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Ferromagnetic Chain Based on Verdazyl-Nitroxide Diradical

preprint
submitted on 25.05.2020 and posted on 27.05.2020 by Evgeny Tretyakov, Svetlana Zhivetyeva, Pavel Petunin, Dmitry Gorbunov, Nina Gritsan, Irina Bagryanskaya, Artem Bogomyakov, Pavel Postnikov, Maxim Kazantsev, Marina Trusova, Inna Shundrina, Elena Zaytseva, Dmitriy Parkhomenko, Elena Bagryanskaya, Victor Ovcharenko

Verdazyl-nitroxide diradicals were synthesized using the palladium-catalyzed cross-coupling reaction of the corresponding iodoverdazyls with a nitronyl nitroxide-2-ide gold(I) complex with high yields (up to 82%). The synthesized diradicals were found to be highly thermally stable and have a singlet (DEST » -64 cm–1) or triplet ground state (DEST ³ 25 and 100 cm–1), depending on which canonical hydrocarbon diradical type they belong to. Upon crystallization, triplet diradicals form unique one-dimensional (1D) spin S = 1 chains of organic diradicals with intrachain ferromagnetic coupling of J′/kB from 3 to 6 K.

Funding

Ministry of Science and Higher Education of the Russian Federation (State Project “Science” №FSWW-2020-0011)

Russian Science Foundation (grant No. 18-13-00173)

Ministry of Higher Education and Science of the Russian Federation (project 0304-2017-0008)

Russian Science Foundation (grant No. 18-13-00380)

History

Email Address of Submitting Author

postnikov@tpu.ru

Institution

Tomsk Polytechnic University

Country

Russia

ORCID For Submitting Author

0000-0001-9713-1290

Declaration of Conflict of Interest

Authors do not declare any conflict of interest

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