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Synthèse et caractérisations de matériaux moléculaires magnétiques

Abstract : This dissertation describes the syntheses of 3d-4f-metal complexes starting from preformed compounds of Mn, Fe and Co, lanthanide salts and organic ligands and also the investigation of their structures and properties. 41 new polynuclear heterometallic metal complexes were synthesised in the course of this work with different interesting properties. The structures of all obtained compounds have been confirmed using X-ray diffraction. The magnetic properties of 22 complexes were studied, of which four show frequency dependent out-of-phase signals as expected for SMMs. The catalytic activity of calcinated {Mn4Dy6Li2} was investigated and proved effective for the oxidation of CO. It was established, that the use of precursors leads to new families of compounds. Moreover the study of isostructural compounds across the lanthanide series showed 1) that the incorporation of 4f ions introduces magnetic anisotropy and 2) DyIII is usually the best candidate for targeting 3d-4f- SMMs.
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  • HAL Id : tel-00755137, version 1



Jürgen Feuersenger. Synthèse et caractérisations de matériaux moléculaires magnétiques. Matériaux. Université Sciences et Technologies - Bordeaux I, 2010. Français. ⟨tel-00755137⟩



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