Thermodynamic properties of the N-octylquinolinium bis{(trifluoromethyl)sulfonyl}imide |
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| Institution: | 1. Department of Physical Chemistry, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland;2. Thermodynamic Research Unit, School of Chemical Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4001, South Africa;1. International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;2. CREST, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan;3. Materials Processing Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;4. Environmental Remediation Materials Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;5. Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, United States;1. Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, HU-1521 Budapest, Hungary;2. Research Center for Natural Sciences, Hungarian Academy of Science, HU-1117 Budapest, Hungary;3. Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, HU-1111, Budapest, Hungary;1. School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;2. Shanghai Key Laboratory of Chemical Biology, Institute of Pesticides & Pharmaceuticals, East China University of Science and Technology, Shanghai 200237, China;1. Faculty of Physics Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland;2. Institute of Agricultural and Food Biotechnology, Department of Meat and Fat Technology, Jubilerska 4, 04-190 Warsaw, Poland |
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| Abstract: | This work is a continuation of our wide ranging investigation on quinolinium based ionic liquids (ILs). The study includes specific basic characterisation of the synthesized compounds N-octylquinolinium bromide, OQuin]Br] and N-octylquinolinium bis{(trifluoromethyl)sulfonyl}imide OQuin]NTf2] by NMR spectra, elementary analysis and water content. Differential scanning calorimetry (DSC) measurements gave us properties of the pure OQuin]NTf2] i.e. melting and glass-transition temperatures, the enthalpy of fusion as well as heat capacity at the glass transition. Densities and viscosities were determined as a function of temperature. The temperature-composition phase diagrams of 10 binary mixtures composed of organic solvent dissolved in the IL: {OQuin]NTf2] + aromatic hydrocarbon (benzene, or thiophene, or toluene, or ethylbenzene, or n-propylbenzene), or an alcohol (1-butanol, or 1-hexanol, or 1-octanol, or 1-decanol, or 1-dodecanol)} were measured at ambient pressure. A dynamic method was used over a broad range of mole fractions and temperatures from (250 to 370) K. For mixtures with benzene and alkylbenzenes, the immiscibility gap in the liquid phase in a low mole fraction of the IL was observed with upper critical solution temperature (UCST) higher than the boiling point of the solvent. In the system with thiophene, the immiscibility gap is lower and UCST was measured. For binary mixtures with alcohols, complete miscibility in the liquid phase was observed for 1-butanol and 1-hexanol. In the systems with longer chain alcohols, the immiscibility gap with UCST was noted. Typical behaviour for ILs was observed with an increase of the chain length of an alcohol the solubility decreases. The well-known NRTL equation was used to correlate experimental (solid + liquid), SLE and (liquid + liquid), LLE phase equilibrium data sets. |
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