Thermally-Stable Imidazolium Dicationic Ionic Liquids with Pyridine Functional Groups
Thermally-Stable Imidazolium Dicationic Ionic Liquids with Pyridine Functional Groups
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DOI：
10.1021/acssuschemeng.0c02473
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发表时间：
2020-06-15
影响因子：
8.4
通讯作者：
Licence, Peter
中科院分区：
文献类型：
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作者：
Clarke, Coby J.;Bui-Le, Liem;Licence, Peter
热稳定离子液体（ILs）结构可能性有限，缺乏配位阴离子或官能团。热稳定性实际上导致了可调性损失，限制了离子液体的功能，使它们成为简单的热稳定流体。本文提出了一系列具有吡啶官能团的新型热稳定定向离子液体，缩写为[(C(8)ImC(1))(2)Py][a](2)，并将其与非官能团二元定向离子液体进行了比较。所有的il都进行了热表征，以了解它们的高温稳定性和导致它们分解的过程。重要的是，具有非配位阴离子（即[NTf2](-)）的功能化[(C(8)ImC(1))(2)Py][A](2)具有与双极性偶联il相当的热稳定性，并具有功能吡啶部分的优势。研究了Zn[NTf2](2)在[(C(8)ImC(1))(2)Py][NTf2](2)中的溶解作用，并对得到的溶液进行了表征，表明其具有液体性质、高热稳定性和金属中心与官能团的配位性。这是热稳定功能性IL的第一个例子，它有可能在高温下恢复IL的可调、特定任务性质。重要的是，这些特性通过扩展其工作范围，为IL的高温应用开辟了新的途径；催化、金属修复和基于分离的应用是潜在的关键改进领域。
Thermally-stable ionic liquids (ILs) have limited structural possibilities and lack coordinating anions or functional groups. Thermal stability effectively incurs a tunability penalty, limiting ionic liquid function to render them as simple heat-stable fluids. In this work, a series of new thermally-stable dicationic ionic liquids with pyridine functional groups, abbreviated [(C(8)ImC(1))(2)Py][A](2), are presented and compared to nonfunctional geminal dicationic ILs. All ILs have been thermally characterized to understand their elevated temperature stabilities and the processes that lead to their decomposition. Importantly, functional [(C(8)ImC(1))(2)Py][A](2) with noncoordinating anions (i.e., [NTf2](-)) have thermal stabilities comparable to those of geminal dicationic ILs, with the added advantage of a functional pyridine moiety. Dissolution of Zn[NTf2](2) in [(C(8)ImC(1))(2)Py][NTf2](2) is demonstrated, and the resulting solutions are characterized to show their liquid properties, high thermal stabilities, and the coordination of the metal center to the functional group. This is the first example of a thermally-stable functional IL with the potential to reclaim the tunable, task-specific nature of ILs at elevated temperatures. Importantly, these properties open new avenues for high-temperature applications of IL by extending their operational ranges; catalysis, metal remediation, and separation-based applications are potential key areas of improvement.