MILIN, Eric; PATINEC, Véronique; TRIKI, Smail; BENDEIF, El-Eulmi; PILLET, Sébastien; MARCHIVIE, Mathieu; CHASTANET, Guillaume; BOUKHEDDADEN, Kamel

doi:10.1021/acs.inorgchem.6b01081

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MILIN, Eric
Chimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]

PATINEC, Véronique
Chimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]

TRIKI, Smail
Chimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]

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Article de revue

Ce document a été publié dans

Inorganic Chemistry. 2016-11-21, vol. 55, n° 22, p. 11652-11661

American Chemical Society

Résumé en anglais

We report a two-dimensional Hofmann-like spin-crossover (SCO) material, [Fe(trz-py)2{Pt(CN)4}]·3H2O, built from [FePt(CN)4] layers separated by interdigitated 4-(2-pyridyl)-1,2,4,4H-triazole (trz-py) ligands with two symmetrically inequivalent FeII sites. This compound exhibits an incomplete first-order spin transition at 153 K between fully high-spin (HS-HS) and intermediate high-spin low-spin (HS-LS) ordered states. At low temperature, it undergoes a bidirectional photoswitching to HS-HS and fully low-spin (LS-LS) states with green and near-IR light irradiation, respectively, with associated T(LIESST = Light-Induced Excited Spin-State Trapping) and T(reverse-LIESST) values of 52 and 85 K, respectively. Photomagnetic investigations show that the reverse-LIESST process, performed from either HS-HS or HS-LS states, enables access to a hidden stable LS-LS state, revealing the existence of a hidden thermal hysteresis. Crystallographic investigations allowed to identify that the strong metastability of the HS-LS state originates from the existence of a strong elastic frustration causing antiferroelastic interactions within the [FePt(CN)4] layers, through the rigid NC-Pt-CN bridges connecting the inequivalent FeII sites. The existence of the stable LS-LS state paves the way for a multidirectional photoswitching and allows potential applications for electronic devices based on ternary digits.< Réduire

DOI

http://dx.doi.org/10.1021/acs.inorgchem.6b01081

Project ANR

Bistabilité magnétique dans de nouveaux systèmes moléculaires à base de ligands anioniques pontants

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Importé de hal

Unités de recherche

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