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EPR spectra of frozen solutions of [Fe(AH1−H)(AH1−2H)] (200 μM) in DMSO/water (70/30% v/v) at various pH values. The spectra corresponding to three distinct low-spin Fe(III) species are indicated as complexes I, II, and III. The spectra of mixtures are shown in grey. Experimental conditions: mw frequency, 9.444 GHz; mw power, 2 mW; magnetic field modulation amplitude, 0.2 mT; temperature, 77 K.
