Planeta Josef, Karásek Pavel, Roth Michal
Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic, Veveí U+0159 97, 60200 Brno, Czech Republic.
J Phys Chem B. 2007 Jul 5;111(26):7620-5. doi: 10.1021/jp071514o. Epub 2007 Jun 5.
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 (scCO2) system were obtained by capillary column chromatography with [thtdp][Cl] as the stationary liquid and scCO2 as the carrier fluid. It is shown that supercritical fluid chromatography can be used to probe the partitioning behavior of solutes in biphasic IL-scCO2 systems even when the IL has nonzero solubility in scCO2. 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]-scCO2 system, the solute partition coefficients in the [thtdp][Cl]-scCO2 system are more sensitive to the solute hydrogen bond acidity descriptor.
以三己基十四烷基氯化鏻（[thtdp][Cl]）离子液体（IL）-超临界二氧化碳（scCO₂）体系为研究对象，通过毛细管柱色谱法，以[thtdp][Cl]为固定液、scCO₂为载气，获得了一系列低至中等挥发性溶质在两相之间的极限分配系数。结果表明，即使离子液体在超临界二氧化碳中有非零溶解度，超临界流体色谱法也可用于探究溶质在双相离子液体-超临界二氧化碳体系中的分配行为。在特定温度和二氧化碳密度下，溶质的相对分配系数可通过亚伯拉罕线性溶剂化能关系进行关联。与我们之前在[bmim][BF₄]-scCO₂体系中的结果相比，[thtdp][Cl]-scCO₂体系中溶质的分配系数对溶质氢键酸度描述符更为敏感。
