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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Identification of 1,3-Dialkylimidazolium Salt Supramolecular Aggregates in Solution
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Identification of 1,3-Dialkylimidazolium Salt Supramolecular Aggregates in Solution

机译：溶液中1,3-二烷基咪唑鎓盐超分子聚集体的鉴定

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摘要

The nature of the interactions between 1,3-dialkylimidazolium cations and noncoordinating anions such as tetrafluoroborate,hexafluorophosphate,and tetraphenylborate has been studied in the solid state by X-ray diffraction analysis and in solution by ~1H NMR spectroscopy,conductivity,and microcalorimetry.In the solid state,these compounds show an extended network of hydrogen-bonded cations and anions in which one cation is surrounded by at least three anions and one anion is surrounded by at least three imidazolium cations.In the pure form,imidazolium salts are better described as polymeric supramolecules of the type {[(DAI)_3(X)]~(2+)[(DAI)(X)_3]~(2-)}_n (where DAI is the dialkylimidazolium cation and X is the anion) formed through hydrogen bonds of the imidazolium cation with the anion.In solution,this supramolecular structural organization is maintained to a great extent,at least in solvents of low dielectric constant,indicating that mixtures of imidazolium ionic liquids with other molecules can be considered as nanostructured materials.This model is very useful for the rationalization of the majority of the unusual behavior of the ionic liquids.
机译：通过X射线衍射分析以及溶液的〜1H NMR光谱，电导率和微量量热法研究了1,3-二烷基咪唑鎓阳离子与非配位阴离子如四氟硼酸根，六氟磷酸根和四苯基硼酸根之间的相互作用的性质。在固态下，这些化合物显示出氢键结合的阳离子和阴离子的扩展网络，其中一个阳离子被至少三个阴离子包围，而一个阴离子被至少三个咪唑阳离子包围。在纯净形式下，咪唑鎓盐更好描述为{[（（DAI）_3（X）]〜（2 +）[（DAI）（X）_3]〜（2-）} _ n类型的聚合物超分子（其中DAI是二烷基咪唑鎓阳离子，X是阴离子在溶液中，至少在低介电常数的溶剂中，这种超分子结构在很大程度上得以保持，这表明咪唑离子液体与其他离子的混合物分子可以被认为是纳米结构材料。该模型对于合理化大多数离子液体的异常行为非常有用。

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