Extraction spectrophotometry using a lithium-ion selective metallacrown: temperature effect on extraction reaction and application to determination of lithium in serum and seawater.

ABSTRACT: A metallacrown-type ionophore, 2,3-pyridinediolate-bridged (3,5-dimethylanisole)ruthenium trinuclear complex, has a high extraction selectivity for Li⁺, but the extraction reaction is very slow. To solve this problem, the effect of temperature on the rapidity and equilibrium of the extraction of Li⁺ and Na⁺ as picrates from water to toluene with the metallacrown was investigated in this study. While the extraction of Li⁺ requires 6 h of shaking for equilibration at 25 °C, the distribution ratio becomes nearly constant after 4 h and 2 h of shaking at 37 °C and 50 °C, respectively. The extraction equilibrium constants (K_ex) and associated thermodynamic parameters determined for Li⁺ and Na⁺ indicate that the extracti

SUBMITTER: Katsuta S 

PROVIDER: S-EPMC11208259 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature