Crown Ethers as Synergist in the 2-Thenoyltrifluoroacetone Extraction of Lanthanoids in 1,2-Dichloroethane |
| |
| Authors: | Gene Frederick Gagabe Yuta Satoh Keiichi Satoh Kiyoshi Sawada |
| |
| Institution: | (1) Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan |
| |
| Abstract: | Summary. The solvent extraction of 14 trivalent lanthanoid ions (Ln
3+) from a nitrate medium into 1,2-dichloroethane containing 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (HTTA) was investigated at 25.0°C. The extraction of Ln(TTA)3 species was confirmed and the extraction constants were determined. The extraction of Ln with the synergistic mixture of HTTA and a crown ether (CE: 12-crown-4, 18-crown-6, cyclohexano-18-crown-6 or benzo-18-crown-6) was also investigated at 25.0°C. The 1:1 adducts of
the complex and crown ether, Ln(TTA)3·(CE) are formed for all the lanthanoid ions and the CEs used in this study. The formation constants, βadd, of the adduct Ln(TTA)3·(CE) from Ln(TTA)3 in the organic phase were determined by nonlinear least-squares method. The stabilities and structures of the formed adducts
were discussed with respect to the cavity size, steric effect, and basicity of the CE. |
| |
| Keywords: | , Adduct formation constant, Crown ethers, ICP-MS, Lanthanoids, Synergistic extraction, |
| 本文献已被 SpringerLink 等数据库收录！ |
|
