Fig. 4.
1H NMR spectra in DMF-d7 of the aromatic region of a) the reaction of FeIII(O2•−)(TPP) and 2,3-dimethylindole at −40 °C, b) after warm-up to 25 °C, and c) a mixture of independently synthesized (FeIIITPP)2(μ-O) and 2,3-dimethylindole at −40 °C.