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a) UV/Vis spectra of 1 (black), 2 (red), 3 (blue), and 4 (green). Inset: the conversion of 3 (blue) into 4 (green) in CH3CN at 0 8C. b) ESI mass spectrum of 2. Insets: the observed isotope distribution patterns for [Co(15-TMC)(O2)]+ at m/z 361.1 (bottom panel) and [Co(15-TMC)-(18O2)]+ at m/z 365.1 (top panel).
