Structural and Positional Isomerism Influence in the Physical Properties of Pyridinium NTf2-Based Ionic Liquids: Pure and Water-Saturated Mixtures
authors Oliveira, FS; Freire, MC; Carvalho, PI; Coutinho, JAP; Lopes, JNC; Rebelo, LPN; Marrucho, IM
nationality International
journal JOURNAL OF CHEMICAL AND ENGINEERING DATA
keywords THERMODYNAMIC PROPERTIES; MUTUAL SOLUBILITIES; HEAT-CAPACITIES; BINARY-MIXTURES; TEMPERATURE; DENSITIES; VISCOSITY; SOLVENTS; UNIQUE
abstract Density and viscosity data for six pyridinium-based ionic liquids combined with the bis[(trifluoromethyl)-sulfonyl]amide anion were measured at atmospheric pressure in the (278 to 363) K temperature range. The fundamental aim of this work is to study the effect or the structure of the pyridinium-based cation, namely, its alkyl chain length and structural isomers, and the position of the second alkyl substitution on the measured properties. Albeit many studies exist on the physical properties of ionic liquids in what concerns the nature of the anion and the length of the cation alkyl side chain, the effect of structural and positional isomerism on those properties is much less known. In addition-and since small amounts of water influence the phase equilibrium and thermophysical properties of ionic liquids-water-saturated ionic liquid samples were also studied in the (298 to 363) K temperature range. The Vogel-Tammann-Fulcher (VTF) method was applied to describe the viscosity data, and novel group contribution parameters are proposed for the ionic liquid cations presented here, thus broadening its applicability.
publisher AMER CHEMICAL SOC
issn 0021-9568
year published 2010
volume 55
issue 10
beginning page 4514
ending page 4520
digital object identifier (doi) 10.1021/je100377k
web of science category Thermodynamics; Chemistry, Multidisciplinary; Engineering, Chemical
subject category Thermodynamics; Chemistry; Engineering
unique article identifier WOS:000282848400061
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journal impact factor 2.196
5 year journal impact factor 2.331
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