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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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New functionalized MIL-53(In) solids: syntheses, characterization, sorption, and structural flexibility.
Lei Wu1,2, Gérald Chaplais3,4, Ming Xue5
1Polymer Materials & Engineering Department, School of Materials Science & Engineering, Chang'an University Xi'an 710064 China wulei@chd.edu.cn.
RSC Advances
|May 6, 2022
Summary
Functionalizing indium-based metal-organic frameworks (MIL-53(In)) with different chemical groups alters their pore properties. Bromine and nitro groups enhance nitrogen adsorption, while hydroxyl groups block porosity.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Metal-organic frameworks (MOFs) offer tunable porosity for various applications.
- MIL-53(In) is a flexible MOF with potential for gas storage and separation.
- Functionalization of MOF linkers can modify framework properties and guest interactions.
Purpose of the Study:
- To synthesize and characterize functionalized MIL-53(In) materials.
- To investigate the impact of linker functional groups on framework flexibility and pore accessibility.
- To explore how different substituents influence gas adsorption properties.
Main Methods:
- Synthesis of functionalized MIL-53(In) with varying terephthalate linkers (-(OH)2, -Br, -NO2).
- Characterization using single crystal X-ray diffraction, N2 adsorption-desorption isotherms, and infrared spectroscopy.
- Analysis of dynamic framework behavior and guest-framework interactions.
Main Results:
- Dihydroxyl functionalization resulted in a loss of accessible porosity.
- Bromine and nitro functionalization modulated the framework's ability to adsorb nitrogen.
- Steric hindrance and chemical nature of substituents influenced framework flexibility and guest interactions.
Conclusions:
- Linker functionalization is a viable strategy to tune MIL-53(In) properties.
- Specific functional groups (-Br, -NO2) can enhance nitrogen accommodation.
- Framework flexibility and pore accessibility are sensitive to linker modification.
