6533b828fe1ef96bd128904e
RESEARCH PRODUCT
Room-Temperature Magnetic Bistability in a Salt of Organic Radical Ions
Mathieu RouzièresHeikki M. TuononenSébastien BonhommeauManu LahtinenRodolphe CléracAaron MailmanItziar OyarzabalItziar OyarzabalItziar OyarzabalAnni I. TaponenCorine MathonièreAwatef Ayadisubject
magneettiset ominaisuudetDimer02 engineering and technologyGeneral Chemistry[CHIM.MATE]Chemical Sciences/Material chemistry010402 general chemistry021001 nanoscience & nanotechnologyvapaat radikaalit01 natural sciencesBiochemistryTetracyanoquinodimethaneMagnetic susceptibilityCatalysis0104 chemical scienceschemistry.chemical_compoundParamagnetismCrystallographyColloid and Surface ChemistryRadical ionchemistryDiamagnetismPropionitrileIsostructural0210 nano-technologyorgaaniset yhdisteetdescription
International audience; Cocrystallization of 7,7′,8,8′-tetracyanoquinodimethane radical anion (TCNQ −•) and 3-methylpyridinium-1,2,3,5dithiadiazolyl 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-09-21 |