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(a) Change of absorption spectra of a sample containing 0.5 mM [Fe(CN)6]3− and 0.5 M of pyrrole at different incubation periods; (b) evolution of absorption at 420 nm vs. incubation time in a solution consisting of 0.5 M of pyrrole with either 0.5 mM of [Fe(CN)6]3− or 0.5 mM of [Fe(CN)6]4− at pH 7.0, under aerobic and anaerobic conditions. Linear regression from t = 20 min was observed with R2 = 0.9933; 0 min*, spectra registered before the addition of Py into reaction mixture.
