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UV-vis spectra of (a) neutral ReV(O)(TBP8Cz) (green), meso-N-protonated [ReV(O)(TBP8Cz)(H)]+ (red), and meso-N-methylated 1 (blue) in CH2Cl2. (b) UV-vis spectral changes upon addition of excess HBArF to 1 (blue) in CH2Cl2 to form dicationic 2 (red).
