title: New water-stable ionic liquids based on tetrakis-(2,2,2-trifluoroethoxy)borate.
abstract: Several new ionic liquids (ILs) were prepared from Na[B(tfe)4] (tfe=OCH2 CF3 ) via metathesis, including one room temperature IL (RTIL). Prior to synthesis, suitable cations were chosen via predictive quantum-chemical calculations. Nuclear magnetic resonance monitoring over almost a month showed a total stability of the anion in the presence of water. The temperature-dependent viscosities and melting points of all the new ILs were determined. The data indicate that [B(tfe)4 ](-) ILs may be too viscous for electrochemical applications, but are interesting candidates for lubricant research.
authors.affiliation: Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität, Albertstraße 21, 79104 Freiburg (Germany); Freiburger Materialforschungszentrum, Stefan-Meier-Straße 21, 79104 Freiburg (Germany).
authors.forename: Alexander B A
authors.initials: AB
authors.lastname: Rupp
authors.forename: Petra
authors.initials: P
authors.lastname: Klose
authors.forename: Harald
authors.initials: H
authors.lastname: Scherer
authors.forename: Ingo
authors.initials: I
authors.lastname: Krossing
keywords: NMR spectroscopy; density functional calculations; ion pairs; ionic liquids; synthesis