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Polynuclear manganese compounds with carboxylate bridging ligands models of redox enzymes. Insertion inside mesoporous supports. Study of their magnetic and catalytic properties

Abstract : The main objective of this work is the synthesis of manganese compounds and hybrid materials that may be relevant from a bioinorganic and magnetic point of view. The developed strategy comprises three main steps that form different sections in this thesis:(a)Synthesis and characterization of molecular manganese compounds and study of the magnetic propertiesThe crystal structure of twenty-three new Mn compounds of different nucleartities were obtained in which the Mn oxidation state is II, III, or IV. The magnetic properties of all these compounds were profoundly studied and they have been rationalized with their structural and electronic parameters. The MnII compounds were also studied with EPR spectroscopy. (b)Synthesis and characterization of hybrid materials based on molecular manganese compounds inside mesoporous silica.Selected molecular compounds were inserted inside mesoporous silica (MCM-41 type). The Mn complexes inside the supports were characterized with TGA, XPS, ICP-OES, IR spectroscopy, and magnetic measurements.(c)Study of the catalytic properties of both molecular compounds and hybrid materials.A family of the molecular compounds obtained in this work are structural and functional models of the Mn catalase, an enzyme found in some bacteria with antioxidant properties (H2O2 scavenger). The catalase activity for these compounds and the hybrid materials was studied in acetonitrile and water.
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Luis Escriche Tur. Polynuclear manganese compounds with carboxylate bridging ligands models of redox enzymes. Insertion inside mesoporous supports. Study of their magnetic and catalytic properties. Inorganic chemistry. Université de Lyon, 2016. English. ⟨NNT : 2016LYSEN041⟩. ⟨tel-01644125⟩

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