A Wavy Two-Dimensional Covalent Organic Framework from Core-Twisted Polycyclic Aromatic Hydrocarbons


A high degree of crystallinity is an essential aspect in two-dimensional covalent organic frameworks, as many properties depend strongly on the structural arrangement of the different layers and their constituents. We introduce herein a new design strategy based on core-twisted polycyclic aromatic hydrocarbon as rigid nodes that give rise to a two-dimensional covalent organic framework with a wavy honeycomb (chairlike) lattice. The concave-convex self-complementarity of the wavy two-dimensional lattice guides the stacking of framework layers into a highly stable and ordered covalent organic framework that allows a full 3D analysis by transmission electron microscopy revealing its chairlike honeycomb facets and aligned mesoporous channels. Remarkably, the waviness of the framework does not disrupt the interlayer pi-pi stacking that shows charge transporting properties similar to those of planar covalent organic frameworks. The implementation of core-twisted aromatics as building blocks for covalent organic frameworks brings new possibilities in the design of highly ordered organic materials.



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Martinez-Abadia, M; Stoppiello, CT; Strutynski, K; Lerma-Berlanga, B; Marti-Gastaldo, C; Saeki, A; Melle-Franco, M; Khlobystov, AN; Mateo-Alonso, A

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M.M.-A. and A.M.-A. acknowledge support of the Basque Science Foundation for Science (Ikerbasque), POLYMAT, the University of the Basque Country (Grupo de Investigacion GIU17/054 and SGIker), Diputacion Foral de Guipuzcoa (OF215/2016(ES)), Gobierno Vasco (BERC program), and Gobierno de Espana (Ministerio de Economia y Competitividad CTQ2016-77970-R). M.M.-F. acknowledges support from the Portuguese Foundation for Science and Technology (FCT), under the projects PTDC/FIS-NAN/4662/2014, IF/00894/2015, and FCT ref. UID/CTM/50011/2019 for CICECO - Aveiro Institute of Materials. This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement no. 664878. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement nos. 722951 and 714122).

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