Coordination cages as permanently porous ionic liquids
Coordination cages as permanently porous ionic liquids
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DOI：
10.1038/s41557-020-0419-2
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发表时间：
2020-02-10
期刊：
影响因子：
21.8
通讯作者：
Nitschke, Jonathan R.
中科院分区：
文献类型：
--
作者：
Ma, Lillian;Haynes, Cally J. E.;Nitschke, Jonathan R.
多孔材料广泛用于工业应用，包括化学分离和气体洗涤。这些材料通常是多孔固体，尽管在工业环境中液态更容易操作。将多孔畴的尺寸和形状选择性与液体的流动性相结合是一种很有前途的方法，由功能化有机笼组成的多孔液体近年来受到了人们的关注。这里我们描述了一个离子-液体，多孔，四面体配位笼。补充在其他多孔液体中观察到的气体结合，这种材料也封装了非气体客体-观察到一系列异构醇的形状和尺寸选择性。三种气态氯氟化碳客体，三氯氟甲烷、二氯二氟甲烷和三氟氯甲烷，也被液体配位笼吸收，其亲和力随其大小而增加。我们希望这些发现将导致其他多孔液体的合成，这些液体的客吸收特性可能被定制以实现特定的功能。多孔液体有望将固体多孔性的优点与液体流动性的优点结合起来。现在，一个永久多孔离子-液体配位笼已经组装好，它封装了具有一定尺寸和形状选择性的丁醇和丙醇异构体，以及三种具有大小依赖亲和力的气态氯氟烃。
Porous materials are widely used in industry for applications that include chemical separations and gas scrubbing. These materials are typically porous solids, although the liquid state can be easier to manipulate in industrial settings. The idea of combining the size and shape selectivity of porous domains with the fluidity of liquids is a promising one and porous liquids composed of functionalized organic cages have recently attracted attention. Here we describe an ionic-liquid, porous, tetrahedral coordination cage. Complementing the gas binding observed in other porous liquids, this material also encapsulates non-gaseous guests-shape and size selectivity was observed for a series of isomeric alcohols. Three gaseous chlorofluorocarbon guests, trichlorofluoromethane, dichlorodifluoromethane and chlorotrifluoromethane, were also shown to be taken up by the liquid coordination cage with an affinity that increased with their size. We hope that these findings will lead to the synthesis of other porous liquids whose guest-uptake properties may be tailored to fulfil specific functions.Porous liquids promise to combine the advantages of the porosity of solids with those of the fluidity of liquids. Now, a permanently porous ionic-liquid coordination cage has been assembled that encapsulates isomers of butanol and propanol with some size and shape selectivity, as well as three gaseous chlorofluorocarbons with a size-dependent affinity.