Figure 8.

Time-dependent UV-visible spectra for the oxygenation of [(L^EIm)Cu^I]⁺ (2a) in THF at −90 °C as measured using a stopped-flow kinetics instrument. The Inset shows the time dependence of the disappearance of the superoxo complex [(L^EIm)Cu^II(O₂^·−)]⁺ (2b^S) (431 nm) and the corresponding formation of the peroxo complex [{(L^EIm)Cu^II}₂(O₂²⁻)]²⁺ (2b^P) monitored at 535 nm. See text for further explanation and discussion.