Phase Equilibria in Ionic Liquid-Aromatic Compound Mixtures, Including Benzene Fluorination Effects
Phase Equilibria in Ionic Liquid-Aromatic Compound Mixtures, Including Benzene Fluorination Effects
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DOI：
10.1021/jp902178g
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发表时间：
2009-05-28
影响因子：
3.3
通讯作者：
Rebelo, Luis Paulo N.
中科院分区：
文献类型：
--
作者：
Blesic, Marijana;Canongia Lopes, Jose N.;Rebelo, Luis Paulo N.
这项工作通过确定含有离子液体和氟化苯的混合物的固-液和液-液相图，扩展了以前研究离子液体与苯或其衍生物的混合物的相行为的范围。研究的体系包括1-乙基-3-甲基咪唑鎓双(三氟甲磺酰基)亚胺加六氟苯或1,3,5-三氟苯和1-乙基-3-甲基咪唑鎓三氟甲磺酸盐或N-乙基-N-甲基吡咯烷鎓双(三氟甲磺酰基)亚胺加苯。相图表现出不同类型的固液行为：（通常）出现共晶点； （不常见的）同成分熔点的存在以及相应的夹杂晶体的形成；或不同离子液体结晶相的观察（多晶型现象）。这些不同类型的行为由结晶过程中的温度退火或芳香族化合物的性质控制，并且可以在分子水平上解释，考虑晶体或液体混合物的结构，以及离子液体的独特特性，即它们与芳香族化合物相互作用的双重性质。
This work extends the scope of previous studies oil the phase behavior of mixtures of ionic liquids with benzenes or its derivatives by determining the solid-liquid and liquid-liquid phase diagrams of mixtures containing, an ionic liquid and a fluorinated benzene. The systems studied include 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide plus hexafluorobenzene or 1,3,5-trifluorobenzene and 1-ethyl-3-methylimidazolium triflate or N-ethyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide plus benzene. The phase diagrams exhibit different kinds of solid-liquid behavior: the (usual) occurrence of eutectic points; the (not-so-usual) presence of congruent melting points and the corresponding formation of inclusion crystals; or the observation of different ionic liquid crystalline phases (polymorphism). These different types of behavior call be controlled by temperature annealing during crystallization or by the nature of the aromatic compound and can be interpreted, at a molecular level, taking into account the structure of the crystals or liquid mixtures, together with the unique characteristics of ionic liquids, namely the dual nature of their interactions with aromatic compounds.