Key points are not available for this paper at this time.
We have prepared a hetero-tetrametallic assembly consisting of three ytterbium ions coordinated to a central Ru(bpm)32+ (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)32+ 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.
Knighton et al. (Thu,) studied this question.