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Photochemical Upconversion: Anthracene Dimerization Sensitized to Visible Light by a RuII Chromophore


  • F.N.C. gratefully acknowledges financial support from the US Air Force Office of Scientific Research (FA9550-05-1-0276), the US National Science Foundation (CAREER Award CHE-0134782), the American Chemical Society (44138-AC3), and the BGSU Technologies Innovations Enhancement Program.


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Double up: Photochemical upconversion by MLCT-sensitized triplet–triplet annihilation is demonstrated (MLCT=metal-to-ligand charge transfer). Selective visible excitation of [Ru(dmb)3]2+ (dmb=4,4′-dimethyl-2,2′-bipyridine) in the presence of anthracene efficiently produces the [4+4] cycloaddition product. This transformation traditionally requires ultraviolet light.