synthèse et caractérisation de composés hétérocycliques à propriétés spécifiques

Abstract

Tetrathiafulvalene (TTF) is one of the most studied heterocyclic molecules of the last forty years because of its electronic properties and the diversity of its applications. Indeed, the design of multifunctional materials, based on the motif tetrathiafulvalene (TTF), is a great challenge for the physical chemistry community. In this context, the objective of this work was to develop new organosulfur architectures, derived from the tetrathiafulvalene unit (TTF) or its π-extended derivative (Ex-TTF), conceived for obtaining materials has specific properties. We present in this manuscript the different strategies considered for the synthesis of these new molecules associating the tetrathiafulvalene motif with nitrogenous aromatic ligands. The electronic properties (spectroscopy, cyclic voltammetry) and / or (DFT calculation, X-ray diffraction) of these compounds have been studied. The complexing properties, in a number of cases, of these electroactive ligands have also been evaluated by UV-Visible spectroscopy. In addition, some of the ligands prepared have been the subject of a preliminary study of ion recognition by spectroscopic route; these architectures show an efficiency in detecting anions with better selectivity for the fluoride anion. Finally, these various precursors have been used for the preparation of charge transfer complexes, radical ion salts and coordination complexes with transition metals. Measurements of electrical conductivity reveal an insulating behavior for the set of elaborated solids.