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Aggregation-induced Radical and Room-Temperature Ferromagnets of Diketopyrrolopyrrole Derivatives

preprint
submitted on 27.11.2019 and posted on 03.12.2019 by Wenqiang Li, Weiya Zhu, Miao Zeng, Jiawen Zhou, Yuan Li
It is extremely challenging to prepare room-temperature ferromagnet (RTF) semiconductors as it is of great importance for development of electronic and spintronic devices in future. Herein, we report that significant radical signals were detected in three low bandgap small molecules based on diketopyrrolopyrrole derivatives, since these molecules have an open-shell singlet diradical ground state. A new mechanism of aggregation-induced radical (AIR) was proposed to interpret the origin of radical signals and the transformation from the aromatic structure to the quinoid-diradical (Q-D) structure in D-A type low bandgap organic semiconductors. More importantly, the molecule Py-TTDPP exhibited obvious ferromagnetism at room temperature, which also showed extensive radical signals due to the thermally-excited triplet state in aggregation state. It was the first report on the RTF based on neutral organic small molecule semiconductors. Our findings unambitiously indicate the coming of the room-temperature magnets based on organic small molecule radicals in future.

Funding

Pearl River S&T Nova Program of Guangzhou (201710010194)

History

Email Address of Submitting Author

celiy@scut.edu.cn

Institution

South China University of Technology

Country

China

ORCID For Submitting Author

0000-0002-7931-9879

Declaration of Conflict of Interest

The authors declare no conflict of interest.

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