Revealing the contribution of π-π stacking interactions in supramolecular assembly is important for understanding the intrinsic nature of molecular assembly fundamentally. However, because they are much weaker than covalent bonds, π-π stacking interactions are usually ignored in the construction of porous materials. Obtaining stable porous materials that are only dependent on π-π stacking interactions, despite being very challenging, could address this concern. Here, we present a porous supramolecular framework (π-1) stabilized only by intermolecular π-π stacking interactions. π-1 shows good thermal and chemical stability not only in various organic solvents but also in aqueous solution in a broad pH range. Furthermore, featuring one-dimensional channels with dangling thiolate groups, π-1 exhibits excellent Hg2+ removal performance, with adsorption capacity as high as 786.67 mg g-1 and an adsorption ratio as high as 99.998%. In addition, π-1 also shows high adsorption selectivity to Hg2+ in the presence of a series of interfering ions.

中文翻译：

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π-π堆积相互作用：稳定多孔超分子框架的不可忽略的力。


揭示超分子组装中π-π堆积相互作用的贡献对于从根本上理解分子组装的内在本质非常重要。然而，由于它们比共价键弱得多，π-π堆积相互作用在多孔材料的构造中通常被忽略。尽管非常具有挑战性，但获得仅依赖于 π-π 堆积相互作用的稳定多孔材料可以解决这个问题。在这里，我们提出了一种仅通过分子间 π-π 堆积相互作用稳定的多孔超分子框架 (π-1)。 π-1不仅在各种有机溶剂中而且在较宽pH范围的水溶液中都表现出良好的热稳定性和化学稳定性。此外，π-1具有带有悬挂硫醇基团的一维通道，具有优异的Hg2+去除性能，吸附容量高达786.67 mg g-1，吸附率高达99.998%。此外，在一系列干扰离子存在的情况下，π-1还表现出对Hg2+的高吸附选择性。