An Upgraded “Two‐in‐One” Strategy toward Highly Crystalline Covalent Organic Frameworks

Abstract

A highly crystalline bicarbazole‐based covalent organic framework (BCzP‐COF) was synthesized via an upgraded “two‐in‐one” strategy by the self‐polycondensation of A 2 B 2 mononer with two neopentyl acetal and two amine groups. Such strategy is propitious to afford higher crystallinity, larger special surface areas and better morphology than that of using unprotected monomer with free aldehydes and amines. Additionally, the off‐white powder of BCzP‐COF could serve as acidichromism sensor with a significant color change. Intriguingly, the conductivity of the protonated BCzP‐COF can improve six orders of magnitude compared to that of the pristine samples. This work opens new potentials for bicarbazole‐functional materials toward chemosensors and electronic devices.