A Porous Crystalline Nitrone-Linked Covalent Organic Framework
Daria Kurandina1, Banruo Huang2, Wentao Xu1
1Department of Chemistry and Kavli Energy Nanoscience Institute, University of California, Berkeley, Berkeley, CA, 94720, USA.
Angewandte Chemie (International Ed. in English)
|July 13, 2023
Summary
We synthesized a novel nitrone-linked covalent organic framework (COF-115) with potential for atmospheric water harvesting and CO2 capture. This new porous material, COF-115, can also undergo photoinduced rearrangement.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Nanotechnology
Background:
- Covalent organic frameworks (COFs) are crystalline porous polymers with tunable properties.
- N-oxide-based materials show promise for gas capture and water harvesting.
- Developing novel COF architectures is crucial for advancing materials science.
Purpose of the Study:
- To synthesize and characterize a new nitrone-linked covalent organic framework, COF-115.
- To evaluate the COF-115's potential for atmospheric water harvesting and CO2 capture.
- To investigate the photoinduced rearrangement of COF-115.
Main Methods:
- Polycondensation reaction between N,N',N',N''-(ethene-1,1,2,2-tetrayltetrakis(benzene-4,1-diyl))tetrakis(hydroxylamine) and terephthaladehyde.
- Solid-state 13C NMR spectroscopy and Fourier-transform infrared spectroscopy for structural confirmation.
- Low-pressure N2, CO2, and H2 sorption experiments to assess porosity.
- Water vapor and CO2 sorption analysis.
- Density functional theory (DFT) calculations.
Main Results:
- Successful synthesis of nitrone-linked COF-115.
- Confirmation of nitrone functionality using spectroscopic techniques.
- Demonstration of permanent porosity in COF-115.
- Superior water vapor and CO2 sorption capacity compared to imine-linked COFs.
- Insights into adsorption properties provided by DFT calculations.
- Successful photoinduced rearrangement of COF-115 to an amide-linked material.
Conclusions:
- COF-115 exhibits significant potential for atmospheric water harvesting and CO2 capture applications.
- N-oxide-based porous materials offer advantages for environmental applications.
- The photoinduced rearrangement capability adds a new dimension to COF functionality.
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