JAFRI, Sadaf Fatima; KOUMOUSI, Evangelia; ARRIO, Marie-Anne; JUHIN, Amélie; MITCOV, Dmitri; ROUZIÈRES, Mathieu; DECHAMBENOIT, Pierre; LI, Dongfeng; OTERO, Edwige; WILHELM, Fabrice; ROGALEV, Andrei; JOLY, Loic; KAPPLER, Jean-Paul; CARTIER DIT MOULIN, Christophe; MATHONIÈRE, Corine; CLÉRAC, Rodolphe; SAINCTAVIT, Philippe

doi:10.1021/jacs.8b10484

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Licence d’utilisation du document

JAFRI, Sadaf Fatima
Institut de minéralogie, de physique des matériaux et de cosmochimie [IMPMC]

KOUMOUSI, Evangelia
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de Recherche Paul Pascal [CRPP]

ARRIO, Marie-Anne
Institut de minéralogie, de physique des matériaux et de cosmochimie [IMPMC]

Langue

Article de revue

Ce document a été publié dans

Journal of the American Chemical Society. 2019-02-27, vol. 141, n° 8, p. 3470-3479

American Chemical Society

Résumé en anglais

Molecular complexes based on Prussian Blue analogues have recently attracted considerable interest for their unique bistable properties combined to ultimately reduced dimensions. Here, we investigate the first dinuclear FeCo complex exhibiting both thermal and photomagnetic bistability in the solid state. Through an experimental and theoretical approach combining local techniques—X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD), and ligand field multiplet calculations—we were able to evidence the changes occurring at the atomic scale in the electronic and magnetic properties. The spectroscopic studies were able to fully support at the atomic level the following conclusions: (i) the 300 K phase and the light-induced excited state at 4 K are both built from FeLSIII–CoHSII paramagnetic pairs with no apparent reorganization of the local structure, (ii) the 100 K phase is composed of FeLSII–CoLSIII diamagnetic pairs, and (iii) the light-induced excited state is fully relaxed at an average temperature of ≈50 K. In the paramagnetic phase at 2 K, XAS and XMCD reveal that both Fe and Co ions exhibit a rather large orbital magnetic moment (0.65 μB and 0.46 μB, respectively, under an external magnetic induction of 6.5 T), but it was not possible to detect a magnetic interaction between spin centers above 2 K.< Réduire

Mots clés en anglais

Atomic Scale Evidence

Photomagnetic CoFe Dinuclear Prussian Blue Analogue

DOI

http://dx.doi.org/10.1021/jacs.8b10484

Project ANR

Commutateur Photo-Magnétique Unimoléculaire - ANR-10-BLAN-0712
Association Contrôlée de Molécules-Aimants pour une nouvelle Génération de Matériaux magnétiques
Synthèse et étude de chaines aimant photocommutables

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026