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cyclization_18e_CHEMRXIV.pdf (1.57 MB)

Transformation Between 2D and 3D Covalent Organic Frameworks via Reversible [2+2] Cycloaddition

submitted on 21.02.2020, 22:09 and posted on 24.02.2020, 12:18 by Thaksen Jadhav, Yuan Fang, Cheng-Hao Liu, Afshin Dadvand, Ehsan Hamzehpoor, William Patterson, Antranik Jonderian, Robin Stein, Dmitrii F. Perepichka
We report the first transformation between crystalline vinylene-linked two-dimensional (2D) polymers and crystalline cyclobutane-linked three-dimensional (3D) polymers. Specifically, absorption-edge irradiation of the 2D poly(arylenevinylene) covalent organic frameworks (COFs) results in topological [2+2] cycloaddition cross-linking the π-stacked layers in 3D COFs. The reaction is reversible and heating to 200°C leads to a cycloreversion while retaining the COF crystallinity. The resulting difference in connectivity is manifested in the change of mechanical and electronic properties, including exfoliation, blue-shifted UV-Vis absorption, altered luminescence, modified band structure and different acid-doping behavior. The Li-impregnated 2D and 3D COFs show a significant ion conductivity of 1.8×10−4 S/cm and 3.5×10−5 S/cm, respectively. Even higher room temperature proton conductivity of 1.7×10-2 S/cm and 2.2×10-3 S/cm was found for H2SO4-treated 2D and 3D COFs, respectively.


US Army Office for Scientific Research (W911NF-17-1-0126)



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McGill University



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