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(a) UV-visible spectra of the hydroperoxo species [CuII(tepa)(OOH)+ (3) (0.23 mM) (black line) and 3 (0.23 mM) plus excess Me2Fc (1.5 mM) (red line) to in acetone at 193 K. (b) UV-visible spectral changes of 3 (0.23 mM) in the presence of HClO4 (40 mM) in acetone at 193 K. Inset shows the time profile of the absorbance at 345 nm due to 3.
