Robust assembly of aromatic molecules Organic materials can exhibit high porosity, but the structures often collapse or decompose at high temperatures. Yamagishi et al. synthesized an aromatic molecule that bears a symmetrical outer shell of three dipyridylphenyl wedges and crystallized it from highly dielectric solvents. Porous crystals formed with complex pore-wall structures that resulted from labile C–H⋯N bonds and van der Waals forces. Despite the weakness of these interactions, the porous structure was stable up to 202°C and could be recovered after collapse by exposure to solvent vapor. Science, this issue p. 1242 An aromatic core-shell molecule forms thermally stable, structurally complex porous crystals in highly dielectric solvents. Here we report an anomalous porous molecular crystal built of C–H···N-bonded double-layered roof-floor components and wall components of a segregatively interdigitated architecture. This complicated porous structure consists of only one type of fully aromatic multijoint molecule carrying three identical dipyridylphenyl wedges. Despite its high symmetry, this molecule accomplishes difficult tasks by using two of its three wedges for roof-floor formation and using its other wedge for wall formation. Although a C–H···N bond is extremely labile, the porous crystal maintains its porosity until thermal breakdown of the C–H···N bonds at 202°C occurs, affording a nonporous polymorph. Though this nonporous crystal survives even at 325°C, it can retrieve the parent porosity under acetonitrile vapor. These findings show how one can translate simplicity into ultrahigh complexity.

中文翻译：

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从几何简单的分子自组装具有高结构复杂性的晶格

芳香族分子的稳健组装 有机材料可以表现出高孔隙率，但其结构经常在高温下坍塌或分解。山岸等人。合成了一个芳香分子，它带有三个二吡啶基苯基楔形的对称外壳，并从高介电溶剂中结晶出来。由不稳定的 C–H⋯N 键和范德华力形成的具有复杂孔壁结构的多孔晶体。尽管这些相互作用很弱，但多孔结构在高达 202°C 时仍是稳定的，并且可以在暴露于溶剂蒸汽中坍塌后恢复。科学，这个问题 p。1242 芳香族核壳分子在高介电性溶剂中形成热稳定、结构复杂的多孔晶体。在这里，我们报告了一种异常多孔分子晶体，由 C–H···N 键合的双层屋顶地板组件和隔离交叉结构的墙组件构成。这种复杂的多孔结构仅由一种带有三个相同的二吡啶基苯基楔形物的全芳香多关节分子组成。尽管具有高度对称性，但该分子通过使用其三个楔形中的两个用于屋顶地板形成并使用其另一个楔形用于墙壁形成来完成艰巨的任务。尽管 C–H…N 键极不稳定，但多孔晶体保持其孔隙率，直到 C–H…N 键在 202°C 发生热分解，提供无孔多晶型物。尽管这种无孔晶体即使在 325°C 下也能存活，但它可以在乙腈蒸气下恢复母体孔隙度。