TY - JOUR
T1 - Extraction of Pd(ii) and Pt(ii) from aqueous hydrochloric acid with 1,3-diaminocalix[4]arene
T2 - switching of the extraction selectivity by using different extraction modes
AU - Morohashi, Naoya
AU - Kurusu, Yu
AU - Akasaka, Kosuke
AU - Hattori, Tetsutaro
N1 - Funding Information:
This work was supported in part by JSPS KAKENHI Grant Number 15K05466 and Iketani Science and Technology Foundation.
Publisher Copyright:
© The Royal Society of Chemistry 2020.
PY - 2020/9/28
Y1 - 2020/9/28
N2 - The extraction ability of 1,3-diaminocalix[4]arene (2: H2L) toward platinum group metals (PGMs) has been investigated, which revealed that2is able to extract Pd(ii) and Pt(ii) from hydrochloric acidviadifferent 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.
AB - The extraction ability of 1,3-diaminocalix[4]arene (2: H2L) toward platinum group metals (PGMs) has been investigated, which revealed that2is able to extract Pd(ii) and Pt(ii) from hydrochloric acidviadifferent 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.
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U2 - 10.1039/d0ra05339b
DO - 10.1039/d0ra05339b
M3 - Article
AN - SCOPUS:85092113461
SN - 2046-2069
VL - 10
SP - 35473
EP - 35479
JO - RSC Advances
JF - RSC Advances
IS - 58
ER -