Synthèse, caractérisation et propriétés de nouveaux complexes /polymère à base de pyrazole et d’imidazole.

Abstract

The syntheses, done and repported in the present thesis, consists of two steps, the first one is a heating reaction, in an homogenus batch reactor, the second is the formation of a coordination compound, by environmental exposure and slow evaporation of solvent. This thesis is made of four chapters, the first one is dedicated to the theory of the reactants, solvents and reactors. The second, is made of the synthesis, with a N-methylation of the ligand of the second compound, spectral IRm UV-visible study and a caracterisation by XRay, with elementary analysis of the following three structures: - Hexa (µ2-chloro) (µ4-oxo) (tétra-imidazole) tétra copper (II), in ethanol - Hexa (µ2-chloro) (µ4-oxo) Tétra (méthyle-1pyrazole) tétra copper(II) - Tri (µ-chloro) (µ3-oxo) tri (µ2-pyrazolo) bis (1H-pyrazole) tricopper (II) Its about two tetramers, with a tetranucleic unit and of type [Cu4OCl6L4], and a polymer with a trinucleic unit [Cu3(μ-Cl)3(μ3O)], of which the synthesis mode is original and new. Indeed, while the heating of the solution in the batch reactor, the copper atom of the CuCl2.2H2O salt, is reducted in copper I, then oxyded, by simple contact of atmospheric dioxygen of the environment, dissolved in solution, to form the oxo copper tetramer or trimer. The N-methylation reaction of the 1H-pyrazole ligand, was performed in a batch reactor, in the presence of methanol, playing the double role of reactant and solvent, this is in contrast with literature, where the reaction is only performed in acidic environment. The reaction precursor is the copper cation Cu++, who conferred the acidic character to the solution, allowing the hemolytic rupture of the C-O bond of methanol. The structure madding the third chapter, is known and published, it is about the complex [Cu(Py)4.SO4.H2O], witch was characterized by Xray, UV-visible spectra, at least, it was about the study of its catalytic properties, by the mean of a cross-coupling reaction C-N, called Chan-Evans-Lam reaction. In comparison with literature, this complex is a good catalyst for the three following amines, aniline, 2-amino-pyridin and 2, 6 diisopropyl-anilin. The last chapter concerns the synthesis, X-ray characterization, Uv-visible and flurimetry studies of the main coordination complex [CoCl2(C3H4N2)4], who was found to be a good green light emitter.