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

• Antragsteller: Professor Dr. Hermann Weingärtner
• Fachliche Zuordnung: Physikalische Chemie von Molekülen, Flüssigkeiten und Grenzflächen, Biophysikalische Chemie
• Förderung: Förderung von 2006 bis 2015
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 29179964

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.

• DFG-Verfahren: Schwerpunktprogramme
• Teilprojekt zu: SPP 1191: Ionische Flüssigkeiten