Two-dimensional amine and hydroxy functionalized fused aromatic covalent organic framework
Javeed Mahmood, Ishfaq Ahmad, Minbok Jung, Jeong‐Min Seo, Soo‐Young Yu, Hyuk‐Jun Noh, Young Hyun Kim, Hyung‐Joon Shin, Jong‐Beom Baek
Abstract
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.