Structural Effect of Sulfide-Containing Diamides on the Extraction of Palladium(II) from HCl

Structural Effect of Sulfide-Containing Diamides on the Extraction of Palladium(II) from HCl
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含硫化物二酰胺对盐酸萃取钯(II)的结构影响

DOI:
10.1080/07366299.2021.1876372
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发表时间:
2021
影响因子:
2
通讯作者:
Tanaka Mikiya
Tanaka Mikiya
中科院分区:
化学3区
文献类型:
--
作者:
Narita Hirokazu;Morisaku Kazuko;Tanaka Mikiya

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为了了解从盐酸溶液中萃取Pd(II)的化合物的结构与功能之间的关系,我们研究了三种含硫取代基的二胺-N,N-ʹ-二甲基-N,N-ʹ-二苯基:硫代二乙醇酰胺(MPTDGA)、3,3-ʹ-硫代二丙酰胺(MPTDPA)和1,2-乙烯-双(硫代乙醇酰胺)(MPEBTGA)对Pd(II)的萃取性能。从3.0M的HCl溶液中萃取Pd(II)的速度均远快于传统的硫化物萃取剂二正己基硫化物,且萃取率按mpebtga>mptdpa>mptdga的顺序递减。在有机相中萃取的Pd(II)−萃取剂络合物的表观化学计量比对MPETGA为1:1,对MPTDGA和MPTDPA分别为1:2。FT-IR测试表明,二胺中的酰胺氧原子并不直接与Pd(II)配位。这些结果表明,这三个二胺的主要配合物是[PdCl2(Mptdga)2]、[PdCl2(Mptdpa)2]和[PdCl2(Mpebtga)],硫化物与Pd(II)配位。
To understand the relationship between the structure and function of compounds for the extraction of Pd(II) from HCl solution, we investigated the Pd(II) extraction properties using three sulfide-containing diamides with the sameN-substituents,N,Nʹ-dimethyl-N,Nʹ-diphenyl: thiodiglycolamide (mptdga), 3,3ʹ-thiodipropionamide (mptdpa), and 1,2-ethylene-bis(thioglycolamide) (mpebtga) diluted in chloroform. All of the diamides extract Pd(II) from 3.0 M HCl solution much faster than the conventional sulfide extractant, di-n-hexyl sulfide, and the extraction efficiency decreases in the order mpebtga > mptdpa > mptdga. The apparent stoichiometry of the Pd(II)−extractant complex extracted in the organic phase is 1:1 for mpebtga and 1:2 for mptdga and mptdpa. The FT-IR measurements show that the amide oxygen atoms in the diamides do not directly coordinate to Pd(II). These results indicate that the dominant complexes for the three diamides are [PdCl2(mptdga)2], [PdCl2(mptdpa)2], and [PdCl2(mpebtga)] with the sulfide coordinating to Pd(II).
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