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Time courses of absorbance at 780 nm due to Fc*+ in the two-electron reduction of O2 (11 mM) by Fc* (2.0 mM) with metal triflates [Sc(OTf)3, Yb(OTf)3, Y(OTf)3, Lu(OTf)3, Mg(OTf)2, and Ca(OTf)2] (2.0 mM) catalyzed by 1 (40 μM) in acetone at 298 K.
