Fig. 6.

Formation and decay of the μ-η²:η²-peroxodicopper(II) complex [Cu^II₂(N3)(O₂²⁻)]²⁺ (λ_max = 490 nm) in the reaction of [Cu^I₂(N3)]²⁺ (0.10 mM) with O₂ in the presence of Fc* (0.80 mM) in acetone at 193 K. The inset shows the time profiles of the absorbance at 490 nm (black circles) and 780 nm (red circles) due to [Cu^II₂(N3)(O₂²⁻)]²⁺ and Fc*⁺, respectively. Adapted from reference 67.