Résumé:
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."
