Thermophysical properties of sulfonium- and ammonium-based ionic liquids

Abstract

Experimental data for the density, viscosity, refractive index and surface tension of four sulfonium-and ammonium-based Ionic Liquids (ILs) with the common bis (trifluoromethylsulfonyl) . Based on the gathered results and on data taken from literature, the impact of the cation isomerism and of the size of the aliphatic tails, as well as the effect resulting from the substitution of a nitrogen by a sulfur atom as the cation central atom, on the thermophysical properties of sulfonium-and ammonium-based ILs is here discussed. Remarkably, more symmetric cations present a lower viscosity for the same, and sometimes even for higher, alkyl chain lengths at the cation. Additional derivative properties, such as the isobaric thermal expansion coefficient, the surface thermodynamic properties and the critical temperature for the investigated ILs were also estimated and are presented and discussed.

Mutual solubilities between water and non-aromatic sulfonium-, ammonium- and phosphonium-hydrophobic ionic liquids

“…28 The V m of each IL at 298.15 K was determined based on the experimental density data taken from the literature. [37][38][39] As shown in Fig. 4, the sulfonium-based ILs fall close to the correlation previously presented for a wide range of [NTf 2 ]-based ILs.…”

Ionic Liquids Containing Sulfonium Cations as Electrolytes for Electrochemical Double Layer Capacitors

“…The densities follow a linear dependence with temperature over the range studied and is seen to decrease with increasing cation size; the values found are in good agreement with the literature. 36 Figure S 1).…”

Wettability and corrosion of [NTf2] anion-based ionic liquids on steel and PVD (TiN, CrN, ZrN) coatings

“…Coutinho et al [20,[24][25][26][27][28][29][30][31][32] found that surface tension in a couple of imidazolium-based IL series decreases with an increase in the cation side alkyl chain length up to hexyl and thus defined the CACL (critical alkyl chain length). On the other hand, surface tension remained almost constant for ILs with aliphatic moieties longer than the obtained CACL.…”