Figure 5: Interaction of [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] catalyst with chitosan.

(a) The absorption spectra of [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] catalyst (3.00 × 10⁻⁷ mol) in water at pH 4.5, an chitosan solution (1.0 g l⁻¹) in methanol/water (1:3, v-v) at pH 4.5 and [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] catalyst (3.00 × 10⁻⁷ mol) with continuous sonication of the chitosan solution (1.0 g l⁻¹) in methanol/water (1:3, v-v) at pH 4.5. (b) The absorption spectra of chitosan (1.0 g l⁻¹) with progressive addition of [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] (1.00 × 10⁻³ mol l⁻¹ in CH₂Cl₂) in methanol/water (1:3, v-v) at pH 4.5; inset: the absorbance at 336 nm as a function of amounts of [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] catalyst. (c) The schematic representation of dialysis experiment: the 10 ml solution inside the dialyser containing [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] catalyst (1.00 × 10⁻⁴ mol l⁻¹) in the absence (A) and presence (B) of chitosan (1.0 g l⁻¹) in methanol/water (1:3, v-v) at pH 4.5; the solution outside the dialyser containing 90 ml of methanol/water (1:3, v-v) at pH 4.5. (d) The time course of the concentration changes of [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] catalyst outside the solution of dialysis bag A and dialysis bag B, respectively, which was read from UV–vis absorption spectra. (e) Cyclic voltammograms of [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] catalyst (2.0 × 10⁻⁴ mol l⁻¹) in the absence and presence of HOAc in methanol/water (1:1, v-v). (f) Cyclic voltammograms of [Fe₂(CO)₆(μ-adt)CH₂C₆H₅] catalyst (2.0 × 10⁻⁴ mol l⁻¹) in the absence and presence of HOAc in methanol/water (1:1, v-v) with chitosan (1.0 g l⁻¹).