Synthèse, caractérisation et étude structurale de composés hybrides et mixtes à base de métaux de transition.

Abstract

This study involves the design, synthesis and structural analysis of supramolecular architectures obtained by self-assembly, based on the concepts of supramolecular chemistry. This branch explores the properties of organometallic molecules called hybrid materials organics-inorganics. These materials typically incorporate sites of coordination connected to well-chosen skeletons with defined geometries. These sites oriented by the geometry of the skeleton, can participate in intermolecular interactions that are sufficiently strong and directional to control the topology of the resulting assembly. This strategy is thereby based on self-assembly processes involving reversible interactions between units. Self-assembly directed by strong directional intermolecular interactions is widely used to produce materials whose components must be positioned in three dimensions (3D) in a predictable way. This strategy can also be used to control molecular association in two dimensions (2D), thereby allowing the construction of predictably organized and predetermined patterns on various compounds. Our work has focused on the behavior of the amine and N-donor’s groups as primary sites of coordination. These groups are analogues of other groups, which have been widely used in previous studies of directed molecular assembly. Also, we have studied the 3D and 2D association of compounds with N-donor’s ligand 4, 4’-bpy designed to favor the formation of sheets to promote the formation of intermolecular hydrogen bonds. The ability of these compounds to form predictably ordered 2D patterns and their organization in 3D has been investigated by Xray diffraction. In our study, we have systematically changed various parameters to examine their effect on molecular organization. Our results suggest that combined structural analyses in 2D and 3D are an important asset in the effort to understand the act of hydrogen bonds in the construction of the network of the crystal.