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Tuning the Structural Flexibility for Multi-Responsive Gas Sorption in Isonicotinate-Based Metal-Organic Frameworks
Yongwei Chen1, Karam B Idrees, Florencia A Son
1School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China.
ACS Applied Materials & Interfaces
|April 2, 2021
Summary
Flexible metal-organic frameworks (MOFs) exhibit tunable structural changes for gas sorption. Transition metal identity in these MOFs controls their dynamic response to various gases, enabling tailored gas separation applications.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Flexible metal-organic frameworks (MOFs) are programmable materials with dynamic structures.
- Their structural flexibility allows for unique gas sorption properties, surpassing rigid counterparts.
- Understanding stimuli-induced structural changes is key to optimizing MOF performance.
Purpose of the Study:
- To investigate the influence of transition metal identity on the gas sorption behavior of isonicotinate-based flexible MOFs.
- To elucidate the relationship between metal ion properties and framework dynamic response to different gases.
- To explore the potential for fine-tuning MOF flexibility for selective gas adsorption.
Main Methods:
- Synthesis of isonicotinate-based flexible MOFs with Mg, Mn, and Cu.
- Gas sorption isotherm measurements at various temperatures for C2H4, C2H6, Xe, Kr, and SO2.
- Analysis of structural dynamic response, including gate-opening behavior and shape memory effects.
Main Results:
- Mg(4-PyC)2 and Mn(4-PyC)2 frameworks showed gate-opening with C2H4, C2H6, and Xe, but not Kr.
- Cu(4-PyC)2 exhibited gate-opening solely with C2H4 due to open metal sites.
- SO2 triggered gate-opening in all three MOFs, with Cu(4-PyC)2 showing a shape memory effect.
- Framework flexibility correlated with metal ion chemical hardness (Mg2+ > Mn2+ > Cu2+), influencing gate-opening pressures.
Conclusions:
- Transition metal identity significantly controls the structural flexibility and gas sorption dynamics of flexible MOFs.
- The chemical hardness of metal ions is a critical factor in determining gate-opening behavior.
- These findings offer a pathway for designing MOFs with precisely tuned properties for targeted gas separation and storage applications.
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