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Synthesis and charge delocalization property of multimetallic molecular wires with diethynylthiophene bridges


Here we report properties of thiophene-rich, acetylide-type mono-, di- and tri-nuclear ruthenium molecular wires 1–4, which are prepared by rationally designed coupling of vinylidene intermediates. Electrochemical analysis of 1–3 reveals fully reversible redox waves, the numbers of which are equal to those of the ruthenium fragments. Spectroelectrochemical analysis of 2 and 3 reveals the clear step-by-step oxidation processes. Analysis of NIR absorption bands reveals that the monocationic species 2+ and 3+ are highly charge-delocalized species, which are further supported by DFT and TD-DFT calculations of their model complexes.