Limiting partition coefficients of solutes in biphasic trihexyltetradecylphosphonium chloride ionic liquid-supercritical CO2 system: Measurement and LSER-based correlation

作者：Planeta Josef; Karasek Pavel; Roth Michal^*

来源：Journal of Physical Chemistry B, 2007, 111(26): 7620-7625.

DOI：10.1021/jp071514o

Limiting partition coefficients of a selection of low-to-medium volatility solutes between both phases in a biphasic trihexyltetradecylphosphonium chloride ([thtdp][Cl]) ionic liquid (IL)-supercritical carbon dioxide (scCO(2)) system were obtained by capillary column chromatography with [thtdp][Cl] as the stationary liquid and scCO(2) as the carrier fluid. It is shown that supercritical fluid chromatography can be used to probe the partitioning behavior of solutes in biphasic IL-scCO(2) systems even when the IL has nonzero solubility in scCO(2). Relative partition coefficients of solutes at a particular temperature and density of CO2 can be correlated within Abraham's linear solvation energy relationships. Compared with our previous results in a [bmim][BF4]-scCO(2) system, the solute partition coefficients in the [thtdp][Cl]-scCO(2) system are more sensitive to the solute hydrogen bond acidity descriptor.

• 出版日期2007-7-5