Abstract
The stability constants of the [Cs(DB18C6)]+ complex (DB18C6 is dibenzo-18-crown-6, L) in hydrophobic ionic liquids (room-temperature ionic liquids, RTIL) trioctylmethylammonium salicylate ([TOMA][Sal]), tetrahexylammnoium dihexylsulfosuccinate ([THA][DHSS]), and 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([BMIM][N(Tf)2], as well as of the [Cs(18C6)2]+ complex in [BMIM][N(Tf)2], were measured by 133Cs NMR in the temperature range 27–57°C. The changes in the enthalpy and entropy of complex formation were determined. A linear correlation was revealed between logK 1 and the extraction factor logD Cs DB18C6 for the cesium extraction from an aqueous solution into the RTIL.
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