AI Article Synopsis
- This study investigates the mechanical stability of two metal-organic frameworks (MOFs), MIL-100(Cr) and MIL-101(Cr), focusing on how the type of linker (tritopic vs. ditopic) influences this stability.
- Using advanced techniques like synchrotron X-ray diffraction and infrared spectroscopy, the researchers demonstrate that MIL-100(Cr) remains stable under high pressure while MIL-101(Cr) does not.
- The superior stability of MIL-100(Cr) is attributed to its greater linker connectivity, which enhances the structural integrity of the material, providing insights for designing more resilient MOFs.
Article Abstract
The key parameters governing the mechanical stability of highly porous materials such as metal-organic frameworks (MOFs) are yet to be clearly understood. This study focuses on the role of the linker connectivity by investigating the mechanical stability of MIL-100(Cr), a mesoporous MOF with a hierarchical structure and a tritopic linker, and comparing it to MIL-101(Cr) having instead a ditopic linker. Using synchrotron X-ray diffraction and infrared spectroscopy, we investigate the high-pressure behavior of MIL-100(Cr) with both solid and fluid pressure transmitting media (PTM). In the case of a solid medium, MIL-100(Cr) undergoes amorphization at about 0.6 GPa, while silicone oil as a PTM delays amorphization until 12 GPa due to the fluid penetration into the pores. Both of these values are considerably higher than those of MIL-101(Cr). MIL-100(Cr) also exhibits a bulk modulus almost ten times larger than that of MIL-101(Cr). This set of results coherently proves the superior stability of MIL-100(Cr) under compression. We ascribe this to the higher connectivity of the organic linker in MIL-100(Cr), which enhances its interconnection between the metal nodes. These findings shed light on the importance of linker connectivity in the mechanical stability of MOFs, a relevant contribution to the quest for designing more robust MOFs.
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| http://dx.doi.org/10.1021/jacs.3c14589 | DOI Listing |
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