The effect of the cation aromaticity upon the thermophysical properties of piperidinium- and pyridinium-based ionic liquids
authors Bhattacharjee, A; Carvalho, PJ; Coutinho, JAP
nationality International
journal FLUID PHASE EQUILIBRIA
author keywords Ionic liquids; Density; Viscosity; Surface tension; Refractive index
keywords EXTENDED PRESSURE RANGE; THERMODYNAMIC PROPERTIES; SURFACE-TENSION; TRANSPORT-PROPERTIES; PHYSICAL-PROPERTIES; BIS(TRIFLUOROMETHYLSULFONYL) IMIDE; PHYSICOCHEMICAL PROPERTIES; REFRACTIVE-INDEXES; BINARY-MIXTURES; IMIDAZOLIUM
abstract Experimental data on density, viscosity, refractive index and surface tension of four ILs: 1-Methyl-1-propylpiperidinium bis(trifluoromethylsulfonyl)imide [C(3)C(1)Pip][NTf2], 1-Butyl-1-methylpiperidinium bis(trifluoromethylsulfonyl)imide [C(4)C(1)Pip][NTf2], 3-Methyl-1-propylpyridinium bis(trifluoromethylsulfonyl)imide [C3C1Py][NTf2] and 1-Butyl-3-methylpyridinium bis(trifluoromethylsulfonyl)imide [C4C1Py][NTf2] were measured in the temperature range between 288.15 and 353.15 K and at atmospheric pressure to evaluate the impact of the cation's aromaticity upon the thermophysical properties of ionic liquids. The properties investigated show that the pyridinium aromatic ring, with its pi-pi interactions, leads to a more rigid, compact and organized liquid phase, while the less rigid structure of the piperidinium cation induces more entanglement and consequently higher resistance to shear stress (higher viscosities) and better surface arrangement (higher surface tensions). The group contribution methods proposed by Gardas and Coutinho were also evaluated and fitted to the experimental data, allowing the proposal of new parameters for the cations investigated. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0378-3812
year published 2014
volume 375
beginning page 80
ending page 88
digital object identifier (doi) 10.1016/j.fluid.2014.04.029
web of science category Thermodynamics; Chemistry, Physical; Engineering, Chemical
subject category Thermodynamics; Chemistry; Engineering
unique article identifier WOS:000339533200010
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journal impact factor 2.838
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