Effective extraction of Pt(IV) as [PtCl6]2? from hydrochloric acid using a simple urea extractant
Effective extraction of Pt(IV) as [PtCl6]2? from hydrochloric acid using a simple urea extractant
复制标题
将 Pt(IV) 有效萃取为 [PtCl6]2？
DOI：
10.1016/j.seppur.2021.119456
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发表时间：
2021
影响因子：
8.6
通讯作者：
Ohto Keisuke
中科院分区：
文献类型：
--
作者：
Ueda Yuki;Morisada Shintaro;Kawakita Hidetaka;Wenzel Marco;Weigand Jan J.;Ohto Keisuke
制备了方便制备的 N,N'-二烷基取代脲衍生物 1-丁基-3-(2-乙基己基)脲 (L)，并阐明了其作为 HCl 溶液中 [PtCl6]2− 萃取剂的性能。L 有效地从 0.01 至 10 M HCl 溶液中萃取 Pt(IV) 和 Pd(II)，对金属离子 (Rh(III)、Rh(III)、 Ir(III)、Fe(III)、Cu(II)、Ni(II)、Co(II)、Zn(II) 和 Pb(II))，浓度范围为 0.3 至 1.0 M HCl 溶液。根据斜率分析，确定L对Pt(IV)的萃取平衡反应为[PtCl6]2−aq.+ 2Lorg.+ 2HClaq.↔(PtCl62−)·(HL+)2org.+ 2Cl−aq.，这是一个典型的离子对反应。紫外-可见光测量证明，Las [PtCl6]2−盐将 Pt(IV) 萃取到有机相中。195Pt 核磁共振 (NMR) 研究表明，与传统萃取剂三正辛胺从 HCl 溶液中萃取的 Pt(IV) 物质相比，L 萃取的 Pt(IV) 离子上的电子密度略低。红外和 1 H NMR 光谱测量揭示了有机相中 [PtCl6]2− 的 Cl− 配体和 Lin 的 N–H 质子之间存在强氢键。对 [PtCl6]2− 萃取前后有机相中的水含量进行分析表明，由于 [PtCl6]2− 通过 L 从水相萃取到有机相中，有 0.9–2.6 个水分子从有机相中释放出来。
The conveniently preparedN,N′-dialkylsubstituted urea derivative, 1-butyl-3-(2-ethylhexyl)urea (L), was prepared and elucidated with respect to its performance as an extractant for [PtCl6]2−from HCl solutions.Leffectively extracts Pt(IV) and Pd(II) from 0.01 to 10 M HCl solutions with a high selectively over metal ions (Rh(III), Ir(III), Fe(III), Cu(II), Ni(II), Co(II), Zn(II), and Pb(II)) in the concentration range from 0.3 to 1.0 M HCl solutions. According to a slope analysis, the extraction equilibrium reaction of Pt(IV) byLwas determined to be [PtCl6]2−aq.+ 2Lorg.+ 2HClaq.↔ (PtCl62−)·(HL+)2org.+ 2Cl−aq., which is a typical ion-pair reaction. Ultraviolet–visible measurements proved that Pt(IV) was extracted into the organic phase byLas a [PtCl6]2−salt.195Pt nuclear magnetic resonance (NMR) investigation suggests that the Pt(IV) extracted byLhas slightly lower electron density on the Pt(IV) ion compared with the Pt(IV) species extracted by the conventional extractant tri-n-octylamine from HCl solution. Infrared and1H NMR spectroscopic measurements revealed a strong hydrogen bonding between the Cl−ligands of [PtCl6]2−and the N–H protons ofLin the organic phase. Analysis of the water content in the organic phase, before and after the [PtCl6]2−extraction, shows that 0.9–2.6 water molecules are released from the organic phase as the result of [PtCl6]2−extraction from the aqueous into the organic phase byL.