3D Covalent Organic Framework as a Metastable Intermediate in the Formation of a Double-Stranded Helical Covalent Polymer
- PAR ID:
- 10434766
- Date Published:
- Journal Name:
- Journal of the American Chemical Society
- Volume:
- 145
- Issue:
- 28
- ISSN:
- 0002-7863
- Page Range / eLocation ID:
- 15547 to 15552
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Abstract Herein, we report the synthesis of a nitrone‐linked covalent organic framework, COF‐115, by combiningN,N′,N′,N′′′‐(ethene‐1, 1, 2, 2‐tetrayltetrakis(benzene‐4, 1‐diyl))tetrakis(hydroxylamine) and terephthaladehyde via a polycondensation reaction. The formation of the nitrone functionality was confirmed by solid‐state13C multi cross‐polarization magic angle spinning NMR spectroscopy of the13C‐isotope‐labeled COF‐115 and Fourier‐transform infrared spectroscopy. The permanent porosity of COF‐115 was evaluated through low‐pressure N2, CO2, and H2sorption experiments. Water vapor and carbon dioxide sorption analysis of COF‐115 and the isoreticular imine‐linked COF indicated a superior potential ofN‐oxide‐based porous materials for atmospheric water harvesting and CO2capture applications. Density functional theory calculations provided valuable insights into the difference between the adsorption properties of these COFs. Lastly, photoinduced rearrangement of COF‐115 to the associated amide‐linked material was successfully demonstrated.more » « less