Halogen-Free Water-Immiscible Ionic Liquids Based on Tetraoctylammonium Cation and Dodecylsulfate and Dodecylbenzenesulfonate Anions, and Their Application as Chelate Extraction Solvent

• DOI: 10.2116/analsci.22.199
• Publication Date: 2006-03-24T05:59:06Z
• Authors: Toshihide Tsukatani; Hajime Katano; Hirosuke Tatsumi; Mika Deguchi; Naoki Hirayama
• Keywords: Anions; Ions; Benzenesulfonates; Temperature; Water; Hydrogen-Ion Concentration; 01 natural sciences; 6. Clean water; 0104 chemical sciences; Quaternary Ammonium Compounds; Halogens; Alkanesulfonic Acids; Solubility; Metals; Cations; Solvents; Chelating Agents

The tetraoctylammonium cation forms water-immiscible room temperature ionic liquids with dodecylsulfate and dodecylbenzenesulfonate anions. The ionic liquids are halogen-free and can be considered environmentally friendly solvents. At 25 degrees C, the solubilities of water in tetraoctylammonium dodecylsulfate and tetraoctylammonium dodecylbenzenesulfonate were 2.8 and 4.0%, respectively, and the densities were 0.92 and 0.93 g cm(-3). The ionic liquids formed stable interfaces with water at 25 degrees C. The possible use of tetraoctylammonium dodecylsulfate as chelate extraction solvent was evaluated by using 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione as extractant. Tetraoctylammonium dodecylsulfate showed high extraction performance for divalent transition metal cations.