications of ionic liquids (ILs) often involve IL/oxide interfaces, but little is known regarding their interfacial chemistry. The unusual physicochemical properties of ILs, including their exceptionally low vapor pressure, provide access to such interfaces using a surface science approach in ultrahigh vacuum (UHV). We have applied synchrotron radiation photoelectron spectroscopy (SR-PES) to the study of a thin film of the ionic liquid [C(6)C(1)Im][Tf2N] prepared in situ in UHV on ordered stoichiometric CeO2(111) and partially reduced CeO2-x. On the partially reduced surface, we mostly observe decomposition of the anion. On the stoichiometric CeO2(111) surface, however, a layer of surface-anchored organic products with high thermal stability is formed upon reaction of the cation. The suggested acid-base reaction pathway may provide well-defined functionalized IL/solid interfaces on basic oxides.