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首页> 外文期刊>Chemistry: A European journal >Aqueous Sulfate Separation by Sequestration of [(SO4)(2)(H2O)(4)](4-) Clusters within Highly Insoluble Imine-Linked Bis-Guanidinium Crystals
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Aqueous Sulfate Separation by Sequestration of [(SO4)(2)(H2O)(4)](4-) Clusters within Highly Insoluble Imine-Linked Bis-Guanidinium Crystals

机译：螯合[（SO4）（2）（H2O）（4）]（4-）团簇在高度不溶的亚胺连接双胍基晶体中的硫酸水分离

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摘要

Selective crystallization of sulfate with a simple bis-guanidinium ligand, self-assembled in situ from terephthalaldehyde and aminoguanidinium chloride, was employed as an effective way to separate the highly hydrophilic sulfate anion from aqueous solutions. The resulting bis-iminoguanidinium sulfate salt has exceptionally low aqueous solubility (K-sp=2.4x10(-10)), comparable to that of BaSO4. Single-crystal X-ray diffraction analysis showed the sulfate anions are sequestered as [(SO4)(2)(H2O)(4)](4-) clusters within the crystals. Variable-temperature solubility measurements indicated the sulfate crystallization is slightly endothermic (H-cryst=3.7kJmol(-1)), thus entropy driven. The real-world utility of this crystallization-based approach for sulfate separation was demonstrated by removing up to 99% of sulfate from seawater in a single step.
机译：具有简单的双胍盐配体的硫酸盐的选择性结晶，是从对苯二醛和氯化氨基胍中原位自组装的，它是从水溶液中分离高亲水性硫酸盐阴离子的有效方法。所得双亚氨基硫酸胍盐具有极低的水溶性（K-sp = 2.4x10（-10）），与BaSO4相当。 X射线单晶衍射分析表明，硫酸根阴离子被螯合为晶体中的[（SO4）（2）（H2O）（4）]（4-）簇。可变温度溶解度测量结果表明，硫酸盐结晶略有吸热（H-cryst = 3.7kJmol（-1）），因此受熵驱动。通过一步分离从海水中去除高达99％的硫酸盐，证明了这种基于结晶的方法用于硫酸盐分离的实际用途。

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