On the Dynamic Interaction of n-Butane with Imidazolium-Based Ionic Liquids.,Angewandte Chemie International Edition

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On the Dynamic Interaction of n-Butane with Imidazolium-Based Ionic Liquids.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-05-19 , DOI: 10.1002/anie.202005991
Radha G Bhuin ₁ , Leonhard Winter ₁ , Matthias Lexow ₁ , Florian Maier ₁ , Hans-Peter Steinrück ₁

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The impact of a reactant from the gas phase on the surface of a liquid and its transfer through this gas/liquid interface are crucial for various concepts applying ionic liquids (ILs) in catalysis. We investigated the first step of the adsorption dynamics of n‐butane on a series of 1‐alkyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imide ILs ([C_nC₁Im][Tf₂N]; n =1, 2, 3, 8). Using a supersonic molecular beam in ultra‐high vacuum, the trapping of n‐butane on the frozen ILs was determined as a function of surface temperature, between 90 and 125 K. On the C₈‐ and C₃‐ILs, n‐butane adsorbs at 90 K with an initial trapping probability of ≈0.89. The adsorption energy increases with increasing length of the IL alkyl chain, whereas the ionic headgroups seem to interact only weakly with n‐butane. The absence of adsorption on the C₁‐ and C₂‐ILs is attributed to a too short residence time on the IL surface to form nuclei for condensation even at 90 K.

中文翻译：

正丁烷与咪唑基离子液体的动态相互作用

气相反应物对液体表面的影响及其通过该气/液界面的转移对于在催化中应用离子液体（IL）的各种概念至关重要。我们研究了正丁烷在一系列1-烷基-3-甲基咪唑鎓双（三氟甲磺酰基）酰亚胺ILs [[C _n C ₁ Im] [Tf ₂ N]; n = 1，2， 3，8）。在超高真空下使用超声波分子束，确定了冷冻ILs上正丁烷的捕集量与表面温度的函数关系，介于90和125 K之间。在C _8-和C ₃ -ILs上，n丁烷在90 K时吸附，初始俘获概率约为0.89。吸附能随着IL烷基链长度的增加而增加，而离子头基似乎只与正丁烷发生微弱的相互作用。C _1-和C ₂ -IL上不存在吸附的原因是，即使在90 K时，在IL表面的停留时间也太短，无法形成可凝结的核。

更新日期：2020-05-19

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