The complexation of a novel [2]catenane incorporating 2,2′-bipyridine and cyclobis(paraquat-p-phenylene) within a ruthenium complex afforded a catenane-type artificial-photosynthesis assembly. Studies by X-ray analysis, molecular modeling (MM2), NMR, and cyclic voltammetry revealed the catenane structure and indicated conformers with different sensitizer–acceptor distances. Emission studies and laser flash photolysis confirmed the occurrence of efficient photoinduced electron transfer between the noncovalently linked sensitizer (Ru2+ center) and the acceptor (bisviologen), as depicted. Biexponential decay with long-lived charge-separated states was observed.
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Hu et al. (1999) studied this question.
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