Vapor-Phase Linker Exchange of the Metal-Organic Framework ZIF-8: A Solvent-Free Approach to Post-Synthetic Modification

Abstract

Zeolitic imidazolate frameworks (ZIFs) are as ubclass of metal-organic frameworks (MOFs). Although generally stable,ZIFs can undergo post-synthetic linker exchange (PSLE) in solution under mild conditions.Herein, we present an ovel, solvent-free approach to post-synthetic linker exchange through exposure to linker vapor.

Vapor linker exchange of partially amorphous metal–organic framework membranes for ultra‐selective gas separation

“…However, the rigorous processing conditions may limit the implementation of this method in controlling membrane microstructures. More recently, vapor phase linker exchange has been developed for changing the physicochemical properties of MOF materials 43–45 . Besides redesigning the pore structures and adsorption properties, we have also found that some amorphization of MOF powders occurred after linker exchange 43 .…”

“…More recently, vapor phase linker exchange has been developed for changing the physicochemical properties of MOF materials. [43][44][45] Besides redesigning the pore structures and adsorption properties, we have also found that some amorphization of MOF powders occurred after linker exchange. 43 We thus envisage whether linker exchange and amorphization can be simultaneously performed to enhance the permselectivity of MOF membranes.…”

Recent advances in the application of zeolitic imidazolate frameworks (ZIFs) in environmental remediation: a review

“…However, the disadvantage of the solvothermal method is the consumption of massive organic solvents. Thus, ZIFs with different morphologies can be obtained using different assisted techniques such as microwave-assisted, [59][60][61] vaporassisted conversion, [62][63][64] solvent-assisted ligand exchange, 43 and ultrasonic-assisted 65,66 methods. For instance, Mahmoodi et al synthesized ZIF-67 by an ultrasoundassisted method, which increased the mass transport rate due to the improved local turbulence/liquid microcirculation.…”

Pyrazine‐interior‐embodied MOF‐74 for selective CO2 adsorption

“…Here, we treated MOF-74 in high-temperature pyrazine vapor. As highlighted in previous literature,[26][27][28] vapor processing is an effective means to modify MOFs, affording a homogenous daughter MOF, as the vapor can freely flow through the pores and crystal boundaries of the precursor. Pyrazine-modified MOF-74 samples, namely py-MOF-74a, py-MOF-74b, and py-MOF-74c, which were washed with methanol and treated under the vacuum to remove the weakly stacked pyrazine molecules, show diffraction peaks similar to those of MOF-74, indicating no loss of crystallinity after modification with pyrazine (Figure1).A vibration peak at 440 cm À1 in the FTIR spectrum of pyrazinemodified MOF-74 can be assigned to the formation of Co-N bonds (Figure2A).…”