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UV-vis changes accompanying oxygenation of (left) (4)Cu(CH3CN) and (right) (5)Cu(CH3CN) at −80 °C in THF, using starting concentrations of 0.2 mM or 0.1 mM, respectively. The initial and final spectra are in blue and red, respectively. The insets show the results of spectrophotometric titrations of the complexes with O2 as linear fits to (left) data for two replicate runs or (right) average data from three replicate runs.
