In the footsteps of August Michaelis: Syntheses and Thermodynamics of Extremely Low‐Volatile Ionic Liquids
Dr. Dzmitry H. Zaitsau,
Dr. Anke Topp,
Dr. Antje Siegesmund,
Ayla Päpcke,
Prof. Dr. Martin Köckerling,
Prof. Dr. Sergey P. Verevkin
Affiliations
Dr. Dzmitry H. Zaitsau
Department of Physical Chemistry and Faculty of Interdisciplinary Research Competence Centre CALOR University of Rostock Dr.-Lorenz-Weg 2 18059 Rostock Germany
Dr. Anke Topp
Department of Inorganic Chemistry Solid State Chemistry Group and Faculty of Interdisciplinary Research University of Rostock Albert-Einstein-Str. 3a 18059 Rostock Germany
Dr. Antje Siegesmund
Department of Inorganic Chemistry Solid State Chemistry Group and Faculty of Interdisciplinary Research University of Rostock Albert-Einstein-Str. 3a 18059 Rostock Germany
Ayla Päpcke
Department of Inorganic Chemistry Solid State Chemistry Group and Faculty of Interdisciplinary Research University of Rostock Albert-Einstein-Str. 3a 18059 Rostock Germany
Prof. Dr. Martin Köckerling
Department of Inorganic Chemistry Solid State Chemistry Group and Faculty of Interdisciplinary Research University of Rostock Albert-Einstein-Str. 3a 18059 Rostock Germany
Prof. Dr. Sergey P. Verevkin
Department of Physical Chemistry and Faculty of Interdisciplinary Research Competence Centre CALOR University of Rostock Dr.-Lorenz-Weg 2 18059 Rostock Germany
Abstract A series of nine different known ionic liquids or low melting salts was synthesised and purified. They are composed of the [NTf2]– (bis(trifluoromethane)sulfonimide), [OTf]– (trifluoro‐methane‐sulfonate), or [B(CN)4]– (tetracyanidoborate) anion and [Ph4P]+ (tetraphenylphosphonium), [Ph3BzP]+ (triphenylbenzyl phosphonium), [nBu4P]+ (tetra‐nbutylphosphonium), [nBuPh3P]+ (tri‐phenyl‐nbutylphosphonium), [nBu4N]+ (tetra‐nbutylammonium), or the [PPN]+ (bis(triphenylphosphine)iminium) cation. Precise vapour pressure data and enthalpies of vaporisation were measured using the Quartz Crystal Microbalance (QCM) method and evaluated. Structure‐property relations are established using the obtained data as well as literature known data of ILs with alkyl‐substituted imidazolium cations. It turns out that ILs with the tetracyanidoborate anion have even higher values of the enthalpy of vaporisation than those with the common [NTf2]− or [OTf]− anion and therefore are even less volatile.
