fig2

Figure 2. TEM images for (A and B) ADTB-COF and (C and D) ADPB-COF; SEM images for (E) ADTB-COF and (F) ADPB-COF. TEM: Transmission electron microscopy; ADTB: (4-amino-4"-(2,2-dioxan-1,3-dioxan-5-yl)-[1,1':3',1"-terphenyl]-5'-yl) boronic acid; COF: covalent organic framework; ADPB: (4'-amino-5'-(4-(2,2-dioxan-1,3-dioxan-5-yl)phenyl)-[1,1':3',1'-teroxan]-5-yl) boronic acid; SEM: scanning electron microscopy.