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A Porous Crystalline Nitrone-Linked Covalent Organic Framework.

Authors :: Kurandina D
Huang B
Xu W
Hanikel N
Darù A
Stroscio GD
Wang K
Gagliardi L
Toste FD
Yaghi OM
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2023 Sep 04; Vol. 62 (36), pp. e202307674. Date of Electronic Publication: 2023 Jul 24.
Publication Year :: 2023
Abstract: Herein, we report the synthesis of a nitrone-linked covalent organic framework, COF-115, by combining N, 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-state <superscript>13</superscript> C multi cross-polarization magic angle spinning NMR spectroscopy of the <superscript>13</superscript> C-isotope-labeled COF-115 and Fourier-transform infrared spectroscopy. The permanent porosity of COF-115 was evaluated through low-pressure N <subscript>2</subscript> , CO <subscript>2</subscript> , and H <subscript>2</subscript> sorption experiments. Water vapor and carbon dioxide sorption analysis of COF-115 and the isoreticular imine-linked COF indicated a superior potential of N-oxide-based porous materials for atmospheric water harvesting and CO <subscript>2</subscript> capture 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.<br /> (© 2023 Wiley-VCH GmbH.)