Liquid-liquid extraction of divalent transition metal ions with a novel bis-β-ketoester extraction reagent.
Liquid-liquid extraction of divalent transition metal ions with a novel bis-β-ketoester extraction reagent.
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使用新型双-β-酮酯萃取剂液-液萃取二价过渡金属离子。
DOI：
10.1016/j.talanta.2014.04.029
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H. Kokusen
中科院分区：
文献类型：
--
作者：
Satoshi Ohmuro;Hiromasa Kishi;N. Yoshihara;H. Kokusen
溶剂萃取法是分离金属离子的一种非常有效的方法。研究了N，N‘-双(2-羟基苯甲基)-N，N’-双(2-吡啶甲基)-1，2-乙二胺衍生物对金属离子的萃取性能。在本研究中，我们合成了一种双β-酮酯配体，并评价了其对二价过渡金属离子的选择性。以4，4，4-三氟乙酰乙酸乙酯和1，6-己二醇酯为原料，一步法合成了配体--正己烷-1，6-二(4，4，4-三氟-3-氧基丁酸)(H_2hdfob或H_2L)。多齿配体H_2hdfob成功地将二价过渡金属离子萃取到有机相中，其分配比logD与pH和对数[H_2L]呈线性关系，斜率分别约为+2和+1。在此基础上，提出了H_2hdfob的萃取机理。与其他双齿配体相比，四齿酸H_2hdfob萃取为提高二价金属离子的选择性提供了一种新的方法。
Solvent extraction is a very effective method for the separation of metal ions. N,N′-bis(2-hydroxy-phenylmethyl)-N,N′-bis(2-pyridylmetyl)-1,2-ethanediamine derivatives have been researched for solvent extraction of metal ions. In this study.We synthesized a bis-β-ketoester ligand and evaluated its selectivity in extracting divalent transition metal ions. The ligand, hexane-1,6-diyl bis (4,4,4-trifluoro-3-oxobutanoate) (H2hdfob or H2L) was synthesized in one step by transesterification of ethyl 4,4,4-trifluoroacetoacetate with 1,6-hexanediol. The multidentate ligand H2hdfob successfully extracted divalent transition metal ions into its organic phase.The relationship between logD, which is a distribution ratio (D), and pH or log[H2L]oexhibited linear relationships with slopes of approximately +2 and +1, respectively. Based on these results, we proposed a mechanism of extraction with H2hdfob. Extraction with tetradentate H2hdfob provides a new method for enhancing selectivity of divalent metal ions, in comparison to other bidentate ligands.