Covalent organic nanosheets (CONs) have emerged as functional two-dimensional
materials for versatile applications. Although π–π stacking between layers, hydrolytic
instability, possible restacking prevents their exfoliation on to few thin layered CONs from
crystalline porous polymers. We anticipated rational designing of a structure by intrinsic ionic
linker could be the solution to produce self-exfoliated CONs without external stimuli. In an
attempt to address this issue, we have synthesized three self-exfoliated guanidinium halide …