Figure 4. Reactivity of 2 in intermetal OAT.

Ultraviolet–visible spectral changes observed in the oxygen atom transfer from 2 to [(14-TMC)Fe^II]²⁺, showing the formation of [(14-TMC)Fe^IV(O)]²⁺ (blue line) upon addition of [(14-TMC)Fe^II]²⁺ (10 equiv.; 10 mM) to a solution of 2 (1.0 mM; red line) in the presence of HOTf (1.2 equiv.) in acetone at −40 °C. The inset shows the time courses monitored at 625 nm for the decay of 2 (red circles) and at 820 nm for the formation of [(TMC)Fe^IV(O)]²⁺ (blue circles).