Fig. 4. (a) Normalized intensity (I; upper panel) and wavelength (λp; middle panel) at the peak of the FeCl4 band, and variation (ΔV; bottom panel) in V of Fe2+/Fe3+ in MeOH solution against [Cl−]. The intensity was normalized by the value at [Cl−] = 101.5 mM. (b) I (upper panel) and λp (middle penal), and ΔV (bottom panel) in EtOH solution against [Cl−]. The intensity was normalized by the value at [Cl−] = 7.5 mM. For convenience of explanation, regions I, II, and III are defined (see text).
