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Determining Surface Areas and Pore Volumes of Metal-Organic Frameworks

Determining Surface Areas and Pore Volumes of Metal-Organic Frameworks

Published on: March 8, 2024

Porous organic cages.

Tomokazu Tozawa¹, James T A Jones, Shashikala I Swamy

¹Department of Chemistry and Centre for Materials Discovery, University of Liverpool, Crown Street, Liverpool L69 7ZD, UK.

Nature Materials

|October 27, 2009

Summary

This summary is machine-generated.

Covalently bonded organic cages form crystalline microporous materials with prefabricated porosity. This modular approach allows for tunable porosity, exceeding that of comparable molecular solids.

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Area of Science:

Materials Science
Chemistry

Background:

Porous materials are crucial for applications like molecular separations and catalysis.
Current methods often rely on non-covalent self-assembly, which can limit structural control.

Purpose of the Study:

To demonstrate the formation of crystalline microporous materials from covalently bonded organic cages.
To explore the control over porosity through chemical functionality and modular construction.

Main Methods:

Synthesis of covalently bonded organic cages.
Assembly of cages into crystalline structures.
Characterization of porosity using gas adsorption (Brunauer-Emmett-Teller surface area).

Main Results:

Successfully assembled covalently bonded organic cages into crystalline microporous materials.
Achieved prefabricated and intrinsic porosity within the cage structures.
Demonstrated control over porosity by varying chemical functionality, producing both non-porous and permanently porous assemblies.
Observed surface areas and gas uptakes in porous assemblies exceeding comparable molecular solids.
Showcased the ability to convert cages into porous or non-porous polymorphs via recrystallization, with surface areas up to 550 m2 g(-1).

Conclusions:

Covalently bonded organic cages offer a route to modularly construct advanced porous organic solids.
The prefabricated porosity and tunable nature of these materials open new design principles for responsive porous materials.
This approach provides a versatile platform for creating tailored porous structures for diverse applications.