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Issue 4, 2006
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Fluorine-free and hydrophobic room-temperature ionic liquids, tetraalkylammonium bis(2-ethylhexyl)sulfosuccinates, and their ionic liquidwater two-phase properties

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Abstract

Fluorine-free and hydrophobic room-temperature ionic liquids (RTILs) composed of the bis(2-ethylhexyl)sulfosuccinate (BEHSS) ion, which is known as the surface-active anion constituting Aerosol OT®, and symmetric tetraalkylammonium ions ((CnH2n+1)4N+; n = 4–8), have been prepared. Physicochemical properties of the water-saturated RTILs such as density, conductivity, viscosity and mutual solubility with water (W) have been measured. The RTIL|W interface is polarizable for the RTILs with n = 5–8 in spite of the high water content, 3.6–8.9 wt% in the water-saturated RTILs. The width of the polarized potential window of the RTIL|W interfaces is quantitatively correlated with the solubility of the RTIL in W. The RTIL–W two-phase systems are not spontaneously emulsified and no reverse micelles are formed in the water-saturated RTILs, although BEHSS is known to form stable water-in-oil emulsions and reverse micelles in oil–water two-phase systems.

Graphical abstract: Fluorine-free and hydrophobic room-temperature ionic liquids, tetraalkylammonium bis(2-ethylhexyl)sulfosuccinates, and their ionic liquid–water two-phase properties

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Publication details

The article was received on 12 Aug 2005, accepted on 11 Jan 2006 and first published on 30 Jan 2006


Article type: Paper
DOI: 10.1039/B511529A
Green Chem., 2006,8, 349-355

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    Fluorine-free and hydrophobic room-temperature ionic liquids, tetraalkylammonium bis(2-ethylhexyl)sulfosuccinates, and their ionic liquidwater two-phase properties

    N. Nishi, T. Kawakami, F. Shigematsu, M. Yamamoto and T. Kakiuchi, Green Chem., 2006, 8, 349
    DOI: 10.1039/B511529A

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