Département de chimie moléculaire

Sol. homo- and heterometallic coordination polymers contg. transition metal cations (Cu2+, Fe2+, Co2+, and Ni2+ ions) were prepd. in a two-step procedure using a polytopic bis(terpyridine)dioxocyclam ligand 1H2 (dioxocyclam = 1,4,8,11-tetraazacyclotetradecane-5,7-dione). These supramol. systems incorporate two different metal complexes, the metal cations being located both between two terpyridine units and in the macrocyclic framework. The characterization of these sol. architectures was investigated by cyclic voltammetry, mass spectrometry, viscosimetry, and UV-vis absorption and ESR (EPR) spectroscopies. Our results clearly indicate the formation of well-organized heterometallic polymers in which two different metal ions alternate in the self-assembled structure. These investigations furthermore brought to light an original acid-controlled disassembling process of the homometallic copper(II) polymer into dinuclear complexes. [on SciFinder(R)]