Pillar[6]pyridinium: a hexagonally shaped molecular box that selectively recognizes multicharged anionic species
Pillar[6]pyridinium: a hexagonally shaped molecular box that selectively recognizes multicharged anionic species
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DOI：
10.1039/c8cc03353f
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发表时间：
2018-06-21
影响因子：
4.9
通讯作者：
Sashuk, Volodymyr
中科院分区：
文献类型：
--
作者：
Kosiorek, Sandra;Butkiewicz, Helena;Sashuk, Volodymyr
提出了一种具有特殊结构和前所未有的结合特性的六电荷环阳离子受体。大环由六个吡啶离子组成，由亚甲基连接体连接，内部有一个缺电子腔。在固体状态下，空腔被有组织的水网络填充，使大环呈六边形。在水中，腔体更灵活，可以选择性地容纳阴离子。在大小相似的离子中，负电荷最大的离子与大环结合最紧密。当净电荷相同时，带离域电荷的阴离子比带定域电荷的阴离子更受青睐；值得注意的是，前者形成包合物，而后者是外部络合物。
A sextuply charged cyclic cationic receptor with an extraordinary structure and unprecedented binding properties is presented. The macrocycle consists of six pyridinium ions connected by methylene linkers with an electron-deficient cavity inside. In the solid state, the cavity is padded with an organized water network that gives the macrocycle a hexagonal shape. In water, the cavity is more flexible and selectively accommodates anionic species. Of the ions of similar size the macrocycle binds most strongly those with the largest negative charge. When the net charge is the same, the most preferred are anions with delocalized charge rather that those with localized charge; remarkably, the former form inclusion complexes, while the latter are complexed externally.