Comparison of the Extractabilities of Tetrachloro- and Tetrabromopalladate(II) Ions with a Thiodiglycolamide Compound
Comparison of the Extractabilities of Tetrachloro- and Tetrabromopalladate(II) Ions with a Thiodiglycolamide Compound
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硫代二甘醇酰胺化合物对四氯和四溴钯 (II) 离子的萃取能力比较
DOI：
10.2116/analsci.33.1305
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发表时间：
2017
影响因子：
1.6
通讯作者：
T. Yaita
中科院分区：
文献类型：
--
作者：
H. Narita;Motoki Maeda;C. Tokoro;Tomoya Suzuki;Mikiya Tanaka;R. Motokawa;H. Shiwaku;T. Yaita
以N，N，N ′，N ′-四-（2-乙基己基）硫代二甘醇酰胺（TEHTDGA）的正十二烷溶液为萃取剂，比较了Pd（II）从HCl和HBr溶液中的萃取率，并分析了Pd（II）-萃取剂络合物的结构。为了比较，用二正己基硫醚（DHS）（一种众所周知的硫化物型萃取剂）进行类似的实验。TEHTDGA从HCl和HBr溶液中提取Pd（II）的速度比DHS快得多。有机相中的Pd（II）/（TEHTDGA或DHS）化学计量为1：2。对于TEHTDGA，Pd（II）从HBr溶液中的萃取性劣于从HCl溶液中的萃取性，而DHS则相反。然而，FT-IR光谱和EXAFS测量表明，内球结构的Pd（II）在TEHTDGA配合物中是几乎相同的DHS系统：在这两种情况下，两个卤素离子中的四氯或四溴钯（II）离子被替换的两个萃取剂分子的硫原子。
Using N , N , N′ , N′ -tetra-2-ethylhexyl-thiodiglycolamide (TEHTDGA) in n -dodecane as the extractant, we compared the percentages of Pd(II) extracted from HCl and HBr solutions, and analyzed the structures of the Pd(II)-extractant complexes. For comparison, similar experiments were performed with di- n -hexyl sulfide (DHS), a well-known sulfide-type extractant. TEHTDGA extracted Pd(II) from both HCl and HBr solutions much faster than DHS. The Pd(II)/(TEHTDGA or DHS) stoichiometry in the organic phase was 1:2. For TEHTDGA, the extractability of Pd(II) from HBr solution was inferior to that from HCl solution, whereas the opposite was true for DHS. However, FT-IR spectroscopy and EXAFS measurements indicated that the inner-sphere structure of Pd(II) in the TEHTDGA complex was almost the same as that in the DHS system: in both cases, two of the halide ions in the tetrachloro- or tetrabromopalladate(II) ion were replaced by the sulfur atoms of two extractant molecules.