Dielectric spectroscopy of ion pairing and ion clustering in mixtures of ionic liquids with molecular solvents

离子液体与分子溶剂混合物中离子对和离子簇的介电谱

• 批准号: 29179964
• 负责人: Professor Dr. Hermann Weingärtner
• 金额: --
• 依托单位: Lehrstuhl für Physikalische Chemie II: Laserspektroskopie und Biophotonik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/29179964?language=en
• 关键词: Dielectric; spectroscopy; ion; pairing; clustering

The project aims at characterizing the static and frequency-dependent dielectric permittivity of neat low-viscosity room-temperature ionic liquids and their mixtures with solvents of low polarity. Experiments for mixtures will be conducted over the entire composition range from dilute solutions to the neat ionic liquids, thus covering the transition of typical electrolyte solution behavior to molten salt behaviour. The experiments will provide information on the dynamics of ions and the formation, ordering and dynamics of ion pairs and larger ion clusters. Zerofrequency extrapolation of the dielectric permittivity will provide the static dielectric constant, which for electrically conductive systems is not accessible by conventional methods. The static dielectric constant is a key quantity for assessing the polarity of a solvent and an important input quantity for modellings of thermodynamic and transport coefficient data.

该项目旨在表征整齐的低粘度室 - 温度离子液体及其混合物的静态和频率依赖性介电介电常数，其混合物具有低极性的溶剂。混合物的实验将在整个组成范围内进行，从稀释溶液到整洁的离子液体，从而涵盖了典型的电解质溶液行为向熔融盐行为的过渡。实验将提供有关离子动力学以及离子对和较大离子簇的形成，顺序和动力学的信息。介电介电常数的频频外推将提供静态介电常数，对于传统方法，无法通过传统导电系统访问它。静态介电常数是评估溶剂的极性和热力学和运输系数数据模块的重要输入量的关键量。