Skip to Main content Skip to Navigation
Theses

Complexes superstructurés de manganèse et de ruthénium à ligands polypyridiniques : synthèse, caractérisations, propriétés rédox et photorédox.

Abstract : This work deals with the synthesis and physico-chemical study of polynuclear ruthenium manganese complexes, which have been designed to mimic electron transfers in natural photosynthetic system.
With bis-bipyridine type ligands, we synthesized binuclear di-Μ-oxo manganese complexes, covalently linked to four ruthenium tris-bipyridine type subunits. By examining electrochemical and photochemical properties, we checked that photoinduced oxidations were thermodynamically favoured. It was confirmed by irradiation in the presence of a diazonium salt, that act as an irreversible electron acceptor. These irradiation led to different oxidized forms of the complexes in good yield
Using a bipyridine-terpyridine type ligand, a new manganese (II) complex covalently linked to two ruthenium tris-bipyridine moieties was synthesized. Its redox properties were identified and photoinduced electron transfer have also been investigated.
To better understand redox properties of this trinuclear complex, we studied electrochemical properties of some mononuclear manganese (II) complexes, [MnII(L)2]2+, in wich L is a terpyridinic ligand, (L = terpy = 2,2':6',2"-terpyridine, terpy-tolyl = 4'-tolyl-2,2':6',2"-terpyridine et tBu3-terpy = 4,4',4''-tri-tert-butyl-2,2':6',2"-terpyridine). We investigated these redox properties by examining the influence of presence of water in electrolytic medium. We succeeded in identification of oxidized forms, and we showed that in anhydrous medium, mononuclear manganese (III) are produced, while in the presence of water, high valent species, like tetranuclear complexes can be synthesized.
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00153015
Contributor : Sophie Romain <>
Submitted on : Friday, June 8, 2007 - 10:37:24 AM
Last modification on : Friday, November 6, 2020 - 4:13:24 AM
Long-term archiving on: : Thursday, April 8, 2010 - 7:16:14 PM

Identifiers

  • HAL Id : tel-00153015, version 1

Collections

CNRS | UJF | UGA

Citation

Sophie Romain. Complexes superstructurés de manganèse et de ruthénium à ligands polypyridiniques : synthèse, caractérisations, propriétés rédox et photorédox.. Autre. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00153015⟩

Share

Metrics

Record views

574

Files downloads

2451