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Coassembling Mesoporous Zeolitic Imidazolate Frameworks by Directed Reticular Chemistry.

Min Liu¹, Mehrdad Asgari², Katrina Bergmann¹

¹Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.

Journal of the American Chemical Society

|October 31, 2024

Summary

Researchers developed mesoporous zeolitic imidazolate frameworks (MesoZIFs) using directed reticular chemistry. These MesoZIFs offer improved mass transfer and pore accessibility for large molecules, enhancing catalytic and storage applications.

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Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Conventional zeolitic imidazolate frameworks (ZIFs) possess micropores, limiting mass transfer and accessibility for large molecules.
Overcoming these limitations is crucial for expanding ZIF applications in catalysis and gas storage.

Purpose of the Study:

To develop a novel method for synthesizing mesoporous ZIFs (MesoZIFs) with enhanced pore accessibility.
To demonstrate the improved performance of MesoZIFs compared to their microporous counterparts.

Main Methods:

Utilized directed reticular chemistry involving solvent evaporation-induced coassembly of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) and ZIF-8 building blocks.
Employed acetic acid (AcOH) to control coordination and amine for facilitated crystallization within PS-b-PEO micelles.
Tuned mesopore size by adjusting the molecular weight of PS-b-PEO.

Main Results:

Successfully synthesized MesoZIF-8 with tunable, ink bottle-shaped mesopores.
MesoZIF-8 demonstrated enhanced performance in Knoevenagel condensation reactions with large reactants.
Improved hydrogen storage capacity was observed in MesoZIF-8 compared to conventional ZIF-8.

Conclusions:

Established an efficient approach for creating MesoZIFs with accessible mesopores.
MesoZIFs offer a promising platform for enhancing ZIF performance in various applications.
This technique provides a pathway to overcome mass transfer limitations in ZIF-based materials.