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(A) Overall scheme for reactivity of [(PImH)FeIICuI]+ (3) toward O2(g) at −80 °C in THF to yield a HS peroxo species [(PImH)FeIII−(O22−)−CuII]+ (3a) and LS peroxo complex [(DCHIm)(PImH)FeIII−(O22−)−CuII]+ (3b) following addition of DCHIm. (B) UV–vis spectra (−80 °C) for in situ generated HS 3a (red) and LS 3b (blue) starting following oxygenation of 3 (black).
