caa a22 4500 469110996 CHVBK 20180323133111.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF02047440 doi (NATIONALLICENCE)springer-10.1007/BF02047440 Novel enhancement effect of a proton donor on chelate extraction: Extraction of iron(III) with acetylacetone and 3,5-dichlorophenol [Elektronische Daten] [S. Katsuta, H. Imura, N. Suzuki] Effect of 3,5-dichlorophenol (DCP) on the extraction of Fe(III) with acetylacetone (Hacac) in nonpolar organic solvents has been studied. It is found that a mixture of Hacac and DCP in heptane gives much higher extraction of Fe(III) than Hacac alone. Such novel enhancement effect is ascribable to the association of tris(acetylacetonato)iron(III) [Fe(acac)3] with DCP in the organic phase by hydrogen bonding. Association of Hacac with DCP has also been investigated and the intrinsic extraction equilibrium of Fe(III) is analyzed by using the equilibrium concentration of free Hacac and DCP. The association complexes are found to be Fe(acac)3 · n DCP (n=1, 2, 3) in heptane, and the overall association constants (βass, n) are determined to be log βass, 1 = 3.41, log βass, 2, = 5.97 and log βass, 3, = 7.50. Akadémiai Kiadó, 1992 Katsuta S. Department of Chemistry, Faculty of Science, Tohoku University, 980, Sendai, Japan aut Imura H. Department of Chemistry, Faculty of Science, Tohoku University, 980, Sendai, Japan aut Suzuki N. Department of Chemistry, Faculty of Science, Tohoku University, 980, Sendai, Japan aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 157/2(1992-03-01), 255-264 0236-5731 157:2<255 1992 157 10967 https://doi.org/10.1007/BF02047440 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02047440 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Katsuta S. Department of Chemistry, Faculty of Science, Tohoku University, 980, Sendai, Japan aut NATIONALLICENCE 700 1- Imura H. Department of Chemistry, Faculty of Science, Tohoku University, 980, Sendai, Japan aut NATIONALLICENCE 700 1- Suzuki N. Department of Chemistry, Faculty of Science, Tohoku University, 980, Sendai, Japan aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 157/2(1992-03-01), 255-264 0236-5731 157:2<255 1992 157 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer