Solvent extraction of perrhenate ions with podand-type nitrogen donor ligands
Solvent extraction of perrhenate ions with podand-type nitrogen donor ligands
复制标题
DOI：
10.1016/j.seppur.2009.05.016
复制
发表时间：
2009-08
影响因子：
8.6
通讯作者：
Takeshi Ogata;K. Takeshita;K. Tsuda;A. Mori
中科院分区：
文献类型：
--
作者：
Takeshi Ogata;K. Takeshita;K. Tsuda;A. Mori
研究了豆荚型氮给体N，N,N′，N′-四akis（2-吡啶基甲基）-1,2-乙二胺（TPEN）及其类似物对过苯酚离子（ReO4−）的萃取作用。对于TPEN萃取ReO4−，在pheq3.5以上范围内，Re的分布比随着水溶液酸度的增加而增加，在pheq3.5以下范围内，Re的分布比减小。结果表明，在酸性较低的溶液中，质子化的TPEN萃取了ReO4−；而多质子化TPEN在强酸性溶液中的溶解度增加，减少了ReO4−的萃取。为了抑制TPEN在酸性溶液中的溶解，合成了两种疏水性TPEN类似物：N，N,N′，N′-四基（2-吡啶基甲基）-二丁乙二胺（TPDBEN）和N，N,N′，N′-四基[4-（2-丁氧基）-2-吡啶基甲基]乙二胺（TBPEN）。疏水TPEN类似物的Re分布比即使在pheq3.5以下也随着水溶液酸度的增加而增加，并且在pHeq2左右比TPEN的Re分布比高出两个数量级。
The extraction of perrhenate ion (ReO4−) with a podand-type nitrogen donor ligand, N,N,N’,N’-tetrakis(2-pyridylmethyl)-1,2-ethylenediamine (TPEN), and its analogs were investigated. For the extraction of ReO4−with TPEN, the distribution ratio of Re increased with increasing the acidity of the aqueous solution in the pHeqrange above 3.5 and decreased in the pHeqrange below 3.5. These results indicate that ReO4−is extracted with protonated TPEN in the lower acidic solution; but the extraction of ReO4−is reduced by the increase in the solubility of multi-protonated TPEN into the highly acidic solution. Two hydrophobic TPEN analogs introducing alkyl groups, N,N,N’,N’-tetrakis(2-pyridylmethyl)-dibutylethylenediamine (TPDBEN) and N,N,N’,N’-tetrakis[4-(2-butyloxy)-2-pyridylmethyl] ethylenediamine (TBPEN), were synthesized in order to suppress the dissolution of TPEN into acidic solution. The distribution ratios of Re for hydrophobic TPEN analogs increased with increasing the acidity of the aqueous solution even in the pHeqrange below 3.5 and achieved two order of magnitude higher than that for TPEN at about pHeq2.