In the footsteps of August Michaelis: Syntheses and Thermodynamics of Extremely Low‐Volatile Ionic Liquids

Autor: Zaitsau, Dzmitry H., Topp, Anke, Siegesmund, Antje, Päpcke, Ayla, Köckerling, Martin, Verevkin, Sergey P.
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: ChemistryOpen
ChemistryOpen, Vol 10, Iss 2, Pp 243-247 (2021)
ISSN: 2191-1363
Popis: 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.
Finding the right H: An accurate determination of the vaporisation enthalpy is crucial given the use of low‐volatile ionic liquids for industrial applications, These values have been determined for nine known ionic liquids, five of which contain the thermally extreme robust tetracyanidoborate anion.
Databáze: OpenAIRE
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