Chemically Stable Carbazole-Based Imine Covalent Organic Frameworks with Acidochromic Response for Humidity Control Applications
Gilmanova L, Bon V, Shupletsov L, Pohl D, Rauche M, Brunner E, Kaskel S (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 143
Pages Range: 18368-18373
Journal Issue: 44
DOI: 10.1021/jacs.1c07148
Abstract
Isoreticular chemically stable two-dimensional imine covalent organic frameworks (COFs), further denoted as DUT-175 and DUT-176, are obtained in a reaction of 4,4′-bis(9H-carbazol-9-yl)biphenyl tetraaldehyde with phenyldiamine and benzidine. The crystal structures, solved and refined from the powder X-ray diffraction data and confirmed by high-resolution transmission electron microscopy, indicate AA-stacked layer structures. Both structures feature distorted hexagonal channel pores, assuring remarkable porosity (SBET = 1071 m2 g-1 for DUT-175 and SBET = 1062 m2 g-1 for DUT-176), as confirmed by adsorption of gases and vapors. The complex conjugated πsystem of the COFs involves electron-rich carbazole building units, which in combination with the imine groups allow reversible pH-dependent protonation of the frameworks, accompanied by charge transfer and shift of the absorption bands in the UV-vis spectrum. The sigmoidal shape of the water vapor adsorption and desorption isotherms with a steep adsorption step at p/p0 = 0.4-0.6 in combination with excellent stability over dozens of adsorption and desorption cycles ranks these COFs among the best materials for indoor humidity control applications.
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APA:
Gilmanova, L., Bon, V., Shupletsov, L., Pohl, D., Rauche, M., Brunner, E., & Kaskel, S. (2021). Chemically Stable Carbazole-Based Imine Covalent Organic Frameworks with Acidochromic Response for Humidity Control Applications. Journal of the American Chemical Society, 143(44), 18368-18373. https://doi.org/10.1021/jacs.1c07148
MLA:
Gilmanova, Leisan, et al. "Chemically Stable Carbazole-Based Imine Covalent Organic Frameworks with Acidochromic Response for Humidity Control Applications." Journal of the American Chemical Society 143.44 (2021): 18368-18373.
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