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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Bond breakage under pressure in a metal organic framework
Zhi Su1,2, Yu-Run Miao1, Guanghui Zhang3
1Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , USA .
Chemical Science
|March 24, 2018
Summary
Mechanical compression causes metal-organic frameworks (MOFs) to collapse, breaking bonds and absorbing significant energy. This study reveals endothermic bond breakage in UiO-66 MOF upon compression, demonstrating its potential as a mechanical energy absorber.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Porous materials, including metal-organic frameworks (MOFs), experience reduced internal free volume under mechanical compression.
- This volume collapse can trigger significant chemical changes within the material's structure.
Purpose of the Study:
- To investigate the chemical consequences of compression-induced volume collapse in MOFs.
- To characterize the mechanochemical reactions occurring in MOFs under external compression.
- To evaluate the potential of MOFs as mechanical energy absorbers.
Main Methods:
- Bulk compression of UiO-66 MOF to 1.9 GPa.
- Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy to determine Zr-O bond characteristics.
- Infrared (IR) spectroscopy to analyze carboxylate group ligation.
- In situ scanning electron microscopy (SEM) of single crystal nanocompression (600 nm).
Main Results:
- Compression led to a decrease in the effective number of Zr-O bonds in UiO-66 from 4.0 to 1.9, indicating bond breakage.
- Simultaneous collapse of the internal free volume was observed.
- IR spectra confirmed the conversion of syn-syn bridging carboxylates to monodentate ligation.
- UiO-66 nanocrystals absorbed substantial mechanical energy (approximately 4 kJ g⁻¹).
Conclusions:
- External compression induces mechanochemical bond breakage and structural transformation in MOFs.
- UiO-66 exhibits endothermic bond breakage upon compression, absorbing significant mechanical energy.
- MOFs show promise as effective mechanical energy absorbers for various compression scenarios.
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