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Solid–liquid equilibria of binary mixtures of fluorinated ionic liquids

机译：氟化离子液体的二元混合物的固液平衡

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摘要

Within ionic liquids, fluorinated ionic liquids (FILs) present unique physico-chemical properties and potential applications in several fields. However, the melting point of these neoteric compounds is usually higher due to the presence of fluorine atoms. This drawback may be resolved by, for instance, mixing different FILs to create eutectic mixtures. In this work, binary mixtures of fluoro-containing and fluorinated ionic liquids were considered with the aim of decreasing their melting temperatures as well as understanding and characterizing these mixtures and their phase transitions. Five FILs were selected, allowing the investigation of four binary mixtures, each of them with a common ion. Their solid–liquid and solid–solid equilibria were studied by differential scanning calorimetry and the non-ideality of the mixtures was investigated. Overall, a variety of solid–liquid equilibria with systems exhibiting eutectic behavior, polymorphs with solid–solid phase transitions, and the formation of intermediate compounds and solid solutions were surprisingly found. In addition to these intriguing behaviours, novel FILs with lower melting temperatures were obtained by the formation of binary systems, thus enlarging the application range of FILs at lower temperatures.
机译：在离子液体中，氟化离子液体（FIL）具有独特的理化特性，并在多个领域中都有潜在的应用。然而，由于氟原子的存在，这些新型化合物的熔点通常更高。该缺点可以通过例如混合不同的FIL以产生低共熔混合物来解决。在这项工作中，考虑了含氟和氟化离子液体的二元混合物，目的是降低它们的熔融温度，并了解和表征这些混合物及其相变。选择了五个FIL，可以研究四种二元混合物，每种混合物具有一个共同的离子。通过差示扫描量热法研究了它们的固-液和固-固平衡，并研究了混合物的非理想性。总体而言，令人惊讶地发现，各种固液平衡体系表现出共晶行为，具有固固相变的多晶型物以及中间体化合物和固溶体的形成。除了这些有趣的行为外，通过形成二元体系还获得了具有较低熔融温度的新型FIL，从而扩大了FIL在较低温度下的应用范围。

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