This work is devoted to the synthesis and characterization of new carbon rich ruthenium acetylide complexes to reach original molecular wires and switches. The first part of this manuscript deals with the preparation, the photoisomerisation and electrochemical studies of a ruthenium trimetallic complex bearing two identical dithienylethene (DTE) moities. The goal is to control the stepwise closing of these photochromic units using light and electrochemical stimuli. Such a control was never obtained before. The second part describes an association of an ytterbium ion and a ligand bearing a DTE unit, in order to commute the light emission of the lanthanide center. This process is expected to happen through an energy quenching by the photochromic unit. In the third part, the synthesis and the physico-chemical studies of new molecular wires bearing thiol linkers are presented. The aim is to measure the electrical conductivity of such wires in molecular junctions. The last part of this manuscript deals with the synthesis and the characterization of several multiresponsive organometallic switches for surface adaptation. In that respect, these molecules posses thiol linkers to bind surfaces. The first goal is to modify the UV-vis absorption properties and the oxidation potential of metallic surfaces with a [Ru]-DTE-[Ru]-S type complex (S represents a thiol function). The electron transport kinetics between a surface and a redox center is also expected to be modified by light through a DTE-[Ru]-S complex. Finally, the electrical conductivity of molecular junctions is expected to be photochenically and electrochemically modified with S-[Ru]-DTE-[Ru]-S and S-[Ru]-DTE-[Ru]-DTE-[Ru]-S complexes.
