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Ferromagnetic Chain Based on Verdazyl-Nitroxide Diradical

27 May 2020, Version 1

Abstract

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.

Keywords

verdazyl radicals
nitroxides
triplet diradicals
high-spin molecules
Ferromagnetic Chains

Supplementary materials

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Version History

May 27, 2020 Version 1

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The content is available under CC BY NC ND 4.0 [opens in a new tab]

DOI

10.26434/chemrxiv.12367334.v1
D O I: 10.26434/chemrxiv.12367334.v1 [opens in a new tab]

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)

Author’s competing interest statement

Authors do not declare any conflict of interest

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