title: Thermodynamics of Imidazolium-Based Ionic Liquids Containing PF6 Anions.
abstract: Imidazolium-based ionic liquids (ILs) with PF6(-) anions are considered as low-cost solvents for separation processes, but they exhibit restricted thermal stabilities. Reliable measurements of vaporization thermodynamics by conventional methods have failed. In this work, we applied a quartz-crystal microbalance method to determine for the first time the absolute vapor pressures for the [Cnmim][PF6] family, with n = 2, 4, 6, 8, and 10, in the temperature range 403-461 K. An absence of decomposition of ILs in experimental conditions was determined by the attenuated total reflection-infrared spectroscopy. The consistency of the experimental results within the homologous series was established through enthalpy and entropy analyses of the liquid and gas phases as well as by molecular dynamics simulations.
authors.forename: Dzmitry H
authors.initials: DH
authors.lastname: Zaitsau
authors.forename: Andrei V
authors.initials: AV
authors.lastname: Yermalayeu
authors.affiliation: Department of Physical Chemistry, Kazan Federal University , Kremlevskaya str. 18, 420008 Kazan, Russia.
authors.forename: Vladimir N
authors.initials: VN
authors.lastname: Emel'yanenko
authors.affiliation: Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt , Alarich-Weiss-Str. 4, 64287 Darmstadt, Germany.
authors.forename: Simon
authors.initials: S
authors.lastname: Butler
authors.affiliation: IoLiTec Ionic Liquids Technologies GmbH , Salzstrasse 184, D-74076 Heilbronn, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Schubert
authors.forename: Sergey P
authors.initials: SP
authors.lastname: Verevkin