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Theses

Modulation des propriétés électroniques et de l'anisotropie magnétique de complexes mono et polynucléaires :
influence des ligands pontants et périphériques.

Abstract : The work described here shows the role played by the organic ligand in the modulation of the electronic properties of mono- and polynuclear transition metal complexes.
The first part reports first the study of the influence of the electronic effects (donor and acceptor) of the chelating ligand on the electrochemical behaviour of a family of Fe(III) mononuclear complexes. We also showed that it is possible to tune the optical properties of polynuclear mixed-valence complexes of the form FeIIBS(FeIIIHS)x (x = 4 and 6). Finally, we proposed a model that explains the origin of the ferromagnetic interaction in Prussian blue, one of the first coordination compound, for which complexes FeIIBS(FeIIIHS)x are models.
The second part deals with the study of magnetic anisotropy in Ni(II) mononuclear compounds. We show that it is possible to tune the amplitude and the nature of the magnetic anisotropy (axial, planar or rhombic) thanks to the judicious choice of the chelating ligands.
Finally, playing with the bridging and peripheral chelating ligands in binuclear Ni(II) complexes allows to tune the energy of the spin states of these complexes and then to show off a field induced spin crossover phenomenon. Hence, it is possible to determine the magnetic anisotropy of the excited spin states of polynuclear complexes possessing a ground state S =0.
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https://tel.archives-ouvertes.fr/tel-00108419
Contributor : Guillaume Rogez <>
Submitted on : Friday, October 20, 2006 - 4:27:44 PM
Last modification on : Wednesday, October 14, 2020 - 3:42:22 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 8:19:59 PM

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  • HAL Id : tel-00108419, version 1

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Guillaume Rogez. Modulation des propriétés électroniques et de l'anisotropie magnétique de complexes mono et polynucléaires :
influence des ligands pontants et périphériques.. Matériaux. Université Paris Sud - Paris XI, 2002. Français. ⟨tel-00108419⟩

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