Two-dimensional sp2 carbon–conjugated covalent organic frameworks

Jin E, Asada M, Xu Q, Dalapati S, Addicoat MA, Brady MA, Xu H, Nakamura T, Heine T, Chen Q, Jiang D (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Science American Association for the Advancement of Science

Book Volume: 357

Pages Range: 673-676

Journal Issue: 6352

DOI: 10.1126/science.aan0202

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 electron volts 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.

Involved external institutions

Japan Advanced Institute of Science and Technology (JAIST) / 北陸先端科学技術大学院大学 JP Japan (JP) National Institute of Natural Sciences (NINS) / 自然科学研究機構 JP Japan (JP) Nottingham Trent University GB United Kingdom (GB) Lawrence Berkeley National Laboratory (LBNL) US United States (USA) (US) Universität Leipzig DE Germany (DE)

How to cite

APA:

Jin, E., Asada, M., Xu, Q., Dalapati, S., Addicoat, M.A., Brady, M.A.,... Jiang, D. (2017). Two-dimensional sp2 carbon–conjugated covalent organic frameworks. Science, 357(6352), 673-676. https://doi.org/10.1126/science.aan0202

MLA:

Jin, Enquan, et al. "Two-dimensional sp2 carbon–conjugated covalent organic frameworks." Science 357.6352 (2017): 673-676.

BibTeX: Download