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Formation of (PPy)FeIII-(O2•-) (2) via oxygenation of (PPy)FeII (1) and subsequent reaction with [CuI(AN)]+ to give the meta-stable intermediate, the high-spin heme-peroxo-copper complex (3a), which decays to give the m-oxo complex [(PPy)FeIII-(O2-)- CuII(AN)]+ (3)
