fig4

Figure 4. (A) 3D extended network structure of OCF-20 with cubic symmetry^[52]. Copyright 2010, American Chemical Society; (B) Schematic illustration of the synthesis of OCF-21 through the coordination bond^[53]. Copyright 2017, Wiley-VCH; (C) Schematic illustration of the synthesis of OCF-22 through the coordination bond^[56]. Copyright 2018, American Chemical Society; (D) 2D layered structure of OCF-23^[57]. Copyright 2022, American Chemical Society. OCF: Organic cage-based framework.