Hydrogen-bonded organic frameworks (HOFs) show great potential in many applications, but few structure-property correlations have been explored in this field. In this work, we report that self-assembly of a rigid and planar ligand gives rise to flat hexagonal honeycomb motifs which are extended into undulated two dimensional (2D) layers and finally generate three polycatenated HOFs with record complexity. This kind of undulation is absent in the 2D layers built from a very similar but non-planar ligand, indicating a slight torsion of ligand produces overwhelming structural change. This change delivers materials with unique stepwise adsorption behaviors under a certain pressure originating from the movement between mutually interwoven hexagonal networks. Meanwhile, high chemical stability, phase transformation, and preferential adsorption of aromatic compounds were observed in these HOFs. The results presented in this work would help us to understand the self-assembly behaviors of HOFs and shed light on the rational design of HOF materials for practical applications.

中文翻译：

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记录具有逐步吸附行为的三个多孔氢键有机骨架多链的复杂性

氢键有机骨架（HOF）在许多应用中显示出巨大的潜力，但在该领域很少探索结构-性能相关性。在这项工作中，我们报告了刚性和平面配体的自组装产生了扁平的六边形蜂窝图案，这些图案延伸到起伏的二维 (2D) 层，最终生成三个具有记录复杂性的多链 HOF。在由非常相似但非平面的配体构建的 2D 层中不存在这种波动，表明配体的轻微扭转会产生压倒性的结构变化。这种变化使材料在一定压力下具有独特的逐步吸附行为，这些压力源于相互交织的六边形网络之间的运动。同时，化学稳定性高，相变，在这些 HOF 中观察到芳香族化合物的优先吸附。这项工作中提出的结果将帮助我们了解 HOF 的自组装行为，并阐明 HOF 材料的实际应用的合理设计。