Thermodynamic properties of the N-butylisoquinolinium bis(trifluoromethylsulfonyl)imide

Urszula Domańska-Żelazna , Maciej Zawadzki

Abstract

A new isoquinolinium ionic liquid (IL) has been synthesised as a continuation of our work with quinolinium-based ionic liquids (ILs). The work includes specific basic characterization of synthesized compounds: N-isobutylquinolinium bromide, [BiQuin][Br] and N-isobutylquinolinium bis\(trifluoromethyl)sulfonyl\imide [BiQuin][NTf2] by NMR spectra, elementary analysis and water content. The basic thermal properties of the pure [BiQuin][NTf2], i.e. melting and glass-transition temperatures, the enthalpy of fusion as well as heat capacity at glass transition have been measured using a differential scanning microcalorimetry technique (DSC). Densities and viscosities were determined as a function of temperature. The temperature-composition phase diagrams of 8 binary mixtures composed of organic solvent dissolved in the IL: \[BiQuin][NTf2] + aromatic hydrocarbon (benzene, or toluene, or ethylbenzene, or n-propylbenzene), or an alcohol (1-butanol, or 1-hexanol, or 1-octanol, or 1-decanol)\ were measured at ambient pressure. A dynamic method was used over a broad range of mole fraction and temperature from (270 to 320) K. For all the binary systems with benzene and alkylbenzenes, the eutectic diagrams were observed with an immiscibility gap in the liquid phase existing at low mole fraction of the IL with a very high upper critical solution temperature (UCST). For mixtures with alcohols, complete miscibility was observed for 1-butanol and also an immiscibility gap with UCST in the liquid phase for the remaining alcohols. The typical dependence was observed that with increasing 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.
Author Urszula Domańska-Żelazna (FC / DPC)
Urszula Domańska-Żelazna,,
- Department Of Physical Chemistry
, Maciej Zawadzki (FC / DPC)
Maciej Zawadzki,,
- Department Of Physical Chemistry
Journal seriesJournal of Chemical Thermodynamics, ISSN 0021-9614, (A 35 pkt)
Issue year2011
Vol43
No6
Pages989-995
Keywords in EnglishBinary solid or (liquid + liquid) phase equilibria diagrams, [BiQuin][NTf2], Correlation, Density, Thermodynamics, viscosity
ASJC Classification1606 Physical and Theoretical Chemistry; 2500 General Materials Science; 3107 Atomic and Molecular Physics, and Optics
DOIDOI:10.1016/j.jct.2011.02.006
URL http://www.sciencedirect.com/science/article/pii/S0021961411000425
Languageen angielski
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1-s2.0-S0021961411000425-main.pdf 608.17 KB
Score (nominal)35
Score sourcejournalList
Publication indicators Scopus Citations = 20; GS Citations = 10.0; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 1.294; WoS Impact Factor: 2011 = 2.422 (2) - 2011=2.173 (5)
Citation count*10 (2015-03-08)
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