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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Precise Control of Molecular Self-Diffusion in Isoreticular and Multivariate Metal-Organic Frameworks
Thomas M Osborn Popp1,2,3, Ariel Z Plantz2, Omar M Yaghi1,3
1Department of Chemistry, Kavli Energy NanoSciences Institute at Berkeley, and Berkeley Global Science Institute, University of California-Berkeley, Berkeley, California, 94720, USA.
Summary
Self-diffusion in metal-organic frameworks (MOFs) is tunable. Introducing amino groups to MOF linkers linearly adjusts solvent diffusion, primarily by altering pore aperture, not chemical interactions.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Understanding self-diffusion in isoreticular and multivariate (MTV) metal-organic frameworks (MOFs) is crucial for applications in drug delivery, separations, and catalysis.
- MOFs offer tunable pore sizes and chemical environments for precise molecular control.
Purpose of the Study:
- To investigate the factors influencing solvent self-diffusion within MOF-5, IRMOF-3, and MTV MOF-5/IRMOF-3 materials.
- To determine the role of linker functionalization and pore aperture on diffusion dynamics.
Main Methods:
- Apparent self-diffusion coefficients of solvents were measured in single crystals of MOF-5, IRMOF-3, and 17 MTV MOF-5/IRMOF-3 materials.
- N,N-dimethylformamide (DMF) diffusion was studied as a function of linker mole fraction.
- A series of solvents were tested in MOF-5 and IRMOF-3 to compare diffusion mechanisms.
Main Results:
- The self-diffusion coefficient of DMF in MTV MOFs was linearly tunable between MOF-5 and IRMOF-3 based on linker mole fraction.
- The ratio of self-diffusion coefficients in MOF-5 versus IRMOF-3 was consistent across various solvents, irrespective of polarity.
Conclusions:
- Average pore aperture is the dominant factor controlling diffusion dynamics when amino groups are introduced to MOF linkers.
- Solvent-linker chemical interactions play a secondary role compared to the geometric effect of pore size modification.
