Separation of 2-Chloropyridine/3-Chloropyridine by Nonporous Adaptive Crystals of Pillararenes with Different Substituents and Cavity Sizes,Journal of the American Chemical Society

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Separation of 2-Chloropyridine/3-Chloropyridine by Nonporous Adaptive Crystals of Pillararenes with Different Substituents and Cavity Sizes
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-03-05 , DOI: 10.1021/jacs.0c01274
Xinru Sheng ₁ , Errui Li ₁ , Yujuan Zhou ₁ , Run Zhao ₁ , Weijie Zhu ₁ , Feihe Huang ₁

Affiliation

Two monochloropyridine isomers, 2-chloropyridine (2-CP) and 3-chloropyridine (3-CP), are in need of a more effective separation method besides rectification. Herein we offer a facile and energy-saving adsorptive separation way using nonporous adaptive crystals of perethylated pillar[5]arene (EtP5), perethylated pillar[6]arene (EtP6), perbromoethylated pillar[5]arene (BrP5) and perbromoethylated pillar[6]arene (BrP6), which possess different cavity sizes and substituents and have never been employed in the separation of single-substituted heterocyclic aromatic compounds. BrP6 crystals show a marked preference for 2-CP in the equimolar mixture of 2-CP and 3-CP, affording it with 96.4% purity. Single crystal diffraction experiments demonstrate that BrP6 has stronger host-guest interactions with 2-CP than 3-CP. The cycling experiments demonstrate that BrP6 crystals can be used at least five times without losing their adsorption selectivity or capacity.

中文翻译：

不同取代基和腔尺寸的柱芳烃无孔自适应晶体分离2-氯吡啶/3-氯吡啶

两种单氯吡啶异构体，2-氯吡啶 (2-CP) 和 3-氯吡啶 (3-CP)，除了精馏外，还需要更有效的分离方法。在此，我们利用全乙基化柱[5]芳烃（EtP5）、全乙基化柱[6]芳烃（EtP6）、全溴乙基化柱[5]芳烃（BrP5）和全溴乙基化柱[5]芳烃的无孔自适应晶体提供了一种简便、节能的吸附分离方法。 6]芳烃（BrP6），其具有不同的腔尺寸和取代基，从未用于分离单取代的杂环芳族化合物。BrP6 晶体在 2-CP 和 3-CP 的等摩尔混合物中显示出对 2-CP 的明显偏好，使其纯度为 96.4%。单晶衍射实验表明 BrP6 与 2-CP 的主客体相互作用比 3-CP 更强。

更新日期：2020-03-05

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