Two-dimensional sp2 carbon–conjugated covalent organic frameworks

Jin, E., Asada, M., Xu, Q., Dalapati, S., Addicoat, M.A. ORCID: 0000-0002-5406-7927, Brady, M.A., Xu, H., Nakamura, T., Heine, T., Chen, Q. and Jiang, D., 2017. Two-dimensional sp2 carbon–conjugated covalent organic frameworks. Science, 357 (6352), pp. 673-676. ISSN 0036-8075

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Abstract

We synthesized a two-dimensional (2D) crystalline covalent organic framework (sp2c-COF) that was designed to be fully π-conjugated and constructed from all sp2-carbons by C=C condensation reactions of tetrakis(4-formylphenyl)pyrene and 1,4-phenylenediacetonitrile. The C=C linkages topologically connect pyrene knots at regular intervals into a 2D lattice with π-conjugations extended along both x and y directions, and develop an eclipsed layer framework rather than the more conventionally obtained disordered structures. The sp2c-COF is a semiconductor with a discrete band gap of 1.9 eV and can be chemically oxidized to enhance conductivity by 12 orders of magnitude. The generated radicals are confined on the pyrene knots, enabling the formation of a paramagnetic carbon structure with high spin density. The sp2-carbon framework induces ferromagnetic phase transition to develop spin-spin coherence and align spins unidirectionally across the material.

Item Type: Journal article
Publication Title: Science
Creators: Jin, E., Asada, M., Xu, Q., Dalapati, S., Addicoat, M.A., Brady, M.A., Xu, H., Nakamura, T., Heine, T., Chen, Q. and Jiang, D.
Publisher: American Association for the Advancement of Science
Date: 18 August 2017
Volume: 357
Number: 6352
ISSN: 0036-8075
Identifiers:
NumberType
10.1126/science.aan0202DOI
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 21 Aug 2017 14:23
Last Modified: 14 Sep 2017 10:57
URI: http://irep.ntu.ac.uk/id/eprint/31452

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