Sick T, Rotter JM, Reuter S, Kandambeth S, Bach NN, Döblinger M, Merz J, Clark T, Marder TB, Bein T, Medina DD (2019)
Publication Type: Journal article
Publication year: 2019
DOI: 10.1021/jacs.9b02800
Two-dimensional covalent organic frameworks (2D COFs) attract great interest owing to their well-defined pore structure, thermal stability, high surface area, and permanent porosity. In combination with a tunable chemical pore environment, COFs are intriguing candidates for molecular sieving based on selective host-guest interactions. Herein, we report on 2D COF structures capable of reversibly switching between a highly correlated crystalline, porous and a poorly correlated, nonporous state by exposure to external stimuli. To identify COF structures with such dynamic response, we systematically studied the structural properties of a family of two-dimensional imine COFs comprising tris(4-aminophenyl)benzene (TAPB) and a variety of dialdehyde linear building blocks including terephthalaldehyde (TA) and dialdehydes of thienothiophene (TT), benzodithiophene (BDT), dimethoxybenzodithiophene (BDT-OMe), diethoxybenzodithiophene (BDT-OEt), dipropoxybenzodithiophene (BDT-OPr), and pyrene (Pyrene-2,7). TAPB-COFs consisting of linear building blocks with enlarged π-systems or alkoxy functionalities showed significant stability toward exposure to external stimuli such as solvents or solvent vapors. In contrast, TAPB-COFs containing unsubstituted linear building blocks instantly responded to exposure to these external stimuli by a drastic reduction in COF layer correlation, long-range order, and porosity. To reverse the process we developed an activation procedure in supercritical carbon dioxide (scCO
APA:
Sick, T., Rotter, J.M., Reuter, S., Kandambeth, S., Bach, N.N., Döblinger, M.,... Medina, D.D. (2019). Switching on and off Interlayer Correlations and Porosity in 2D Covalent Organic Frameworks. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.9b02800
MLA:
Sick, Torben, et al. "Switching on and off Interlayer Correlations and Porosity in 2D Covalent Organic Frameworks." Journal of the American Chemical Society (2019).
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