American Chemical Society
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Upconversion in a d–f [RuYb3] Supramolecular Assembly

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journal contribution
posted on 2022-06-30, 16:04 authored by Richard C. Knighton, Lohona K. Soro, Waygen Thor, Jean-Marc Strub, Sarah Cianférani, Yves Mély, Marc Lenertz, Ka-Leung Wong, Carlos Platas-Iglesias, Frédéric Przybilla, Loïc J. Charbonnière
We have prepared a hetero-tetrametallic assembly consisting of three ytterbium ions coordinated to a central [Ru­(bpm)3]2+ (bpm = 2,2′-bipyrimidine) motif. Irradiation into the absorption band of the peripheral ytterbium ions at 980 nm engenders emission of the 3MLCT state of the central [Ru­(bpm)3]2+ core at 636 nm, which represents the first example of f → d molecular upconversion (UC). Time-resolved measurements reveal a slow rise of the UC emission, which was modeled with a mathematical treatment of the observed kinetics according to a cooperative photosensitization mechanism using a virtual Yb centered doubly excited state followed by energy transfer to the Ru centered 1MLCT state.