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Contribution à l'élaboration de molécules paramagnétiques précurseurs d'édifices supramoléculaires à couches ouvertes: polyradicaux à squelette phosphoré et complexes organo-métalliques.

Abstract : The rational synthesis of magnetic supramolecular materials depends on the development of new molecular building-blocks which are behind both the chemical architecture and the collective properties exhibited by the system. Two type of molecular synthons have been studied in this work. The first concerns polyradical aminoxyl-substituted phospine derivatives; the second paramagnetic organometallic species. In order to evaluate the role played by the phosphorus atom on the intramolecular exchange interaction, two polyradicals, a bi- and a tri-aminoxyl derivative, have been prepared, their magnetic properties investigated in solid state and in solution, and the spin distribution over the molecules determined by MAS-NMR, EPR and DFT calculation. The second family of molecules considered are Cr(III) derivatives for which the coordination sphere comprises either a cyclopentanienyl or a hydro-tris-pyrazolyl borate ligand, and the bridging ligands cyanide or azide. Such molecules were envisaged as modules for the preparation of finite magnetic architectures, i.e. spin clusters.
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Submitted on : Tuesday, September 30, 2003 - 4:01:09 PM
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Oscar Benedi Borobia. Contribution à l'élaboration de molécules paramagnétiques précurseurs d'édifices supramoléculaires à couches ouvertes: polyradicaux à squelette phosphoré et complexes organo-métalliques.. Autre. Université Sciences et Technologies - Bordeaux I, 2003. Français. ⟨tel-00003437⟩

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