Extraction of Pd(ii) and Pt(ii) from aqueous hydrochloric acid with 1,3-diaminocalix[4]arene: switching of the extraction selectivity by using different extraction modes.
Extraction of Pd(ii) and Pt(ii) from aqueous hydrochloric acid with 1,3-diaminocalix[4]arene: switching of the extraction selectivity by using different extraction modes.
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DOI：
10.1039/d0ra05339b
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发表时间：
2020-09-21
期刊：
影响因子：
3.9
通讯作者：
Hattori T
中科院分区：
文献类型：
--
作者：
Morohashi N;Kurusu Y;Akasaka K;Hattori T
研究了1，3-二氨基杯[4]芳烃(2：H_2L)对铂族金属(PGMS)的萃取性能，结果表明，2能够通过不同的萃取方式从盐酸中萃取Pd(II)和Pt(II)。平衡分析和X-射线晶体分析表明，Pd(II)和Pt(II)的萃取物种分别为[PdL]和[Pt2Cl6(H3L)2]。在[PdL]中，L2−的两个酚氧基和两个氨基与Pd离子配位。另一方面，在[Pt2Cl6(H3L)2]中，两个阴离子三氯络合物PtCl3−夹在两个H3L+之间，其中一个氨基直接配位到PtCl3−物种上，另一个质子化的氨基与另一个PtCl3−形成离子对。利用不同的萃取模式，通过改变水相中H+和Cl-−的浓度，实现了Pd(II)和Pt(II)竞争萃取的选择性切换。最后，从所提取的有机相中分别反萃钯(II)和铂(II)。1，3-二氮杂杯[4]芳烃对Pd(II)和Pt(II)具有一定的萃取能力，其选择性可以通过改变水相中H+和Cl-−的浓度来改变。
The extraction ability of 1,3-diaminocalix[4]arene (2: H2L) toward platinum group metals (PGMs) has been investigated, which revealed that 2 is able to extract Pd(ii) and Pt(ii) from hydrochloric acid via different extraction modes. The extraction species for Pd(ii) and Pt(ii) are [PdL] and [Pt2Cl6(H3L)2], respectively, as evidenced by equilibrium analysis and X-ray crystallography. In [PdL], the two phenoxide oxygens and two amino nitrogens of L2− coordinate to the Pd ion. On the other hand, in [Pt2Cl6(H3L)2], two anionic trichloro complexes PtCl3− are sandwiched between two H3L+, in which one amino nitrogen directly coordinates to a PtCl3− species and another protonated amino group forms an ion pair with another PtCl3−. Utilizing the different extraction modes, switching of the extraction selectivity has been achieved in the competitive extraction between Pd(ii) and Pt(ii) by varying the concentrations of H+ and Cl− in the aqueous phase. Finally, from the extracted organic phase, back-extraction of Pd(ii) and Pt(ii) was easily performed, respectively. 1,3-Diaminocalix[4]arene shows extraction ability toward Pd(ii) and Pt(ii), the selectivity of which can be switched by changing the concentrations of H+ and Cl− in the aqueous phase.
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影响因子：
6.1
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