Open AccessRoom-Temperature Magnetic Bistability in a Salt of Organic Radical Ions
Author(s) -
Anni I. Taponen,
Awatef Ayadi,
Manu Lahtinen,
Itziar Oyarzabal,
Sébastien Bonhommeau,
Mathieu Rouzières,
Corine Mathonière,
Heikki M. Tuon,
Rodolphe Clérac,
Aaron Mailman
Publication year - 2021
Publication title -
journal of the american chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.115
H-Index - 612
eISSN - 1520-5126
pISSN - 0002-7863
DOI - 10.1021/jacs.1c07468
Subject(s) - diamagnetism , isostructural , chemistry , dimer , paramagnetism , acetonitrile , ion , crystallography , magnetic susceptibility , radical ion , tetracyanoquinodimethane , crystal structure , molecule , organic chemistry , condensed matter physics , magnetic field , physics , quantum mechanics
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.
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