Selective Extraction of Lithium with a Macrocyclic Trinuclear Complex of (1,3,5-Trimethylbenzene)ruthenium(II) Bridged by 2,3-Dioxopyridine
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A macrocyclic trinuclear complex of (1,3,5-trimethylbenzene)ruthenium(II) bridged by 2,3-dioxopyridine was synthesized, and the extraction properties for lithium and sodium picrates were investigated in a dichloromethane/water system at 25°C. The complex was found to have extremely high extractability and selectivity for lithium picrate; the logarithmic values of the extraction constants are 5.86 and 2.63 for Li<sup>+</sup> and Na<sup>+</sup>, respectively. By using this complex as an extractant, nearly quantitative extraction and separation of Li<sup>+</sup> from Na<sup>+</sup> could be achieved by a single extraction.
- Analytical Sciences
Analytical Sciences 24(10), 1215-1217, 2008-10-10
The Japan Society for Analytical Chemistry