Synthèse, caractérisation et propriétés de nouveaux matériaux multifonctionnels incorporant des complexes de coordination

Abstract

This work deals with the synthesis by soft and hydrothermal synthesis, structural characterization and fluorescence study of new coordination complexes and hybrid compounds based on transition metals using three aromatic ligands. Three complexes with 2-(2- hydroxyethylpyridine) including two isostructural monomers and one-dimensional copper II polymer. These compounds have a layered structure whose junction is ensured via hydrogen bonds and π-π stacking. With the 2,2 ': 6', 2 '' - terpyridine ligand, two complexes were isolated. The first is a copper II tetramer whose four metal ions have a square-based pyramidal geometry. It is a layered structure where the junction is ensured via weak bonds and π-π stacking. The second is a triprotoneted hybrid compound where the three-dimensional structure is assured by moderate and weak hydrogen bonds. The two hybrid compounds obtained based on chlorine / bromine tetraphenylphosphonium have a structure in cationic and anionic layers which alternate along the c axe axis, the junction between them is ensured via hydrogen bonds and π-π stacking. Fluorescence analysis showed that all complexes exhibited strong (blue, cyan, and green) light emission, which are attributed to the charge transfer interaction π-π*; and a very high quantum efficiency with a very high fluorescence brightness. These fluorescent materials can be employed in photocatalysis as sensitizers in photovoltaic conversion processes and can be used in the determination of mixtures of coloring materials."