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Jin, E, Asada, M, Xu, Q, Dalapati, S, Addicoat, MA 
ORCID: https://orcid.org/0000-0002-5406-7927, Brady, MA, 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: | Number Type 10.1126/science.aan0202 DOI |
| Divisions: | Schools > School of Science and Technology |
| Record created by: | Jonathan Gallacher |
| Date Added: | 21 Aug 2017 14:23 |
| Last Modified: | 18 Feb 2018 03:00 |
| URI: | https://irep.ntu.ac.uk/id/eprint/31452 |
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