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A Novel 2,2′-Bipyridine[2]catenane and Its Ruthenium Complex: Synthesis, Structure, and Intramolecular Electron Transfer— A Model for the Photosynthetic Reaction Center
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1999
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EngineeringInorganic PhotochemistrySynthetic PhotochemistryChemistryBiexponential DecayChemical EngineeringPhotoredox ProcessRuthenium ComplexPhotocatalysisInorganic ChemistryBiochemistryPhotochemistryMechanistic PhotochemistrySupramolecular PhotochemistryCatenane StructureNatural SciencesCoordination ComplexMolecular ComplexPhotosynthetic Reaction Center
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.