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Relation structure - propriétés de commutation dans les matériaux à transition de spin : effet de nanostructuration et de dilution du cation métallique

Abstract : In the last years, intensive research activity has been dedicated to iron(II)-based spin transition compounds, for a better understanding of the fundamental phenomena as within the scope of practical application. These molecular materials possess two electronic configurations, which are interchangeable by the application of an external perturbation (thermal and optic bistability). Strong electron-lattice coupling may lead to cooperative behaviour, consequently abrupt spin transitions and hysteretic behaviour at the origin of a memory effect. Understanding and controlling this property is of primary interest in fundamental and applied research. The influence of metal dilution on the photo-induced transitions in FexZn1-x(btr)2(NCS)2.H2O is investigated by X-Ray diffraction on single crystals. We suggest a microscopic model interpreting the dynamics of the phase transition (nucleation and growth mechanisms of spin-like domains) through a structural analysis of the diffraction data. The effects of nanostructuration on the physicochemical properties have been studied on the one-dimensional coordination polymer [Fe(Htrz)2trz](BF4). Different surfactant-based organized molecular systems with various structural organizations are chosen for the synthesis in confined environments: reverse micellar solutions as well as lamellar (Lalpha) and reverse hexagonal (HII) liquid crystal phases. A relationship between size and shape, microstructure and physicochemical properties is established with a specific attention to reaction dynamics in the liquid crystal phase
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https://hal.univ-lorraine.fr/tel-01746276
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Dorothea Felicitas Mader. Relation structure - propriétés de commutation dans les matériaux à transition de spin : effet de nanostructuration et de dilution du cation métallique. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10124⟩. ⟨tel-01746276⟩

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