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. Author manuscript; available in PMC: 2016 Mar 11.
Published in final edited form as: J Am Chem Soc. 2015 Feb 26;137(9):3330–3337. doi: 10.1021/ja512584r

Figure 1.

Figure 1

(a) UV-vis spectral changes observed in the two-electron and four-electron reduction of O2 (0.5 mM) by Fc* (2.0 mM) with Sc(OTf)3 (2.0 mM) catalyzed by 1 (40 μM) in acetone at 298 K. (b) Time courses of absorbance at 780 nm due to Fc*+ in the two-electron and four-electron reduction of O2 (0.5 mM) by Fc* (2.0 mM) catalyzed by 1 (40 μM) in the presence of Sc(OTf)3 (2.0 mM) and HOTf (40 mM), respectively.