Ordered two-dimensional covalent organic frameworks (COFs) have generally been synthesized using reversible reactions. It has been difficult to synthesize a similar degree of ordered COFs using irreversible reactions. Developing COFs with a fused aromatic ring system via an irreversible reaction is highly desirable but has remained a significant challenge. Here we demonstrate a COF that can be synthesized from organic building blocks via irreversible condensation (aromatization). The as-synthesized robust fused aromatic COF (F-COF) exhibits high crystallinity. Its lattice structure is characterized by scanning tunneling microscopy and X-ray diffraction pattern. Because of its fused aromatic ring system, the F-COF structure possesses high physiochemical stability, due to the absence of hydrolysable weak covalent bonds.

通常使用可逆反应合成有序二维共价有机骨架 (COF)。使用不可逆反应很难合成类似程度的有序 COF。通过不可逆反应开发具有稠合芳环系统的 COF 是非常可取的，但仍然是一个重大挑战。在这里，我们展示了一种 COF，它可以通过不可逆缩合（芳构化）由有机结构单元合成。合成后的坚固稠芳烃 COF (F-COF) 具有高结晶度。其晶格结构通过扫描隧道显微镜和X射线衍射图进行表征。由于其稠合芳环系统，F-COF结构由于不存在可水解的弱共价键而具有高物理化学稳定性。