Figure 4.

(A) Cyclic voltammograms of the [NaP₅W₃₀O₁₁₀]¹⁴⁻ anion (1 mmol·L⁻¹, glassy carbon working electrode, scan rate 200 mV·s⁻¹) in the presence of increasing amounts of γ-CD (from 0 to 30 equivalents). The experiments have been performed in 50:50 (v:v) HCl (0.1 mol·L⁻¹):NaCl (0.9 mol·L⁻¹) aqueous solution (pH = 1.3). (B) Plot of the variation of the first (red filled diamond-shaped symbol) and the second (blue filled circle symbol) cathodic peaks extrema versus equivalent number of γ-CD showing a break point at ca. 5 eq. CD (j₀ = cathodic peak current density of [NaP₅W₃₀O₁₁₀]¹⁴⁻ anion without γ-CD).