Key points are not available for this paper at this time.
Creating crystalline porous materials with large pores is typically challenging due to undesired interpenetration, staggered stacking, or weakened framework stability. Here, we report a pore size expansion strategy by “shape-matching” intermolecular π-π stacking interactions in a series of two-dimensional (2D) hydrogen-bonded organic frameworks (HOFs), HOF-10x (x = 0,1,2), self-assembled from pyrene-based tectons with systematic elongation of π-conjugated molecular arms. This strategy successfully avoids interpenetration or staggered stacking and expands the pore size of HOF materials to access mesoporous HOF-102, which features a surface area of ∼2,500 m2/g and the largest pore volume (1.3 cm3/g) to date among all reported HOFs. More importantly, HOF-102 shows significantly enhanced thermal and chemical stability as evidenced by powder X-ray diffraction and N2 isotherms after treatments in challenging conditions. Such stability enables the easy fabrication of a HOF-102/fiber composite for the efficient photochemical detoxification of a mustard gas simulant.
Ma et al. (Sat,) studied this question.