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Formation of the η2:η2-peroxo complex 3 (λmax = 490 nm) in the reaction of [CuI2(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 3 and Fc*+, respectively.
