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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Lanthanide ion exchange properties of a coordination polymer consisting of di(2-ethylhexyl) phosphoric acid and trivalent metal ions (Ce~(~(3+)), Fe~(~(3+)), or Al~(~(3+)))
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Lanthanide ion exchange properties of a coordination polymer consisting of di(2-ethylhexyl) phosphoric acid and trivalent metal ions (Ce~(~(3+)), Fe~(~(3+)), or Al~(~(3+)))

机译：由二（2-乙基己基）磷酸和三价金属离子（Ce〜（〜（3 +）），Fe〜（〜（3+））或Al〜（〜（3）组成的配位聚合物的镧系元素离子交换性质+）））

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摘要

Three kinds of coordination polymers ([M(dehp)_3], M = Ce, Fe, or Al) were prepared by mixing the sodium form (Na(dehp)) of di(2-ethylhexyl) phosphoric acid and MCl_3 in an ethanol-water binary mixture. They have monoclinic crystalline structure with similar lattice parameters. The lanthanide ion (Ln~(3+) = La~(3+), Sm~(3+), Dy~(3+), or Yb~(3+)) exchange properties were studied in a 20: 80 vol% ethanol-water binary mixture containing 2 mM Ln(NO_3)_3 at room temperature. The rate of Ln~(3+) adsorption is relatively slow; it requires over 3 weeks to reach equilibrium. [M(dehp)_3] has different Ln~(3+) affinities depending on the kind of central metal ions: the affinity order at 3 week adsorption is Yb~(3+) < La~(3+) < Dy~(3+) < Sm~(3+) for [Ce(dehp)_3], La~(3+) < Sm~(3+) < Dy~(3+) < Yb~(3+) for [Fe(dehp)_3], and La~(3+) < Sm~(3+), Dy~(3+), Yb~(3+) for [Al(dehp)_3]. The difference in affinity order can be explained by two factors: the coordination preference and steric strain caused by the polymeric structure. The chemical and structural analyses suggested that the Ln~(3+) adsorption progresses first by the central M~(3+)/Ln~(3+) exchange, followed by a morphological change to a rod-like or fibrous form by a solid phase reaction. In the case of [Fe(dehp)_3], the eluted Fe~(3+) may be hydrolyzed and precipitated as amorphous iron hydroxide.
机译：通过在乙醇中混合二（2-乙基己基）磷酸的钠形式（Na（dehp））和MCl_3来制备三种配位聚合物（[M（dehp）_3]，M = Ce，Fe或Al） -水二元混合物。它们具有具有相似晶格参数的单斜晶体结构。以20:80的体积研究了镧系离子（Ln〜（3+）= La〜（3 +），Sm〜（3 +），Dy〜（3+）或Yb〜（3+））交换性能在室温下含有2 mM Ln（NO_3）_3的％乙醇-水二元混合物。 Ln〜（3+）的吸附速度相对较慢。它需要超过3周的时间才能达到平衡。 [M（dehp）_3]具有不同的Ln〜（3+）亲和力，具体取决于中心金属离子的种类：3周吸附时的亲和力顺序为Yb〜（3+）

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