caa a22 4500 467920133 CHVBK 20180406152914.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s00706-006-0503-3 doi (NATIONALLICENCE)springer-10.1007/s00706-006-0503-3 Crown Ethers as Synergist in the 2-Thenoyltrifluoroacetone Extraction of Lanthanoids in 1,2-Dichloroethane [Elektronische Daten] [Gene Frederick Gagabe, Yuta Satoh, Keiichi Satoh, Kiyoshi Sawada] 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. Springer-Verlag, 2006 Keywords. Adduct formation constant nationallicence Crown ethers nationallicence ICP-MS nationallicence Lanthanoids nationallicence Synergistic extraction nationallicence Gagabe Gene Frederick Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan aut Satoh Yuta Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan aut Satoh Keiichi Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan aut Sawada Kiyoshi Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan aut Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/8(2006-08-01), 1015-1025 0026-9247 137:8<1015 2006 137 706 https://doi.org/10.1007/s00706-006-0503-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00706-006-0503-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gagabe Gene Frederick Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan aut NATIONALLICENCE 700 1- Satoh Yuta Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan aut NATIONALLICENCE 700 1- Satoh Keiichi Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan aut NATIONALLICENCE 700 1- Sawada Kiyoshi Department of Chemistry, Faculty of Science, Niigata University, Ikarashi 2-cho, Niigata, Japan aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/8(2006-08-01), 1015-1025 0026-9247 137:8<1015 2006 137 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer