Covalent organic frameworks (COFs) are an emerging class of highly ordered porous polymers with many potential applications. They are currently designed and synthesized through hexagonal and tetragonal topologies, limiting the access to and exploration of new structures and properties. Here, we report that a triangular topology can be developed for the rational design and synthesis of a new class of COFs. The triangular topology features small pore sizes down to 12 Å, which is among the smallest pores for COFs reported to date, and high π-column densities of up to 0.25 nm(-2), which exceeds those of supramolecular columnar π-arrays and other COF materials. These crystalline COFs facilitate π-cloud delocalization and are highly conductive, with a hole mobility that is among the highest reported for COFs and polygraphitic ensembles.

中文翻译：

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具有三角形拓扑结构的结晶超微孔共价有机骨架的合理设计。

共价有机骨架（COF）是一类新兴的高度有序的多孔聚合物，具有许多潜在应用。目前，它们是通过六边形和四边形拓扑结构设计和合成的，从而限制了对新结构和新属性的访问和探索。在这里，我们报告可以开发出三角形拓扑结构，以合理设计和合成一类新型的COF。三角形拓扑结构的特征是孔径小至12Å，是迄今为止报道的COF的最小孔径，并且π柱密度高达0.25 nm（-2），超过了超分子柱状π阵列和其他COF材料。这些晶体COF促进了π云离域，并且具有很高的导电性，其空穴迁移率是报告的COF和多形合奏中最高的。