Département de chimie moléculaire

The authors report herein the synthesis and characterization of four new bisterpyridine dinuclear ruthenium complexes contg. the dimethyldihydropyrene (DHP) photochrome as bridging ligand. A synthetic strategy has been developed based on a Suzuki coupling reaction to synthesize these novel terpyridine-DHPs. The reactivity of these different ligands and dinuclear ruthenium complexes with light was examd. by 1H NMR and monitoring the changes in their absorption spectra upon irradn. at controlled wavelengths. The free ligands and their corresponding ruthenium complexes all displayed photochromic properties with highly efficient conversion between the closed stable isomers (DHP) and their open forms (CPD). The properties of the compds. in their closed and open forms were studied by cyclic voltammetry, spectroscopy, and luminescence measurements. [on SciFinder(R)]