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Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
Published on: May 12, 2023
Negative linear compressibility of a metal-organic framework
Wei Li1, Michael R Probert, Monica Kosa
1Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, United Kingdom.
Journal of the American Chemical Society
|July 5, 2012
Summary
A novel 3D zinc formate framework exhibits significant mechanical anisotropy and negative linear compressibility. Under high pressure, structural changes lead to axis shrinkage and this unique NLC effect.
Area of Science:
- Materials Science
- Crystallography
- Solid-State Chemistry
Background:
- 3D hybrid zinc formate frameworks are of interest for their unique structural and mechanical properties.
- Understanding mechanical anisotropy and negative linear compressibility (NLC) is crucial for designing advanced materials.
Purpose of the Study:
- To investigate the mechanical properties of a 3D hybrid zinc formate framework, specifically its anisotropy and NLC.
- To elucidate the structural mechanisms behind the observed NLC effect under pressure.
Main Methods:
- High-pressure single-crystal X-ray diffraction was employed to study structural changes.
- Density functional theory calculations were used to analyze bonding and structural responses.
Main Results:
- The framework, [NH(4)][Zn(HCOO)(3)], with an acs topology, demonstrated high mechanical anisotropy.
- Negative linear compressibility was observed along the c axis under increasing pressure.
- Contraction of Zn-O bonds and formate ligand tilting were identified as key structural drivers for NLC.
Conclusions:
- The studied zinc formate framework exhibits significant NLC along its c axis due to pressure-induced structural rearrangements.
- This finding highlights the potential of metal-organic frameworks for applications requiring specific mechanical responses.
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