Pillar[5]arene-based phosphine oxides: novel ionophores for solvent extraction separation of f-block elements from acidic media

A new class of pillar[5]arene-based phosphine oxides tethered with ten chelating groups on both rims of the pillar were synthesized viatwo steps from macrocyclization of 1,4-bis(bromoalkoxy)benzenes with paraformaldehyde, followed by Arbusov reaction with iso-propoxydiphenylphosphine. Solvent extrac...

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Veröffentlicht in:RSC advances 2013-07, Vol.3 (30), p.12376-12383
Hauptverfasser: Fang, Yuyu, Wu, Lei, Liao, Jiali, Chen, Long, Yang, Yuanyou, Liu, Ning, He, Lutao, Zou, Shuliang, Feng, Wen, Yuan, Lihua
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container_end_page 12383
container_issue 30
container_start_page 12376
container_title RSC advances
container_volume 3
creator Fang, Yuyu
Wu, Lei
Liao, Jiali
Chen, Long
Yang, Yuanyou
Liu, Ning
He, Lutao
Zou, Shuliang
Feng, Wen
Yuan, Lihua
description A new class of pillar[5]arene-based phosphine oxides tethered with ten chelating groups on both rims of the pillar were synthesized viatwo steps from macrocyclization of 1,4-bis(bromoalkoxy)benzenes with paraformaldehyde, followed by Arbusov reaction with iso-propoxydiphenylphosphine. Solvent extraction of these ligands towards selected lanthanides and actinides was investigated under acidic condition. Compared with acyclic monovalent analogs and classical extractant tri-n-octylphosphine oxide (TOPO), the remarkable efficiency and selectivity for thorium(iv) and uranyl(vi) as observed in these novel extractants bearing a varying spacer length revealed the significance of preorganization of chelating groups on pillararene platform. Log-log plot analysis indicated the 1 : 1 stoichiometry (ligand/metal) for the extracted complex formed between the ligand and thorium(iv) or uranyl(vi). The extraction efficiency was considerably improved with increasing acidity in a range of 0.1-1.5 M HNO sub(3), a result that is distinct from the extraction behaviour of calixarene-based phosphine oxides. The extractability increased with enhancing NaNO sub(3) concentration and high salinity assisted the preferential extraction of U(vi) over Th(iv). These ligands also showed moderate efficiency in differentiating europium(iii) and americium(iii) at 1 M HNO sub(3) in the presence of a synergist (Br sub(6)-COSAN).
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source Royal Society Of Chemistry Journals 2008-
subjects Chelating
Lanthanides
Ligands
Nanomaterials
Nanostructure
Phosphine oxide
Solvent extraction
Spacers
title Pillar[5]arene-based phosphine oxides: novel ionophores for solvent extraction separation of f-block elements from acidic media
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