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Propriétés magnétiques et photomagnétiques de composés de coordination construits à partir de briques cyanométallates

Abstract : Some molecular compounds exhibit switchable electronic properties induced by stimuli (T, P, B, h). Different electronic states can be stabilised under external conditions and the transformations between the two states are reversible. This property opens a new field for applications in information storage. This work deals with the influence of a light irradiation on magnetic proprerties in coordination networks built with cyanometallate precursors and metallic ion Co. We study in details, by magnetometry and optical refelectivity, photo-induced metastable states in hexa-, tri- et octa-cyanometallate compounds. The stability vs. temperatures, and also vs. time, of these states are showed. The studies of photomagnetic properties linked to structural ones allow to open discussion on the main role played by short interactions for the maintenance of metastable states. The most significant result of this work is the determination of T(LIESST) = 183 K in a molecular cluster, leading towards a new family of molecular materials exhibiting wide thermal bistability domain.
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Submitted on : Tuesday, July 7, 2009 - 6:04:45 PM
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Rémy Le Bris. Propriétés magnétiques et photomagnétiques de composés de coordination construits à partir de briques cyanométallates. Matériaux. Université Sciences et Technologies - Bordeaux I, 2008. Français. ⟨tel-00402628⟩

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