A1 Journal article (refereed)
Room-Temperature Magnetic Bistability in a Salt of Organic Radical Ions (2021)

Taponen, A. I., Ayadi, A., Lahtinen, M. K., Oyarzabal, I., Bonhommeau, S., Rouzières, M., Mathonière, C., Tuononen, H. M., Clérac, R., & Mailman, A. (2021). Room-Temperature Magnetic Bistability in a Salt of Organic Radical Ions. Journal of the American Chemical Society, 143(39), 15912-15917. https://doi.org/10.1021/jacs.1c07468

JYU authors or editors

Taponen, Anni
Ayadi, Awatef
Lahtinen, Manu
Tuononen, Heikki
Mailman, Aaron

Publication details

All authors or editors: Taponen, Anni I.; Ayadi, Awatef; Lahtinen, Manu K.; Oyarzabal, Itziar; Bonhommeau, Sébastien; Rouzières, Mathieu; Mathonière, Corine; Tuononen, Heikki M.; Clérac, Rodolphe; Mailman, Aaron

Journal or series: Journal of the American Chemical Society

ISSN: 0002-7863

eISSN: 1520-5126

Publication year: 2021

Publication date: 21/09/2021

Volume: 143

Issue number: 39

Pages range: 15912-15917

Publisher: American Chemical Society (ACS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1021/jacs.1c07468

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/85074

Abstract

Cocrystallization of 7,7′,8,8′-tetracyanoquinodimethane radical anion (TCNQ–•) and 3-methylpyridinium-1,2,3,5-dithiadiazolyl radical cation (3-MepyDTDA+•) afforded isostructural acetonitrile (MeCN) or propionitrile (EtCN) solvates containing cofacial π dimers of homologous components. Loss of lattice solvent from the diamagnetic solvates above 366 K affords a high-temperature paramagnetic phase containing discrete TCNQ–• and weakly bound π dimers of 3-MepyDTDA+•, as evidenced by X-ray diffraction methods and magnetic susceptibility measurements. Below 268 K, a first-order phase transition occurs, leading to a low-temperature diamagnetic phase with TCNQ–• σ dimer and π dimers of 3-MepyDTDA+•. This study reveals the first example of cooperative interactions between two different organic radical ions leading to magnetic bistability, and these results are central to the future design of multicomponent functional molecular materials.

Keywords: organic compounds; free radicals; magnetic properties

Fields of science: