title: Preparation of [Al(hfip)4](-)-based ionic liquids with siloxane-functionalized cations and their physical properties in comparison with their [Tf2N]- analogues.
abstract: Two new ionic liquids (ILs) with siloxane-functionalized cations and the weakly coordinating tetraalkoxyaluminate [Al(hfip)(4)](-) (hfip=hexafluoroisopropoxy) are prepared and characterized by nuclear magnetic resonance (NMR), infrared (IR) and Raman spectroscopy. With melting points below 0 °C they qualify as room temperature ILs (RTILs). Their temperature-dependent viscosities and conductivities, together with those of two [Tf(2)N](-) ILs with the same cations and a further siloxane-functionalized [Tf(2)N](-) IL, are measured between 0 and 80 °C, and all are described by the Vogel-Fulcher-Tammann (VFT) equations. We note that the [Al(hfip)(4)](-) ILs have lower viscosities than their [Tf(2)N](-) analogues at all measured temperatures and higher conductivities at room temperature.
authors.affiliation: Albert-Ludwigs-Universität Freiburg, Institut für Anorganische und Allgemeine Chemie and Freiburger Materialforschungszentrum, Albertstr. 21, 79104 Freiburg, Germany.
authors.forename: Safak
authors.initials: S
authors.lastname: Bulut
authors.forename: M A
authors.initials: MA
authors.lastname: Ab Rani
authors.forename: Tom
authors.initials: T
authors.lastname: Welton
authors.forename: Paul D
authors.initials: PD
authors.lastname: Lickiss
authors.forename: Ingo
authors.initials: I
authors.lastname: Krossing