A supramolecular receptor for short‐chain perfluoroalkyl carboxylates was developed. The receptor displays a cage‐like geometry, with a defined binding site for the carboxylate head groups and an opening for the perfluoroalkyl side chains. The anionic guests are bound via multiple C–H···O hydrogen bonds, as revealed by the crystallographic analysis of an adduct between the receptor and trifluoroacetate. The receptor can be used for the selective extraction of perfluoroalkyl carboxylates from buffered aqueous solutions containing fluoride, chloride, nitrate, carbonate, acetate, and phosphate.

中文翻译：

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超分子受体选择性识别和提取短链全氟烷基羧酸盐


开发了一种短链全氟烷基羧酸盐的超分子受体。受体呈笼状几何形状，具有明确的羧酸盐头部基团结合位点和全氟烷基侧链的开口。阴离子客体通过多个 C–H···O 氢键，如受体和三氟乙酸酯之间加合物的晶体学分析所揭示的那样。该受体可用于从含有氟化物、氯化物、硝酸盐、碳酸盐、乙酸盐和磷酸盐的缓冲水溶液中选择性提取全氟烷基羧酸盐。