Ferromagnetic Chain Based on Verdazyl-Nitroxide Diradical
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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 (D E ST » -64 cm –1 ) or triplet ground state (D E ST 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 ′/ k B from 3 to 6 K.
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- last seen: 2026-05-19T01:45:01.086888+00:00