“…In particular, NA-POS-1 possesses a moderate Brunauer–Emmett–Teller (BET) surface area of 61 m 2 g −1 and a total pore volume of 0.41 cm 3 g −1 , and is one of the several POSs that can obtain considerable BET surface areas by N 2 sorption (Table S2 †). 1,2 Compared with crystalline monomers, NDA and NDSA (Fig. 1C), the X-ray diffraction (XRD) pattern of NA-POS-1 still displays a set of strong Bragg diffraction peaks at 2 θ = 11.7°, 14.1°, 16.3°, 18.0°, 22.9°, 25.6° and 26.9°, indicating its highly crystalline structure with well-ordered arrangements.…”